diff --git a/packages/google-ads-admanager/google/ads/admanager_v1/services/ad_partner_service/transports/base.py b/packages/google-ads-admanager/google/ads/admanager_v1/services/ad_partner_service/transports/base.py
index d53960730074..40679501a417 100644
--- a/packages/google-ads-admanager/google/ads/admanager_v1/services/ad_partner_service/transports/base.py
+++ b/packages/google-ads-admanager/google/ads/admanager_v1/services/ad_partner_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ads-admanager/google/ads/admanager_v1/services/ad_unit_service/transports/base.py b/packages/google-ads-admanager/google/ads/admanager_v1/services/ad_unit_service/transports/base.py
index 2e90bfc0cbe6..948cad87abb1 100644
--- a/packages/google-ads-admanager/google/ads/admanager_v1/services/ad_unit_service/transports/base.py
+++ b/packages/google-ads-admanager/google/ads/admanager_v1/services/ad_unit_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ads-admanager/google/ads/admanager_v1/services/company_service/transports/base.py b/packages/google-ads-admanager/google/ads/admanager_v1/services/company_service/transports/base.py
index 1302dd6d0d33..0415f3d70be7 100644
--- a/packages/google-ads-admanager/google/ads/admanager_v1/services/company_service/transports/base.py
+++ b/packages/google-ads-admanager/google/ads/admanager_v1/services/company_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ads-admanager/google/ads/admanager_v1/services/contact_service/transports/base.py b/packages/google-ads-admanager/google/ads/admanager_v1/services/contact_service/transports/base.py
index e98242f0d21a..c6cbbecff076 100644
--- a/packages/google-ads-admanager/google/ads/admanager_v1/services/contact_service/transports/base.py
+++ b/packages/google-ads-admanager/google/ads/admanager_v1/services/contact_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ads-admanager/google/ads/admanager_v1/services/creative_service/transports/base.py b/packages/google-ads-admanager/google/ads/admanager_v1/services/creative_service/transports/base.py
index bc77ffa8be6b..4085651854f9 100644
--- a/packages/google-ads-admanager/google/ads/admanager_v1/services/creative_service/transports/base.py
+++ b/packages/google-ads-admanager/google/ads/admanager_v1/services/creative_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ads-admanager/google/ads/admanager_v1/services/custom_field_service/transports/base.py b/packages/google-ads-admanager/google/ads/admanager_v1/services/custom_field_service/transports/base.py
index 7ce35c377999..3578065cdf3f 100644
--- a/packages/google-ads-admanager/google/ads/admanager_v1/services/custom_field_service/transports/base.py
+++ b/packages/google-ads-admanager/google/ads/admanager_v1/services/custom_field_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ads-admanager/google/ads/admanager_v1/services/custom_targeting_key_service/transports/base.py b/packages/google-ads-admanager/google/ads/admanager_v1/services/custom_targeting_key_service/transports/base.py
index 4e56c181ba4f..a55f7a97d634 100644
--- a/packages/google-ads-admanager/google/ads/admanager_v1/services/custom_targeting_key_service/transports/base.py
+++ b/packages/google-ads-admanager/google/ads/admanager_v1/services/custom_targeting_key_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ads-admanager/google/ads/admanager_v1/services/custom_targeting_value_service/transports/base.py b/packages/google-ads-admanager/google/ads/admanager_v1/services/custom_targeting_value_service/transports/base.py
index 0c295f68d9b8..a9d002f465f7 100644
--- a/packages/google-ads-admanager/google/ads/admanager_v1/services/custom_targeting_value_service/transports/base.py
+++ b/packages/google-ads-admanager/google/ads/admanager_v1/services/custom_targeting_value_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ads-admanager/google/ads/admanager_v1/services/label_service/transports/base.py b/packages/google-ads-admanager/google/ads/admanager_v1/services/label_service/transports/base.py
index d4ada389a59d..48a3880b9b11 100644
--- a/packages/google-ads-admanager/google/ads/admanager_v1/services/label_service/transports/base.py
+++ b/packages/google-ads-admanager/google/ads/admanager_v1/services/label_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ads-admanager/google/ads/admanager_v1/services/line_item_service/transports/base.py b/packages/google-ads-admanager/google/ads/admanager_v1/services/line_item_service/transports/base.py
index f416c6575f7a..c893d9789ad1 100644
--- a/packages/google-ads-admanager/google/ads/admanager_v1/services/line_item_service/transports/base.py
+++ b/packages/google-ads-admanager/google/ads/admanager_v1/services/line_item_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ads-admanager/google/ads/admanager_v1/services/network_service/transports/base.py b/packages/google-ads-admanager/google/ads/admanager_v1/services/network_service/transports/base.py
index 94f55de37fcc..ae9d00df7932 100644
--- a/packages/google-ads-admanager/google/ads/admanager_v1/services/network_service/transports/base.py
+++ b/packages/google-ads-admanager/google/ads/admanager_v1/services/network_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ads-admanager/google/ads/admanager_v1/services/order_service/transports/base.py b/packages/google-ads-admanager/google/ads/admanager_v1/services/order_service/transports/base.py
index ca898edbaf03..1c19f3691180 100644
--- a/packages/google-ads-admanager/google/ads/admanager_v1/services/order_service/transports/base.py
+++ b/packages/google-ads-admanager/google/ads/admanager_v1/services/order_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ads-admanager/google/ads/admanager_v1/services/placement_service/transports/base.py b/packages/google-ads-admanager/google/ads/admanager_v1/services/placement_service/transports/base.py
index a97b28e6fd07..0012313340aa 100644
--- a/packages/google-ads-admanager/google/ads/admanager_v1/services/placement_service/transports/base.py
+++ b/packages/google-ads-admanager/google/ads/admanager_v1/services/placement_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ads-admanager/google/ads/admanager_v1/services/report_service/transports/base.py b/packages/google-ads-admanager/google/ads/admanager_v1/services/report_service/transports/base.py
index e174dfcdb99c..fe244f5d7b89 100644
--- a/packages/google-ads-admanager/google/ads/admanager_v1/services/report_service/transports/base.py
+++ b/packages/google-ads-admanager/google/ads/admanager_v1/services/report_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ads-admanager/google/ads/admanager_v1/services/role_service/transports/base.py b/packages/google-ads-admanager/google/ads/admanager_v1/services/role_service/transports/base.py
index 31f17c80d91a..c90135acb761 100644
--- a/packages/google-ads-admanager/google/ads/admanager_v1/services/role_service/transports/base.py
+++ b/packages/google-ads-admanager/google/ads/admanager_v1/services/role_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ads-admanager/google/ads/admanager_v1/services/team_service/transports/base.py b/packages/google-ads-admanager/google/ads/admanager_v1/services/team_service/transports/base.py
index 49c9ebf40870..ecd6400675e7 100644
--- a/packages/google-ads-admanager/google/ads/admanager_v1/services/team_service/transports/base.py
+++ b/packages/google-ads-admanager/google/ads/admanager_v1/services/team_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ads-admanager/google/ads/admanager_v1/services/user_service/transports/base.py b/packages/google-ads-admanager/google/ads/admanager_v1/services/user_service/transports/base.py
index 50b1421abe40..1212bbbf1c14 100644
--- a/packages/google-ads-admanager/google/ads/admanager_v1/services/user_service/transports/base.py
+++ b/packages/google-ads-admanager/google/ads/admanager_v1/services/user_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ads-admanager/noxfile.py b/packages/google-ads-admanager/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-ads-admanager/noxfile.py
+++ b/packages/google-ads-admanager/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-ads-admanager/setup.py b/packages/google-ads-admanager/setup.py
index 823dba823033..228f5f544b6e 100644
--- a/packages/google-ads-admanager/setup.py
+++ b/packages/google-ads-admanager/setup.py
@@ -44,7 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-ads-admanager"
 
diff --git a/packages/google-ads-admanager/testing/constraints-3.7.txt b/packages/google-ads-admanager/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-ads-admanager/testing/constraints-3.7.txt
+++ b/packages/google-ads-admanager/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage/gapic_version.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage/gapic_version.py
index 1a1d9a4de546..558c8aab67c5 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage/gapic_version.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "0.6.6"  # {x-release-please-version}
+__version__ = "0.0.0"  # {x-release-please-version}
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/gapic_version.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/gapic_version.py
index 1a1d9a4de546..558c8aab67c5 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/gapic_version.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "0.6.6"  # {x-release-please-version}
+__version__ = "0.0.0"  # {x-release-please-version}
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/generative_service/transports/base.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/generative_service/transports/base.py
index 42aababa203f..abeea58922da 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/generative_service/transports/base.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/generative_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/generative_service/transports/grpc.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/generative_service/transports/grpc.py
index bf48bd2a84b0..7fa405324e45 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/generative_service/transports/grpc.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/generative_service/transports/grpc.py
@@ -123,7 +123,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/generative_service/transports/grpc_asyncio.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/generative_service/transports/grpc_asyncio.py
index 717d2ec4f14c..bc85a9437627 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/generative_service/transports/grpc_asyncio.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/generative_service/transports/grpc_asyncio.py
@@ -170,7 +170,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/model_service/transports/base.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/model_service/transports/base.py
index d944bdfeff44..e5f94923d354 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/model_service/transports/base.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/model_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/model_service/transports/grpc.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/model_service/transports/grpc.py
index deae6609c7dc..cd57836b737c 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/model_service/transports/grpc.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/model_service/transports/grpc.py
@@ -123,7 +123,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/model_service/transports/grpc_asyncio.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/model_service/transports/grpc_asyncio.py
index 7762fee63c5e..f1569dd307a5 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/model_service/transports/grpc_asyncio.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1/services/model_service/transports/grpc_asyncio.py
@@ -170,7 +170,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/gapic_version.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/gapic_version.py
index 1a1d9a4de546..558c8aab67c5 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/gapic_version.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "0.6.6"  # {x-release-please-version}
+__version__ = "0.0.0"  # {x-release-please-version}
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/cache_service/transports/base.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/cache_service/transports/base.py
index 3e4f6ea5bb4b..07806b2ce8c6 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/cache_service/transports/base.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/cache_service/transports/base.py
@@ -87,6 +87,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -99,7 +101,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/cache_service/transports/grpc.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/cache_service/transports/grpc.py
index 2f3c6572bc62..474a90f1885e 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/cache_service/transports/grpc.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/cache_service/transports/grpc.py
@@ -131,7 +131,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/cache_service/transports/grpc_asyncio.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/cache_service/transports/grpc_asyncio.py
index 931c69f90d0b..5780db3fa4a8 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/cache_service/transports/grpc_asyncio.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/cache_service/transports/grpc_asyncio.py
@@ -178,7 +178,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/discuss_service/transports/base.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/discuss_service/transports/base.py
index c6ca1f7644c4..31a9d3aa2ea4 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/discuss_service/transports/base.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/discuss_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/discuss_service/transports/grpc.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/discuss_service/transports/grpc.py
index 7b928a52c840..f8404e812107 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/discuss_service/transports/grpc.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/discuss_service/transports/grpc.py
@@ -125,7 +125,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/discuss_service/transports/grpc_asyncio.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/discuss_service/transports/grpc_asyncio.py
index a7edf010e7ec..4058b7306aa8 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/discuss_service/transports/grpc_asyncio.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/discuss_service/transports/grpc_asyncio.py
@@ -172,7 +172,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/file_service/transports/base.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/file_service/transports/base.py
index 354224b4a463..53e284ef04f5 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/file_service/transports/base.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/file_service/transports/base.py
@@ -83,6 +83,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -95,7 +97,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/file_service/transports/grpc.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/file_service/transports/grpc.py
index 1a451f7af558..54f12360160f 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/file_service/transports/grpc.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/file_service/transports/grpc.py
@@ -123,7 +123,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/file_service/transports/grpc_asyncio.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/file_service/transports/grpc_asyncio.py
index 492c744a8562..8dbbf3a5abbb 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/file_service/transports/grpc_asyncio.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/file_service/transports/grpc_asyncio.py
@@ -170,7 +170,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/generative_service/transports/base.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/generative_service/transports/base.py
index da37ba9527bd..02ccb4968ea4 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/generative_service/transports/base.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/generative_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/generative_service/transports/grpc.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/generative_service/transports/grpc.py
index 960bcd048184..1a4ef014a66e 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/generative_service/transports/grpc.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/generative_service/transports/grpc.py
@@ -123,7 +123,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/generative_service/transports/grpc_asyncio.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/generative_service/transports/grpc_asyncio.py
index 6c885a4515b4..d175309053ed 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/generative_service/transports/grpc_asyncio.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/generative_service/transports/grpc_asyncio.py
@@ -170,7 +170,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/model_service/transports/base.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/model_service/transports/base.py
index 047d97ae00b5..65214591a5d0 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/model_service/transports/base.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/model_service/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/model_service/transports/grpc.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/model_service/transports/grpc.py
index 8b90c33270bb..0649fc878074 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/model_service/transports/grpc.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/model_service/transports/grpc.py
@@ -127,7 +127,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/model_service/transports/grpc_asyncio.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/model_service/transports/grpc_asyncio.py
index 5cf218c92e13..bfce8ab6172a 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/model_service/transports/grpc_asyncio.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/model_service/transports/grpc_asyncio.py
@@ -174,7 +174,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/permission_service/transports/base.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/permission_service/transports/base.py
index 06a3add9de43..0bee9c53d94a 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/permission_service/transports/base.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/permission_service/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/permission_service/transports/grpc.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/permission_service/transports/grpc.py
index 8c798fa50fc7..b50d5971cf13 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/permission_service/transports/grpc.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/permission_service/transports/grpc.py
@@ -126,7 +126,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/permission_service/transports/grpc_asyncio.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/permission_service/transports/grpc_asyncio.py
index 726dd35ff0f1..04c55331107b 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/permission_service/transports/grpc_asyncio.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/permission_service/transports/grpc_asyncio.py
@@ -173,7 +173,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/retriever_service/transports/base.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/retriever_service/transports/base.py
index a8e5222ad0ec..f13761fae272 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/retriever_service/transports/base.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/retriever_service/transports/base.py
@@ -83,6 +83,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -95,7 +97,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/retriever_service/transports/grpc.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/retriever_service/transports/grpc.py
index 1d357b5607bf..67e56521f181 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/retriever_service/transports/grpc.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/retriever_service/transports/grpc.py
@@ -124,7 +124,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/retriever_service/transports/grpc_asyncio.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/retriever_service/transports/grpc_asyncio.py
index 0e86fdac5a85..6591efdffbb9 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/retriever_service/transports/grpc_asyncio.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/retriever_service/transports/grpc_asyncio.py
@@ -171,7 +171,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/text_service/transports/base.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/text_service/transports/base.py
index 5353b2cc87ff..275cad931b29 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/text_service/transports/base.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/text_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/text_service/transports/grpc.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/text_service/transports/grpc.py
index c148cea481a2..1a62271d6c5e 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/text_service/transports/grpc.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/text_service/transports/grpc.py
@@ -125,7 +125,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/text_service/transports/grpc_asyncio.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/text_service/transports/grpc_asyncio.py
index 41e016a225ab..7848cb093f27 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/text_service/transports/grpc_asyncio.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/services/text_service/transports/grpc_asyncio.py
@@ -172,7 +172,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/types/retriever.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/types/retriever.py
index 0e9dbd2bf822..077f63436991 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/types/retriever.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta/types/retriever.py
@@ -88,7 +88,7 @@ class Document(proto.Message):
     Attributes:
         name (str):
             Immutable. Identifier. The ``Document`` resource name. The
-            ID (name excluding the `corpora/*/documents/` prefix) can
+            ID (name excluding the "corpora/*/documents/" prefix) can
             contain up to 40 characters that are lowercase alphanumeric
             or dashes (-). The ID cannot start or end with a dash. If
             the name is empty on create, a unique name will be derived
@@ -315,7 +315,7 @@ class Chunk(proto.Message):
     Attributes:
         name (str):
             Immutable. Identifier. The ``Chunk`` resource name. The ID
-            (name excluding the `corpora/*/documents/*/chunks/` prefix)
+            (name excluding the "corpora/*/documents/*/chunks/" prefix)
             can contain up to 40 characters that are lowercase
             alphanumeric or dashes (-). The ID cannot start or end with
             a dash. If the name is empty on create, a random
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/gapic_version.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/gapic_version.py
index 1a1d9a4de546..558c8aab67c5 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/gapic_version.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "0.6.6"  # {x-release-please-version}
+__version__ = "0.0.0"  # {x-release-please-version}
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/discuss_service/transports/base.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/discuss_service/transports/base.py
index c34190eb8224..4ca8cf614f8d 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/discuss_service/transports/base.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/discuss_service/transports/base.py
@@ -81,6 +81,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -93,7 +95,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/discuss_service/transports/grpc.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/discuss_service/transports/grpc.py
index 6f845a7d880b..071541b8da85 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/discuss_service/transports/grpc.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/discuss_service/transports/grpc.py
@@ -124,7 +124,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/discuss_service/transports/grpc_asyncio.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/discuss_service/transports/grpc_asyncio.py
index 0ddb079ec2d1..6d3b84b9f907 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/discuss_service/transports/grpc_asyncio.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/discuss_service/transports/grpc_asyncio.py
@@ -171,7 +171,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/model_service/transports/base.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/model_service/transports/base.py
index 28f565253be1..023c06841426 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/model_service/transports/base.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/model_service/transports/base.py
@@ -81,6 +81,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -93,7 +95,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/model_service/transports/grpc.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/model_service/transports/grpc.py
index bb0de1936b48..231167a74c9e 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/model_service/transports/grpc.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/model_service/transports/grpc.py
@@ -122,7 +122,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/model_service/transports/grpc_asyncio.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/model_service/transports/grpc_asyncio.py
index 98858078c93d..c54748b7f5e6 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/model_service/transports/grpc_asyncio.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/model_service/transports/grpc_asyncio.py
@@ -169,7 +169,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/text_service/transports/base.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/text_service/transports/base.py
index 46fd55e29a7f..1859606eb4d4 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/text_service/transports/base.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/text_service/transports/base.py
@@ -81,6 +81,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -93,7 +95,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/text_service/transports/grpc.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/text_service/transports/grpc.py
index 618fa7fcf57d..fc4c7ba64f24 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/text_service/transports/grpc.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/text_service/transports/grpc.py
@@ -124,7 +124,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/text_service/transports/grpc_asyncio.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/text_service/transports/grpc_asyncio.py
index bcf1de989d52..9258f863fde4 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/text_service/transports/grpc_asyncio.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta2/services/text_service/transports/grpc_asyncio.py
@@ -171,7 +171,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/gapic_version.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/gapic_version.py
index 1a1d9a4de546..558c8aab67c5 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/gapic_version.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "0.6.6"  # {x-release-please-version}
+__version__ = "0.0.0"  # {x-release-please-version}
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/discuss_service/transports/base.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/discuss_service/transports/base.py
index 694c5be0fc06..f8fc4561020b 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/discuss_service/transports/base.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/discuss_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/discuss_service/transports/grpc.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/discuss_service/transports/grpc.py
index 9b477c84a00c..750e69de41c6 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/discuss_service/transports/grpc.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/discuss_service/transports/grpc.py
@@ -125,7 +125,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/discuss_service/transports/grpc_asyncio.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/discuss_service/transports/grpc_asyncio.py
index b35fca64c3c0..139075c5f42a 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/discuss_service/transports/grpc_asyncio.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/discuss_service/transports/grpc_asyncio.py
@@ -172,7 +172,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/model_service/transports/base.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/model_service/transports/base.py
index 1d0843789036..e58a338f6de4 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/model_service/transports/base.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/model_service/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/model_service/transports/grpc.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/model_service/transports/grpc.py
index 9d0531cd9ae6..5e91aaf1fb56 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/model_service/transports/grpc.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/model_service/transports/grpc.py
@@ -127,7 +127,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/model_service/transports/grpc_asyncio.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/model_service/transports/grpc_asyncio.py
index 7642f3129894..58f34665ea7a 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/model_service/transports/grpc_asyncio.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/model_service/transports/grpc_asyncio.py
@@ -174,7 +174,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/async_client.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/async_client.py
index a1b16cd3c582..90a8e1f14865 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/async_client.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/async_client.py
@@ -352,11 +352,11 @@ async def sample_create_permission():
                 role is a superset of the previous
                 role's permitted operations:
 
-                - reader can use the resource (e.g.
+                 - reader can use the resource (e.g.
                   tuned model) for inference
-                - writer has reader's permissions and
+                 - writer has reader's permissions and
                   additionally can edit and share
-                - owner has writer's permissions and
+                 - owner has writer's permissions and
                   additionally can delete
 
         """
@@ -483,11 +483,11 @@ async def sample_get_permission():
                 role is a superset of the previous
                 role's permitted operations:
 
-                - reader can use the resource (e.g.
+                 - reader can use the resource (e.g.
                   tuned model) for inference
-                - writer has reader's permissions and
+                 - writer has reader's permissions and
                   additionally can edit and share
-                - owner has writer's permissions and
+                 - owner has writer's permissions and
                   additionally can delete
 
         """
@@ -741,11 +741,11 @@ async def sample_update_permission():
                 role is a superset of the previous
                 role's permitted operations:
 
-                - reader can use the resource (e.g.
+                 - reader can use the resource (e.g.
                   tuned model) for inference
-                - writer has reader's permissions and
+                 - writer has reader's permissions and
                   additionally can edit and share
-                - owner has writer's permissions and
+                 - owner has writer's permissions and
                   additionally can delete
 
         """
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/client.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/client.py
index 6673d66ac4a8..03793b78428a 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/client.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/client.py
@@ -781,11 +781,11 @@ def sample_create_permission():
                 role is a superset of the previous
                 role's permitted operations:
 
-                - reader can use the resource (e.g.
+                 - reader can use the resource (e.g.
                   tuned model) for inference
-                - writer has reader's permissions and
+                 - writer has reader's permissions and
                   additionally can edit and share
-                - owner has writer's permissions and
+                 - owner has writer's permissions and
                   additionally can delete
 
         """
@@ -909,11 +909,11 @@ def sample_get_permission():
                 role is a superset of the previous
                 role's permitted operations:
 
-                - reader can use the resource (e.g.
+                 - reader can use the resource (e.g.
                   tuned model) for inference
-                - writer has reader's permissions and
+                 - writer has reader's permissions and
                   additionally can edit and share
-                - owner has writer's permissions and
+                 - owner has writer's permissions and
                   additionally can delete
 
         """
@@ -1161,11 +1161,11 @@ def sample_update_permission():
                 role is a superset of the previous
                 role's permitted operations:
 
-                - reader can use the resource (e.g.
+                 - reader can use the resource (e.g.
                   tuned model) for inference
-                - writer has reader's permissions and
+                 - writer has reader's permissions and
                   additionally can edit and share
-                - owner has writer's permissions and
+                 - owner has writer's permissions and
                   additionally can delete
 
         """
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/transports/base.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/transports/base.py
index 4580731a4625..f8e5df5c1212 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/transports/base.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/transports/grpc.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/transports/grpc.py
index 054e6ca619bb..1e9fb355ecc4 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/transports/grpc.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/transports/grpc.py
@@ -126,7 +126,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/transports/grpc_asyncio.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/transports/grpc_asyncio.py
index c741b357684b..3767a9113588 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/transports/grpc_asyncio.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/transports/grpc_asyncio.py
@@ -173,7 +173,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/transports/rest.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/transports/rest.py
index 41e23b173930..a96955194c9d 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/transports/rest.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/permission_service/transports/rest.py
@@ -395,11 +395,11 @@ def __call__(
                 role is a superset of the previous
                 role's permitted operations:
 
-                - reader can use the resource (e.g.
+                 - reader can use the resource (e.g.
                   tuned model) for inference
-                - writer has reader's permissions and
+                 - writer has reader's permissions and
                   additionally can edit and share
-                - owner has writer's permissions and
+                 - owner has writer's permissions and
                   additionally can delete
 
             """
@@ -588,11 +588,11 @@ def __call__(
                 role is a superset of the previous
                 role's permitted operations:
 
-                - reader can use the resource (e.g.
+                 - reader can use the resource (e.g.
                   tuned model) for inference
-                - writer has reader's permissions and
+                 - writer has reader's permissions and
                   additionally can edit and share
-                - owner has writer's permissions and
+                 - owner has writer's permissions and
                   additionally can delete
 
             """
@@ -882,11 +882,11 @@ def __call__(
                 role is a superset of the previous
                 role's permitted operations:
 
-                - reader can use the resource (e.g.
+                 - reader can use the resource (e.g.
                   tuned model) for inference
-                - writer has reader's permissions and
+                 - writer has reader's permissions and
                   additionally can edit and share
-                - owner has writer's permissions and
+                 - owner has writer's permissions and
                   additionally can delete
 
             """
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/text_service/transports/base.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/text_service/transports/base.py
index 75f6037743fc..a254d25876da 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/text_service/transports/base.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/text_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/text_service/transports/grpc.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/text_service/transports/grpc.py
index 5719fde78742..93be6e7f2784 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/text_service/transports/grpc.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/text_service/transports/grpc.py
@@ -125,7 +125,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/text_service/transports/grpc_asyncio.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/text_service/transports/grpc_asyncio.py
index c26e9d9440d1..b86012947fec 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/text_service/transports/grpc_asyncio.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/services/text_service/transports/grpc_asyncio.py
@@ -172,7 +172,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/types/permission.py b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/types/permission.py
index 7649ff93c3eb..ec4088ec5358 100644
--- a/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/types/permission.py
+++ b/packages/google-ai-generativelanguage/google/ai/generativelanguage_v1beta3/types/permission.py
@@ -41,10 +41,10 @@ class Permission(proto.Message):
     There are three concentric roles. Each role is a superset of the
     previous role's permitted operations:
 
-    - reader can use the resource (e.g. tuned model) for inference
-    - writer has reader's permissions and additionally can edit and
+     - reader can use the resource (e.g. tuned model) for inference
+     - writer has reader's permissions and additionally can edit and
       share
-    - owner has writer's permissions and additionally can delete
+     - owner has writer's permissions and additionally can delete
 
 
     .. _oneof: https://proto-plus-python.readthedocs.io/en/stable/fields.html#oneofs-mutually-exclusive-fields
diff --git a/packages/google-ai-generativelanguage/samples/generated_samples/snippet_metadata_google.ai.generativelanguage.v1.json b/packages/google-ai-generativelanguage/samples/generated_samples/snippet_metadata_google.ai.generativelanguage.v1.json
index 3b1eb2b9811d..d6c3fe4c5051 100644
--- a/packages/google-ai-generativelanguage/samples/generated_samples/snippet_metadata_google.ai.generativelanguage.v1.json
+++ b/packages/google-ai-generativelanguage/samples/generated_samples/snippet_metadata_google.ai.generativelanguage.v1.json
@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-ai-generativelanguage",
-    "version": "0.6.6"
+    "version": "0.1.0"
   },
   "snippets": [
     {
diff --git a/packages/google-ai-generativelanguage/samples/generated_samples/snippet_metadata_google.ai.generativelanguage.v1beta.json b/packages/google-ai-generativelanguage/samples/generated_samples/snippet_metadata_google.ai.generativelanguage.v1beta.json
index 0bf5b8649f4b..3a0ef31881fb 100644
--- a/packages/google-ai-generativelanguage/samples/generated_samples/snippet_metadata_google.ai.generativelanguage.v1beta.json
+++ b/packages/google-ai-generativelanguage/samples/generated_samples/snippet_metadata_google.ai.generativelanguage.v1beta.json
@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-ai-generativelanguage",
-    "version": "0.6.6"
+    "version": "0.1.0"
   },
   "snippets": [
     {
diff --git a/packages/google-ai-generativelanguage/samples/generated_samples/snippet_metadata_google.ai.generativelanguage.v1beta2.json b/packages/google-ai-generativelanguage/samples/generated_samples/snippet_metadata_google.ai.generativelanguage.v1beta2.json
index 3bdb3d57561c..5b7d0a0509b4 100644
--- a/packages/google-ai-generativelanguage/samples/generated_samples/snippet_metadata_google.ai.generativelanguage.v1beta2.json
+++ b/packages/google-ai-generativelanguage/samples/generated_samples/snippet_metadata_google.ai.generativelanguage.v1beta2.json
@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-ai-generativelanguage",
-    "version": "0.6.6"
+    "version": "0.1.0"
   },
   "snippets": [
     {
diff --git a/packages/google-ai-generativelanguage/samples/generated_samples/snippet_metadata_google.ai.generativelanguage.v1beta3.json b/packages/google-ai-generativelanguage/samples/generated_samples/snippet_metadata_google.ai.generativelanguage.v1beta3.json
index 7cbc8b24aef3..91de9e353f90 100644
--- a/packages/google-ai-generativelanguage/samples/generated_samples/snippet_metadata_google.ai.generativelanguage.v1beta3.json
+++ b/packages/google-ai-generativelanguage/samples/generated_samples/snippet_metadata_google.ai.generativelanguage.v1beta3.json
@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-ai-generativelanguage",
-    "version": "0.6.6"
+    "version": "0.1.0"
   },
   "snippets": [
     {
diff --git a/packages/google-ai-generativelanguage/setup.py b/packages/google-ai-generativelanguage/setup.py
index a331b83549e9..652ccb29c2b5 100644
--- a/packages/google-ai-generativelanguage/setup.py
+++ b/packages/google-ai-generativelanguage/setup.py
@@ -46,7 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-ai-generativelanguage"
 
diff --git a/packages/google-ai-generativelanguage/testing/constraints-3.7.txt b/packages/google-ai-generativelanguage/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-ai-generativelanguage/testing/constraints-3.7.txt
+++ b/packages/google-ai-generativelanguage/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1/test_generative_service.py b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1/test_generative_service.py
index e2af954292b9..d2e91cff6f3f 100644
--- a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1/test_generative_service.py
+++ b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1/test_generative_service.py
@@ -1317,12 +1317,7 @@ async def test_generate_content_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.generate_content
         ] = mock_object
@@ -1704,12 +1699,7 @@ async def test_stream_generate_content_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.stream_generate_content
         ] = mock_object
@@ -2089,12 +2079,7 @@ async def test_embed_content_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.embed_content
         ] = mock_object
@@ -2472,12 +2457,7 @@ async def test_batch_embed_contents_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_embed_contents
         ] = mock_object
@@ -2859,12 +2839,7 @@ async def test_count_tokens_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.count_tokens
         ] = mock_object
diff --git a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1/test_model_service.py b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1/test_model_service.py
index 77d033fb830d..6c25fb10ce71 100644
--- a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1/test_model_service.py
+++ b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1/test_model_service.py
@@ -1288,12 +1288,7 @@ async def test_get_model_async_use_cached_wrapped_rpc(transport: str = "grpc_asy
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_model
         ] = mock_object
@@ -1675,12 +1670,7 @@ async def test_list_models_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_models
         ] = mock_object
diff --git a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_cache_service.py b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_cache_service.py
index ff2e6c3ba723..109e6bceb036 100644
--- a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_cache_service.py
+++ b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_cache_service.py
@@ -1279,12 +1279,7 @@ async def test_list_cached_contents_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_cached_contents
         ] = mock_object
@@ -1718,12 +1713,7 @@ async def test_create_cached_content_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_cached_content
         ] = mock_object
@@ -2067,12 +2057,7 @@ async def test_get_cached_content_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_cached_content
         ] = mock_object
@@ -2465,12 +2450,7 @@ async def test_update_cached_content_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_cached_content
         ] = mock_object
@@ -2877,12 +2857,7 @@ async def test_delete_cached_content_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_cached_content
         ] = mock_object
diff --git a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_discuss_service.py b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_discuss_service.py
index 0ea6edbe9e88..8ff03f059575 100644
--- a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_discuss_service.py
+++ b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_discuss_service.py
@@ -1277,12 +1277,7 @@ async def test_generate_message_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.generate_message
         ] = mock_object
@@ -1697,12 +1692,7 @@ async def test_count_message_tokens_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.count_message_tokens
         ] = mock_object
diff --git a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_file_service.py b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_file_service.py
index 2ebbcdf08ec0..a732d8f62dbd 100644
--- a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_file_service.py
+++ b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_file_service.py
@@ -1239,12 +1239,7 @@ async def test_create_file_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_file
         ] = mock_object
@@ -1460,12 +1455,7 @@ async def test_list_files_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_files
         ] = mock_object
@@ -1889,12 +1879,7 @@ async def test_get_file_async_use_cached_wrapped_rpc(transport: str = "grpc_asyn
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_file
         ] = mock_object
@@ -2259,12 +2244,7 @@ async def test_delete_file_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_file
         ] = mock_object
diff --git a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_generative_service.py b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_generative_service.py
index 62d9f9022ac3..caf6c526f47c 100644
--- a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_generative_service.py
+++ b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_generative_service.py
@@ -1324,12 +1324,7 @@ async def test_generate_content_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.generate_content
         ] = mock_object
@@ -1701,12 +1696,7 @@ async def test_generate_answer_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.generate_answer
         ] = mock_object
@@ -2133,12 +2123,7 @@ async def test_stream_generate_content_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.stream_generate_content
         ] = mock_object
@@ -2518,12 +2503,7 @@ async def test_embed_content_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.embed_content
         ] = mock_object
@@ -2901,12 +2881,7 @@ async def test_batch_embed_contents_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_embed_contents
         ] = mock_object
@@ -3291,12 +3266,7 @@ async def test_count_tokens_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.count_tokens
         ] = mock_object
diff --git a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_model_service.py b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_model_service.py
index b3c21ee2f8d4..1fb67097dabf 100644
--- a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_model_service.py
+++ b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_model_service.py
@@ -1304,12 +1304,7 @@ async def test_get_model_async_use_cached_wrapped_rpc(transport: str = "grpc_asy
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_model
         ] = mock_object
@@ -1693,12 +1688,7 @@ async def test_list_models_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_models
         ] = mock_object
@@ -2217,12 +2207,7 @@ async def test_get_tuned_model_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_tuned_model
         ] = mock_object
@@ -2610,12 +2595,7 @@ async def test_list_tuned_models_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_tuned_models
         ] = mock_object
@@ -3140,12 +3120,7 @@ async def test_create_tuned_model_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_tuned_model
         ] = mock_object
@@ -3516,12 +3491,7 @@ async def test_update_tuned_model_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_tuned_model
         ] = mock_object
@@ -3946,12 +3916,7 @@ async def test_delete_tuned_model_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_tuned_model
         ] = mock_object
diff --git a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_permission_service.py b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_permission_service.py
index afa1e1f85b8e..970a58f58ef9 100644
--- a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_permission_service.py
+++ b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_permission_service.py
@@ -1341,12 +1341,7 @@ async def test_create_permission_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_permission
         ] = mock_object
@@ -1746,12 +1741,7 @@ async def test_get_permission_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_permission
         ] = mock_object
@@ -2126,12 +2116,7 @@ async def test_list_permissions_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_permissions
         ] = mock_object
@@ -2701,12 +2686,7 @@ async def test_update_permission_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_permission
         ] = mock_object
@@ -3100,12 +3080,7 @@ async def test_delete_permission_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_permission
         ] = mock_object
@@ -3480,12 +3455,7 @@ async def test_transfer_ownership_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.transfer_ownership
         ] = mock_object
diff --git a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_retriever_service.py b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_retriever_service.py
index 0837cef9f258..5065cb3e6eae 100644
--- a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_retriever_service.py
+++ b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_retriever_service.py
@@ -1312,12 +1312,7 @@ async def test_create_corpus_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_corpus
         ] = mock_object
@@ -1621,12 +1616,7 @@ async def test_get_corpus_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_corpus
         ] = mock_object
@@ -1987,12 +1977,7 @@ async def test_update_corpus_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_corpus
         ] = mock_object
@@ -2357,12 +2342,7 @@ async def test_delete_corpus_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_corpus
         ] = mock_object
@@ -2717,12 +2697,7 @@ async def test_list_corpora_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_corpora
         ] = mock_object
@@ -3127,12 +3102,7 @@ async def test_query_corpus_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.query_corpus
         ] = mock_object
@@ -3414,12 +3384,7 @@ async def test_create_document_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_document
         ] = mock_object
@@ -3795,12 +3760,7 @@ async def test_get_document_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_document
         ] = mock_object
@@ -4161,12 +4121,7 @@ async def test_update_document_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_document
         ] = mock_object
@@ -4532,12 +4487,7 @@ async def test_delete_document_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_document
         ] = mock_object
@@ -4895,12 +4845,7 @@ async def test_list_documents_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_documents
         ] = mock_object
@@ -5451,12 +5396,7 @@ async def test_query_document_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.query_document
         ] = mock_object
@@ -5738,12 +5678,7 @@ async def test_create_chunk_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_chunk
         ] = mock_object
@@ -6122,12 +6057,7 @@ async def test_batch_create_chunks_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_create_chunks
         ] = mock_object
@@ -6414,12 +6344,7 @@ async def test_get_chunk_async_use_cached_wrapped_rpc(transport: str = "grpc_asy
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_chunk
         ] = mock_object
@@ -6780,12 +6705,7 @@ async def test_update_chunk_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_chunk
         ] = mock_object
@@ -7164,12 +7084,7 @@ async def test_batch_update_chunks_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_update_chunks
         ] = mock_object
@@ -7448,12 +7363,7 @@ async def test_delete_chunk_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_chunk
         ] = mock_object
@@ -7813,12 +7723,7 @@ async def test_batch_delete_chunks_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_delete_chunks
         ] = mock_object
@@ -8102,12 +8007,7 @@ async def test_list_chunks_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_chunks
         ] = mock_object
diff --git a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_text_service.py b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_text_service.py
index da137aee1f6e..88e342f16cb9 100644
--- a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_text_service.py
+++ b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta/test_text_service.py
@@ -1238,12 +1238,7 @@ async def test_generate_text_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.generate_text
         ] = mock_object
@@ -1651,12 +1646,7 @@ async def test_embed_text_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.embed_text
         ] = mock_object
@@ -2024,12 +2014,7 @@ async def test_batch_embed_text_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_embed_text
         ] = mock_object
@@ -2410,12 +2395,7 @@ async def test_count_text_tokens_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.count_text_tokens
         ] = mock_object
diff --git a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta2/test_discuss_service.py b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta2/test_discuss_service.py
index 07aa23fad032..4d9b1a5d200a 100644
--- a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta2/test_discuss_service.py
+++ b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta2/test_discuss_service.py
@@ -1276,12 +1276,7 @@ async def test_generate_message_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.generate_message
         ] = mock_object
@@ -1696,12 +1691,7 @@ async def test_count_message_tokens_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.count_message_tokens
         ] = mock_object
diff --git a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta2/test_model_service.py b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta2/test_model_service.py
index c7150a72b9e8..75edbeb60cdf 100644
--- a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta2/test_model_service.py
+++ b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta2/test_model_service.py
@@ -1287,12 +1287,7 @@ async def test_get_model_async_use_cached_wrapped_rpc(transport: str = "grpc_asy
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_model
         ] = mock_object
@@ -1674,12 +1669,7 @@ async def test_list_models_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_models
         ] = mock_object
diff --git a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta2/test_text_service.py b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta2/test_text_service.py
index a5cc9e88be12..d169cf7b1575 100644
--- a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta2/test_text_service.py
+++ b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta2/test_text_service.py
@@ -1237,12 +1237,7 @@ async def test_generate_text_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.generate_text
         ] = mock_object
@@ -1650,12 +1645,7 @@ async def test_embed_text_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.embed_text
         ] = mock_object
diff --git a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta3/test_discuss_service.py b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta3/test_discuss_service.py
index 15b91f0d7bc5..2a336b7fe3bb 100644
--- a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta3/test_discuss_service.py
+++ b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta3/test_discuss_service.py
@@ -1277,12 +1277,7 @@ async def test_generate_message_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.generate_message
         ] = mock_object
@@ -1697,12 +1692,7 @@ async def test_count_message_tokens_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.count_message_tokens
         ] = mock_object
diff --git a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta3/test_model_service.py b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta3/test_model_service.py
index bfbda0cb5313..c9a5063b2a35 100644
--- a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta3/test_model_service.py
+++ b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta3/test_model_service.py
@@ -1301,12 +1301,7 @@ async def test_get_model_async_use_cached_wrapped_rpc(transport: str = "grpc_asy
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_model
         ] = mock_object
@@ -1688,12 +1683,7 @@ async def test_list_models_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_models
         ] = mock_object
@@ -2212,12 +2202,7 @@ async def test_get_tuned_model_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_tuned_model
         ] = mock_object
@@ -2603,12 +2588,7 @@ async def test_list_tuned_models_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_tuned_models
         ] = mock_object
@@ -3133,12 +3113,7 @@ async def test_create_tuned_model_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_tuned_model
         ] = mock_object
@@ -3509,12 +3484,7 @@ async def test_update_tuned_model_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_tuned_model
         ] = mock_object
@@ -3939,12 +3909,7 @@ async def test_delete_tuned_model_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_tuned_model
         ] = mock_object
diff --git a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta3/test_permission_service.py b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta3/test_permission_service.py
index 204f74a70968..542ab3526b31 100644
--- a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta3/test_permission_service.py
+++ b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta3/test_permission_service.py
@@ -1341,12 +1341,7 @@ async def test_create_permission_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_permission
         ] = mock_object
@@ -1746,12 +1741,7 @@ async def test_get_permission_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_permission
         ] = mock_object
@@ -2126,12 +2116,7 @@ async def test_list_permissions_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_permissions
         ] = mock_object
@@ -2701,12 +2686,7 @@ async def test_update_permission_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_permission
         ] = mock_object
@@ -3100,12 +3080,7 @@ async def test_delete_permission_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_permission
         ] = mock_object
@@ -3480,12 +3455,7 @@ async def test_transfer_ownership_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.transfer_ownership
         ] = mock_object
diff --git a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta3/test_text_service.py b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta3/test_text_service.py
index ff98e1a03642..d7a284f8036f 100644
--- a/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta3/test_text_service.py
+++ b/packages/google-ai-generativelanguage/tests/unit/gapic/generativelanguage_v1beta3/test_text_service.py
@@ -1238,12 +1238,7 @@ async def test_generate_text_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.generate_text
         ] = mock_object
@@ -1651,12 +1646,7 @@ async def test_embed_text_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.embed_text
         ] = mock_object
@@ -2024,12 +2014,7 @@ async def test_batch_embed_text_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_embed_text
         ] = mock_object
@@ -2410,12 +2395,7 @@ async def test_count_text_tokens_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.count_text_tokens
         ] = mock_object
diff --git a/packages/google-analytics-admin/google/analytics/admin_v1alpha/services/analytics_admin_service/transports/base.py b/packages/google-analytics-admin/google/analytics/admin_v1alpha/services/analytics_admin_service/transports/base.py
index 7e4977bfab07..9e0d10b2ba63 100644
--- a/packages/google-analytics-admin/google/analytics/admin_v1alpha/services/analytics_admin_service/transports/base.py
+++ b/packages/google-analytics-admin/google/analytics/admin_v1alpha/services/analytics_admin_service/transports/base.py
@@ -101,6 +101,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -113,7 +115,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-analytics-admin/google/analytics/admin_v1alpha/services/analytics_admin_service/transports/grpc.py b/packages/google-analytics-admin/google/analytics/admin_v1alpha/services/analytics_admin_service/transports/grpc.py
index 24c56a37bdf9..4d51d993b37b 100644
--- a/packages/google-analytics-admin/google/analytics/admin_v1alpha/services/analytics_admin_service/transports/grpc.py
+++ b/packages/google-analytics-admin/google/analytics/admin_v1alpha/services/analytics_admin_service/transports/grpc.py
@@ -136,7 +136,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-analytics-admin/google/analytics/admin_v1alpha/services/analytics_admin_service/transports/grpc_asyncio.py b/packages/google-analytics-admin/google/analytics/admin_v1alpha/services/analytics_admin_service/transports/grpc_asyncio.py
index 6dded9b44078..74e6b73f4ffd 100644
--- a/packages/google-analytics-admin/google/analytics/admin_v1alpha/services/analytics_admin_service/transports/grpc_asyncio.py
+++ b/packages/google-analytics-admin/google/analytics/admin_v1alpha/services/analytics_admin_service/transports/grpc_asyncio.py
@@ -183,7 +183,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-analytics-admin/google/analytics/admin_v1beta/services/analytics_admin_service/transports/base.py b/packages/google-analytics-admin/google/analytics/admin_v1beta/services/analytics_admin_service/transports/base.py
index 551f1a87ec64..84b78fe68004 100644
--- a/packages/google-analytics-admin/google/analytics/admin_v1beta/services/analytics_admin_service/transports/base.py
+++ b/packages/google-analytics-admin/google/analytics/admin_v1beta/services/analytics_admin_service/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-analytics-admin/google/analytics/admin_v1beta/services/analytics_admin_service/transports/grpc.py b/packages/google-analytics-admin/google/analytics/admin_v1beta/services/analytics_admin_service/transports/grpc.py
index ef48d3e3f551..b39383a37a79 100644
--- a/packages/google-analytics-admin/google/analytics/admin_v1beta/services/analytics_admin_service/transports/grpc.py
+++ b/packages/google-analytics-admin/google/analytics/admin_v1beta/services/analytics_admin_service/transports/grpc.py
@@ -122,7 +122,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-analytics-admin/google/analytics/admin_v1beta/services/analytics_admin_service/transports/grpc_asyncio.py b/packages/google-analytics-admin/google/analytics/admin_v1beta/services/analytics_admin_service/transports/grpc_asyncio.py
index bc2b3b2608d3..c22d1917cf2f 100644
--- a/packages/google-analytics-admin/google/analytics/admin_v1beta/services/analytics_admin_service/transports/grpc_asyncio.py
+++ b/packages/google-analytics-admin/google/analytics/admin_v1beta/services/analytics_admin_service/transports/grpc_asyncio.py
@@ -169,7 +169,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-analytics-admin/noxfile.py b/packages/google-analytics-admin/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-analytics-admin/noxfile.py
+++ b/packages/google-analytics-admin/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-analytics-admin/setup.py b/packages/google-analytics-admin/setup.py
index 1abb8de4ca4c..21ce4aa65b2b 100644
--- a/packages/google-analytics-admin/setup.py
+++ b/packages/google-analytics-admin/setup.py
@@ -44,7 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-analytics-admin"
 
diff --git a/packages/google-analytics-admin/testing/constraints-3.7.txt b/packages/google-analytics-admin/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-analytics-admin/testing/constraints-3.7.txt
+++ b/packages/google-analytics-admin/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-analytics-admin/tests/unit/gapic/admin_v1alpha/test_analytics_admin_service.py b/packages/google-analytics-admin/tests/unit/gapic/admin_v1alpha/test_analytics_admin_service.py
index f07c20a08ed9..63b0e392aca8 100644
--- a/packages/google-analytics-admin/tests/unit/gapic/admin_v1alpha/test_analytics_admin_service.py
+++ b/packages/google-analytics-admin/tests/unit/gapic/admin_v1alpha/test_analytics_admin_service.py
@@ -1382,12 +1382,7 @@ async def test_get_account_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_account
         ] = mock_object
@@ -1753,12 +1748,7 @@ async def test_list_accounts_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_accounts
         ] = mock_object
@@ -2159,12 +2149,7 @@ async def test_delete_account_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_account
         ] = mock_object
@@ -2524,12 +2509,7 @@ async def test_update_account_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_account
         ] = mock_object
@@ -2918,12 +2898,7 @@ async def test_provision_account_ticket_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.provision_account_ticket
         ] = mock_object
@@ -3160,12 +3135,7 @@ async def test_list_account_summaries_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_account_summaries
         ] = mock_object
@@ -3608,12 +3578,7 @@ async def test_get_property_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_property
         ] = mock_object
@@ -3991,12 +3956,7 @@ async def test_list_properties_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_properties
         ] = mock_object
@@ -4424,12 +4384,7 @@ async def test_create_property_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_property
         ] = mock_object
@@ -4770,12 +4725,7 @@ async def test_delete_property_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_property
         ] = mock_object
@@ -5171,12 +5121,7 @@ async def test_update_property_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_property
         ] = mock_object
@@ -5577,12 +5522,7 @@ async def test_create_firebase_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_firebase_link
         ] = mock_object
@@ -5974,12 +5914,7 @@ async def test_delete_firebase_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_firebase_link
         ] = mock_object
@@ -6359,12 +6294,7 @@ async def test_list_firebase_links_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_firebase_links
         ] = mock_object
@@ -6952,12 +6882,7 @@ async def test_get_global_site_tag_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_global_site_tag
         ] = mock_object
@@ -7356,12 +7281,7 @@ async def test_create_google_ads_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_google_ads_link
         ] = mock_object
@@ -7770,12 +7690,7 @@ async def test_update_google_ads_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_google_ads_link
         ] = mock_object
@@ -8172,12 +8087,7 @@ async def test_delete_google_ads_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_google_ads_link
         ] = mock_object
@@ -8558,12 +8468,7 @@ async def test_list_google_ads_links_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_google_ads_links
         ] = mock_object
@@ -9164,12 +9069,7 @@ async def test_get_data_sharing_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_data_sharing_settings
         ] = mock_object
@@ -9573,12 +9473,7 @@ async def test_get_measurement_protocol_secret_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_measurement_protocol_secret
         ] = mock_object
@@ -9972,12 +9867,7 @@ async def test_list_measurement_protocol_secrets_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_measurement_protocol_secrets
         ] = mock_object
@@ -10571,12 +10461,7 @@ async def test_create_measurement_protocol_secret_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_measurement_protocol_secret
         ] = mock_object
@@ -10979,12 +10864,7 @@ async def test_delete_measurement_protocol_secret_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_measurement_protocol_secret
         ] = mock_object
@@ -11365,12 +11245,7 @@ async def test_update_measurement_protocol_secret_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_measurement_protocol_secret
         ] = mock_object
@@ -11777,12 +11652,7 @@ async def test_acknowledge_user_data_collection_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.acknowledge_user_data_collection
         ] = mock_object
@@ -12086,12 +11956,7 @@ async def test_get_sk_ad_network_conversion_value_schema_async_use_cached_wrappe
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_sk_ad_network_conversion_value_schema
         ] = mock_object
@@ -12490,12 +12355,7 @@ async def test_create_sk_ad_network_conversion_value_schema_async_use_cached_wra
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_sk_ad_network_conversion_value_schema
         ] = mock_object
@@ -12902,12 +12762,7 @@ async def test_delete_sk_ad_network_conversion_value_schema_async_use_cached_wra
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_sk_ad_network_conversion_value_schema
         ] = mock_object
@@ -13293,12 +13148,7 @@ async def test_update_sk_ad_network_conversion_value_schema_async_use_cached_wra
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_sk_ad_network_conversion_value_schema
         ] = mock_object
@@ -13712,12 +13562,7 @@ async def test_list_sk_ad_network_conversion_value_schemas_async_use_cached_wrap
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_sk_ad_network_conversion_value_schemas
         ] = mock_object
@@ -14323,12 +14168,7 @@ async def test_search_change_history_events_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.search_change_history_events
         ] = mock_object
@@ -14837,12 +14677,7 @@ async def test_get_google_signals_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_google_signals_settings
         ] = mock_object
@@ -15242,12 +15077,7 @@ async def test_update_google_signals_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_google_signals_settings
         ] = mock_object
@@ -15667,12 +15497,7 @@ async def test_create_conversion_event_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_conversion_event
         ] = mock_object
@@ -16092,12 +15917,7 @@ async def test_update_conversion_event_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_conversion_event
         ] = mock_object
@@ -16520,12 +16340,7 @@ async def test_get_conversion_event_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_conversion_event
         ] = mock_object
@@ -16917,12 +16732,7 @@ async def test_delete_conversion_event_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_conversion_event
         ] = mock_object
@@ -17303,12 +17113,7 @@ async def test_list_conversion_events_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_conversion_events
         ] = mock_object
@@ -17900,12 +17705,7 @@ async def test_get_display_video360_advertiser_link_async_use_cached_wrapped_rpc
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_display_video360_advertiser_link
         ] = mock_object
@@ -18299,12 +18099,7 @@ async def test_list_display_video360_advertiser_links_async_use_cached_wrapped_r
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_display_video360_advertiser_links
         ] = mock_object
@@ -18900,12 +18695,7 @@ async def test_create_display_video360_advertiser_link_async_use_cached_wrapped_
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_display_video360_advertiser_link
         ] = mock_object
@@ -19308,12 +19098,7 @@ async def test_delete_display_video360_advertiser_link_async_use_cached_wrapped_
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_display_video360_advertiser_link
         ] = mock_object
@@ -19694,12 +19479,7 @@ async def test_update_display_video360_advertiser_link_async_use_cached_wrapped_
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_display_video360_advertiser_link
         ] = mock_object
@@ -20126,12 +19906,7 @@ async def test_get_display_video360_advertiser_link_proposal_async_use_cached_wr
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_display_video360_advertiser_link_proposal
         ] = mock_object
@@ -20543,12 +20318,7 @@ async def test_list_display_video360_advertiser_link_proposals_async_use_cached_
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_display_video360_advertiser_link_proposals
         ] = mock_object
@@ -21184,12 +20954,7 @@ async def test_create_display_video360_advertiser_link_proposal_async_use_cached
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_display_video360_advertiser_link_proposal
         ] = mock_object
@@ -21615,12 +21380,7 @@ async def test_delete_display_video360_advertiser_link_proposal_async_use_cached
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_display_video360_advertiser_link_proposal
         ] = mock_object
@@ -22019,12 +21779,7 @@ async def test_approve_display_video360_advertiser_link_proposal_async_use_cache
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.approve_display_video360_advertiser_link_proposal
         ] = mock_object
@@ -22357,12 +22112,7 @@ async def test_cancel_display_video360_advertiser_link_proposal_async_use_cached
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.cancel_display_video360_advertiser_link_proposal
         ] = mock_object
@@ -22690,12 +22440,7 @@ async def test_create_custom_dimension_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_custom_dimension
         ] = mock_object
@@ -23114,12 +22859,7 @@ async def test_update_custom_dimension_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_custom_dimension
         ] = mock_object
@@ -23529,12 +23269,7 @@ async def test_list_custom_dimensions_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_custom_dimensions
         ] = mock_object
@@ -24113,12 +23848,7 @@ async def test_archive_custom_dimension_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.archive_custom_dimension
         ] = mock_object
@@ -24511,12 +24241,7 @@ async def test_get_custom_dimension_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_custom_dimension
         ] = mock_object
@@ -24937,12 +24662,7 @@ async def test_create_custom_metric_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_custom_metric
         ] = mock_object
@@ -25375,12 +25095,7 @@ async def test_update_custom_metric_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_custom_metric
         ] = mock_object
@@ -25795,12 +25510,7 @@ async def test_list_custom_metrics_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_custom_metrics
         ] = mock_object
@@ -26379,12 +26089,7 @@ async def test_archive_custom_metric_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.archive_custom_metric
         ] = mock_object
@@ -26784,12 +26489,7 @@ async def test_get_custom_metric_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_custom_metric
         ] = mock_object
@@ -27201,12 +26901,7 @@ async def test_get_data_retention_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_data_retention_settings
         ] = mock_object
@@ -27606,12 +27301,7 @@ async def test_update_data_retention_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_data_retention_settings
         ] = mock_object
@@ -28021,12 +27711,7 @@ async def test_create_data_stream_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_data_stream
         ] = mock_object
@@ -28444,12 +28129,7 @@ async def test_delete_data_stream_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_data_stream
         ] = mock_object
@@ -28829,12 +28509,7 @@ async def test_update_data_stream_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_data_stream
         ] = mock_object
@@ -29259,12 +28934,7 @@ async def test_list_data_streams_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_data_streams
         ] = mock_object
@@ -29842,12 +29512,7 @@ async def test_get_data_stream_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_data_stream
         ] = mock_object
@@ -30233,12 +29898,7 @@ async def test_get_audience_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_audience
         ] = mock_object
@@ -30613,12 +30273,7 @@ async def test_list_audiences_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_audiences
         ] = mock_object
@@ -31190,12 +30845,7 @@ async def test_create_audience_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_audience
         ] = mock_object
@@ -31596,12 +31246,7 @@ async def test_update_audience_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_audience
         ] = mock_object
@@ -31983,12 +31628,7 @@ async def test_archive_audience_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.archive_audience
         ] = mock_object
@@ -32282,12 +31922,7 @@ async def test_get_search_ads360_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_search_ads360_link
         ] = mock_object
@@ -32681,12 +32316,7 @@ async def test_list_search_ads360_links_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_search_ads360_links
         ] = mock_object
@@ -33278,12 +32908,7 @@ async def test_create_search_ads360_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_search_ads360_link
         ] = mock_object
@@ -33678,12 +33303,7 @@ async def test_delete_search_ads360_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_search_ads360_link
         ] = mock_object
@@ -34064,12 +33684,7 @@ async def test_update_search_ads360_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_search_ads360_link
         ] = mock_object
@@ -34495,12 +34110,7 @@ async def test_get_attribution_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_attribution_settings
         ] = mock_object
@@ -34928,12 +34538,7 @@ async def test_update_attribution_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_attribution_settings
         ] = mock_object
@@ -35350,12 +34955,7 @@ async def test_run_access_report_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.run_access_report
         ] = mock_object
@@ -35660,12 +35260,7 @@ async def test_create_access_binding_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_access_binding
         ] = mock_object
@@ -36068,12 +35663,7 @@ async def test_get_access_binding_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_access_binding
         ] = mock_object
@@ -36463,12 +36053,7 @@ async def test_update_access_binding_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_access_binding
         ] = mock_object
@@ -36851,12 +36436,7 @@ async def test_delete_access_binding_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_access_binding
         ] = mock_object
@@ -37236,12 +36816,7 @@ async def test_list_access_bindings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_access_bindings
         ] = mock_object
@@ -37822,12 +37397,7 @@ async def test_batch_create_access_bindings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_create_access_bindings
         ] = mock_object
@@ -38121,12 +37691,7 @@ async def test_batch_get_access_bindings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_get_access_bindings
         ] = mock_object
@@ -38420,12 +37985,7 @@ async def test_batch_update_access_bindings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_update_access_bindings
         ] = mock_object
@@ -38717,12 +38277,7 @@ async def test_batch_delete_access_bindings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_delete_access_bindings
         ] = mock_object
@@ -39029,12 +38584,7 @@ async def test_get_expanded_data_set_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_expanded_data_set
         ] = mock_object
@@ -39432,12 +38982,7 @@ async def test_list_expanded_data_sets_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_expanded_data_sets
         ] = mock_object
@@ -40035,12 +39580,7 @@ async def test_create_expanded_data_set_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_expanded_data_set
         ] = mock_object
@@ -40454,12 +39994,7 @@ async def test_update_expanded_data_set_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_expanded_data_set
         ] = mock_object
@@ -40858,12 +40393,7 @@ async def test_delete_expanded_data_set_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_expanded_data_set
         ] = mock_object
@@ -41248,12 +40778,7 @@ async def test_get_channel_group_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_channel_group
         ] = mock_object
@@ -41647,12 +41172,7 @@ async def test_list_channel_groups_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_channel_groups
         ] = mock_object
@@ -42246,12 +41766,7 @@ async def test_create_channel_group_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_channel_group
         ] = mock_object
@@ -42659,12 +42174,7 @@ async def test_update_channel_group_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_channel_group
         ] = mock_object
@@ -43060,12 +42570,7 @@ async def test_delete_channel_group_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_channel_group
         ] = mock_object
@@ -43441,12 +42946,7 @@ async def test_set_automated_ga4_configuration_opt_out_async_use_cached_wrapped_
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.set_automated_ga4_configuration_opt_out
         ] = mock_object
@@ -43688,12 +43188,7 @@ async def test_fetch_automated_ga4_configuration_opt_out_async_use_cached_wrappe
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.fetch_automated_ga4_configuration_opt_out
         ] = mock_object
@@ -43952,12 +43447,7 @@ async def test_get_big_query_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_big_query_link
         ] = mock_object
@@ -44359,12 +43849,7 @@ async def test_list_big_query_links_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_big_query_links
         ] = mock_object
@@ -44980,12 +44465,7 @@ async def test_get_enhanced_measurement_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_enhanced_measurement_settings
         ] = mock_object
@@ -45419,12 +44899,7 @@ async def test_update_enhanced_measurement_settings_async_use_cached_wrapped_rpc
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_enhanced_measurement_settings
         ] = mock_object
@@ -45845,12 +45320,7 @@ async def test_create_connected_site_tag_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_connected_site_tag
         ] = mock_object
@@ -46079,12 +45549,7 @@ async def test_delete_connected_site_tag_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_connected_site_tag
         ] = mock_object
@@ -46311,12 +45776,7 @@ async def test_list_connected_site_tags_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_connected_site_tags
         ] = mock_object
@@ -46550,12 +46010,7 @@ async def test_fetch_connected_ga4_property_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.fetch_connected_ga4_property
         ] = mock_object
@@ -46792,12 +46247,7 @@ async def test_get_ad_sense_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_ad_sense_link
         ] = mock_object
@@ -47188,12 +46638,7 @@ async def test_create_ad_sense_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_ad_sense_link
         ] = mock_object
@@ -47585,12 +47030,7 @@ async def test_delete_ad_sense_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_ad_sense_link
         ] = mock_object
@@ -47970,12 +47410,7 @@ async def test_list_ad_sense_links_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_ad_sense_links
         ] = mock_object
@@ -48567,12 +48002,7 @@ async def test_get_event_create_rule_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_event_create_rule
         ] = mock_object
@@ -48966,12 +48396,7 @@ async def test_list_event_create_rules_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_event_create_rules
         ] = mock_object
@@ -49567,12 +48992,7 @@ async def test_create_event_create_rule_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_event_create_rule
         ] = mock_object
@@ -49976,12 +49396,7 @@ async def test_update_event_create_rule_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_event_create_rule
         ] = mock_object
@@ -50376,12 +49791,7 @@ async def test_delete_event_create_rule_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_event_create_rule
         ] = mock_object
@@ -50765,12 +50175,7 @@ async def test_update_data_redaction_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_data_redaction_settings
         ] = mock_object
@@ -51183,12 +50588,7 @@ async def test_get_data_redaction_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_data_redaction_settings
         ] = mock_object
@@ -51609,12 +51009,7 @@ async def test_get_calculated_metric_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_calculated_metric
         ] = mock_object
@@ -52049,12 +51444,7 @@ async def test_create_calculated_metric_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_calculated_metric
         ] = mock_object
@@ -52482,12 +51872,7 @@ async def test_list_calculated_metrics_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_calculated_metrics
         ] = mock_object
@@ -53096,12 +52481,7 @@ async def test_update_calculated_metric_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_calculated_metric
         ] = mock_object
@@ -53510,12 +52890,7 @@ async def test_delete_calculated_metric_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_calculated_metric
         ] = mock_object
@@ -53885,12 +53260,7 @@ async def test_create_rollup_property_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_rollup_property
         ] = mock_object
@@ -54127,12 +53497,7 @@ async def test_get_rollup_property_source_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_rollup_property_source_link
         ] = mock_object
@@ -54524,12 +53889,7 @@ async def test_list_rollup_property_source_links_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_rollup_property_source_links
         ] = mock_object
@@ -55118,12 +54478,7 @@ async def test_create_rollup_property_source_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_rollup_property_source_link
         ] = mock_object
@@ -55524,12 +54879,7 @@ async def test_delete_rollup_property_source_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_rollup_property_source_link
         ] = mock_object
@@ -55902,12 +55252,7 @@ async def test_create_subproperty_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_subproperty
         ] = mock_object
@@ -56144,12 +55489,7 @@ async def test_create_subproperty_event_filter_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_subproperty_event_filter
         ] = mock_object
@@ -56564,12 +55904,7 @@ async def test_get_subproperty_event_filter_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_subproperty_event_filter
         ] = mock_object
@@ -56961,12 +56296,7 @@ async def test_list_subproperty_event_filters_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_subproperty_event_filters
         ] = mock_object
@@ -57557,12 +56887,7 @@ async def test_update_subproperty_event_filter_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_subproperty_event_filter
         ] = mock_object
@@ -57967,12 +57292,7 @@ async def test_delete_subproperty_event_filter_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_subproperty_event_filter
         ] = mock_object
diff --git a/packages/google-analytics-admin/tests/unit/gapic/admin_v1beta/test_analytics_admin_service.py b/packages/google-analytics-admin/tests/unit/gapic/admin_v1beta/test_analytics_admin_service.py
index 1d3c5be88174..79f482efdf2c 100644
--- a/packages/google-analytics-admin/tests/unit/gapic/admin_v1beta/test_analytics_admin_service.py
+++ b/packages/google-analytics-admin/tests/unit/gapic/admin_v1beta/test_analytics_admin_service.py
@@ -1369,12 +1369,7 @@ async def test_get_account_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_account
         ] = mock_object
@@ -1740,12 +1735,7 @@ async def test_list_accounts_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_accounts
         ] = mock_object
@@ -2146,12 +2136,7 @@ async def test_delete_account_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_account
         ] = mock_object
@@ -2511,12 +2496,7 @@ async def test_update_account_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_account
         ] = mock_object
@@ -2905,12 +2885,7 @@ async def test_provision_account_ticket_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.provision_account_ticket
         ] = mock_object
@@ -3147,12 +3122,7 @@ async def test_list_account_summaries_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_account_summaries
         ] = mock_object
@@ -3595,12 +3565,7 @@ async def test_get_property_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_property
         ] = mock_object
@@ -3978,12 +3943,7 @@ async def test_list_properties_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_properties
         ] = mock_object
@@ -4411,12 +4371,7 @@ async def test_create_property_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_property
         ] = mock_object
@@ -4757,12 +4712,7 @@ async def test_delete_property_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_property
         ] = mock_object
@@ -5158,12 +5108,7 @@ async def test_update_property_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_property
         ] = mock_object
@@ -5564,12 +5509,7 @@ async def test_create_firebase_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_firebase_link
         ] = mock_object
@@ -5961,12 +5901,7 @@ async def test_delete_firebase_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_firebase_link
         ] = mock_object
@@ -6346,12 +6281,7 @@ async def test_list_firebase_links_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_firebase_links
         ] = mock_object
@@ -6946,12 +6876,7 @@ async def test_create_google_ads_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_google_ads_link
         ] = mock_object
@@ -7360,12 +7285,7 @@ async def test_update_google_ads_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_google_ads_link
         ] = mock_object
@@ -7762,12 +7682,7 @@ async def test_delete_google_ads_link_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_google_ads_link
         ] = mock_object
@@ -8148,12 +8063,7 @@ async def test_list_google_ads_links_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_google_ads_links
         ] = mock_object
@@ -8754,12 +8664,7 @@ async def test_get_data_sharing_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_data_sharing_settings
         ] = mock_object
@@ -9163,12 +9068,7 @@ async def test_get_measurement_protocol_secret_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_measurement_protocol_secret
         ] = mock_object
@@ -9562,12 +9462,7 @@ async def test_list_measurement_protocol_secrets_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_measurement_protocol_secrets
         ] = mock_object
@@ -10161,12 +10056,7 @@ async def test_create_measurement_protocol_secret_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_measurement_protocol_secret
         ] = mock_object
@@ -10569,12 +10459,7 @@ async def test_delete_measurement_protocol_secret_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_measurement_protocol_secret
         ] = mock_object
@@ -10955,12 +10840,7 @@ async def test_update_measurement_protocol_secret_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_measurement_protocol_secret
         ] = mock_object
@@ -11367,12 +11247,7 @@ async def test_acknowledge_user_data_collection_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.acknowledge_user_data_collection
         ] = mock_object
@@ -11675,12 +11550,7 @@ async def test_search_change_history_events_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.search_change_history_events
         ] = mock_object
@@ -12195,12 +12065,7 @@ async def test_create_conversion_event_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_conversion_event
         ] = mock_object
@@ -12620,12 +12485,7 @@ async def test_update_conversion_event_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_conversion_event
         ] = mock_object
@@ -13048,12 +12908,7 @@ async def test_get_conversion_event_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_conversion_event
         ] = mock_object
@@ -13445,12 +13300,7 @@ async def test_delete_conversion_event_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_conversion_event
         ] = mock_object
@@ -13831,12 +13681,7 @@ async def test_list_conversion_events_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_conversion_events
         ] = mock_object
@@ -14437,12 +14282,7 @@ async def test_create_custom_dimension_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_custom_dimension
         ] = mock_object
@@ -14861,12 +14701,7 @@ async def test_update_custom_dimension_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_custom_dimension
         ] = mock_object
@@ -15276,12 +15111,7 @@ async def test_list_custom_dimensions_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_custom_dimensions
         ] = mock_object
@@ -15860,12 +15690,7 @@ async def test_archive_custom_dimension_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.archive_custom_dimension
         ] = mock_object
@@ -16258,12 +16083,7 @@ async def test_get_custom_dimension_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_custom_dimension
         ] = mock_object
@@ -16684,12 +16504,7 @@ async def test_create_custom_metric_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_custom_metric
         ] = mock_object
@@ -17122,12 +16937,7 @@ async def test_update_custom_metric_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_custom_metric
         ] = mock_object
@@ -17542,12 +17352,7 @@ async def test_list_custom_metrics_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_custom_metrics
         ] = mock_object
@@ -18126,12 +17931,7 @@ async def test_archive_custom_metric_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.archive_custom_metric
         ] = mock_object
@@ -18531,12 +18331,7 @@ async def test_get_custom_metric_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_custom_metric
         ] = mock_object
@@ -18948,12 +18743,7 @@ async def test_get_data_retention_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_data_retention_settings
         ] = mock_object
@@ -19353,12 +19143,7 @@ async def test_update_data_retention_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_data_retention_settings
         ] = mock_object
@@ -19768,12 +19553,7 @@ async def test_create_data_stream_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_data_stream
         ] = mock_object
@@ -20191,12 +19971,7 @@ async def test_delete_data_stream_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_data_stream
         ] = mock_object
@@ -20576,12 +20351,7 @@ async def test_update_data_stream_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_data_stream
         ] = mock_object
@@ -21006,12 +20776,7 @@ async def test_list_data_streams_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_data_streams
         ] = mock_object
@@ -21589,12 +21354,7 @@ async def test_get_data_stream_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_data_stream
         ] = mock_object
@@ -21974,12 +21734,7 @@ async def test_run_access_report_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.run_access_report
         ] = mock_object
diff --git a/packages/google-analytics-data/google/analytics/data_v1alpha/services/alpha_analytics_data/transports/base.py b/packages/google-analytics-data/google/analytics/data_v1alpha/services/alpha_analytics_data/transports/base.py
index e622a157f510..c2c66c588816 100644
--- a/packages/google-analytics-data/google/analytics/data_v1alpha/services/alpha_analytics_data/transports/base.py
+++ b/packages/google-analytics-data/google/analytics/data_v1alpha/services/alpha_analytics_data/transports/base.py
@@ -88,6 +88,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -100,7 +102,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-analytics-data/google/analytics/data_v1alpha/services/alpha_analytics_data/transports/grpc.py b/packages/google-analytics-data/google/analytics/data_v1alpha/services/alpha_analytics_data/transports/grpc.py
index 4d1cc99def15..b9962cad40e2 100644
--- a/packages/google-analytics-data/google/analytics/data_v1alpha/services/alpha_analytics_data/transports/grpc.py
+++ b/packages/google-analytics-data/google/analytics/data_v1alpha/services/alpha_analytics_data/transports/grpc.py
@@ -123,7 +123,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-analytics-data/google/analytics/data_v1alpha/services/alpha_analytics_data/transports/grpc_asyncio.py b/packages/google-analytics-data/google/analytics/data_v1alpha/services/alpha_analytics_data/transports/grpc_asyncio.py
index e2c24e4ce57e..c05a987fbb2b 100644
--- a/packages/google-analytics-data/google/analytics/data_v1alpha/services/alpha_analytics_data/transports/grpc_asyncio.py
+++ b/packages/google-analytics-data/google/analytics/data_v1alpha/services/alpha_analytics_data/transports/grpc_asyncio.py
@@ -170,7 +170,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-analytics-data/google/analytics/data_v1beta/services/beta_analytics_data/transports/base.py b/packages/google-analytics-data/google/analytics/data_v1beta/services/beta_analytics_data/transports/base.py
index f0e90fee0134..a7eaa23f7d7b 100644
--- a/packages/google-analytics-data/google/analytics/data_v1beta/services/beta_analytics_data/transports/base.py
+++ b/packages/google-analytics-data/google/analytics/data_v1beta/services/beta_analytics_data/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-analytics-data/google/analytics/data_v1beta/services/beta_analytics_data/transports/grpc.py b/packages/google-analytics-data/google/analytics/data_v1beta/services/beta_analytics_data/transports/grpc.py
index f801f5060b1b..e4a4e1d03fa2 100644
--- a/packages/google-analytics-data/google/analytics/data_v1beta/services/beta_analytics_data/transports/grpc.py
+++ b/packages/google-analytics-data/google/analytics/data_v1beta/services/beta_analytics_data/transports/grpc.py
@@ -123,7 +123,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-analytics-data/google/analytics/data_v1beta/services/beta_analytics_data/transports/grpc_asyncio.py b/packages/google-analytics-data/google/analytics/data_v1beta/services/beta_analytics_data/transports/grpc_asyncio.py
index 1a515037b588..b18b41339c27 100644
--- a/packages/google-analytics-data/google/analytics/data_v1beta/services/beta_analytics_data/transports/grpc_asyncio.py
+++ b/packages/google-analytics-data/google/analytics/data_v1beta/services/beta_analytics_data/transports/grpc_asyncio.py
@@ -170,7 +170,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-analytics-data/noxfile.py b/packages/google-analytics-data/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-analytics-data/noxfile.py
+++ b/packages/google-analytics-data/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-analytics-data/setup.py b/packages/google-analytics-data/setup.py
index 00abe5f89ac3..db1561ea7edd 100644
--- a/packages/google-analytics-data/setup.py
+++ b/packages/google-analytics-data/setup.py
@@ -44,7 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-analytics-data"
 
diff --git a/packages/google-analytics-data/testing/constraints-3.7.txt b/packages/google-analytics-data/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-analytics-data/testing/constraints-3.7.txt
+++ b/packages/google-analytics-data/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-analytics-data/tests/unit/gapic/data_v1alpha/test_alpha_analytics_data.py b/packages/google-analytics-data/tests/unit/gapic/data_v1alpha/test_alpha_analytics_data.py
index a71b4530d0b2..d7867d051016 100644
--- a/packages/google-analytics-data/tests/unit/gapic/data_v1alpha/test_alpha_analytics_data.py
+++ b/packages/google-analytics-data/tests/unit/gapic/data_v1alpha/test_alpha_analytics_data.py
@@ -1350,12 +1350,7 @@ async def test_run_funnel_report_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.run_funnel_report
         ] = mock_object
@@ -1655,12 +1650,7 @@ async def test_create_audience_list_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_audience_list
         ] = mock_object
@@ -2058,12 +2048,7 @@ async def test_query_audience_list_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.query_audience_list
         ] = mock_object
@@ -2457,12 +2442,7 @@ async def test_sheet_export_audience_list_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.sheet_export_audience_list
         ] = mock_object
@@ -2875,12 +2855,7 @@ async def test_get_audience_list_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_audience_list
         ] = mock_object
@@ -3285,12 +3260,7 @@ async def test_list_audience_lists_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_audience_lists
         ] = mock_object
@@ -3888,12 +3858,7 @@ async def test_create_recurring_audience_list_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_recurring_audience_list
         ] = mock_object
@@ -4319,12 +4284,7 @@ async def test_get_recurring_audience_list_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_recurring_audience_list
         ] = mock_object
@@ -4722,12 +4682,7 @@ async def test_list_recurring_audience_lists_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_recurring_audience_lists
         ] = mock_object
@@ -5315,12 +5270,7 @@ async def test_create_report_task_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_report_task
         ] = mock_object
@@ -5716,12 +5666,7 @@ async def test_query_report_task_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.query_report_task
         ] = mock_object
@@ -6096,12 +6041,7 @@ async def test_get_report_task_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_report_task
         ] = mock_object
@@ -6478,12 +6418,7 @@ async def test_list_report_tasks_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_report_tasks
         ] = mock_object
diff --git a/packages/google-analytics-data/tests/unit/gapic/data_v1beta/test_beta_analytics_data.py b/packages/google-analytics-data/tests/unit/gapic/data_v1beta/test_beta_analytics_data.py
index 2ee8cfd491fc..78c9ae781525 100644
--- a/packages/google-analytics-data/tests/unit/gapic/data_v1beta/test_beta_analytics_data.py
+++ b/packages/google-analytics-data/tests/unit/gapic/data_v1beta/test_beta_analytics_data.py
@@ -1335,12 +1335,7 @@ async def test_run_report_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.run_report
         ] = mock_object
@@ -1628,12 +1623,7 @@ async def test_run_pivot_report_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.run_pivot_report
         ] = mock_object
@@ -1926,12 +1916,7 @@ async def test_batch_run_reports_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_run_reports
         ] = mock_object
@@ -2233,12 +2218,7 @@ async def test_batch_run_pivot_reports_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_run_pivot_reports
         ] = mock_object
@@ -2527,12 +2507,7 @@ async def test_get_metadata_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_metadata
         ] = mock_object
@@ -2911,12 +2886,7 @@ async def test_run_realtime_report_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.run_realtime_report
         ] = mock_object
@@ -3214,12 +3184,7 @@ async def test_check_compatibility_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.check_compatibility
         ] = mock_object
@@ -3517,12 +3482,7 @@ async def test_create_audience_export_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_audience_export
         ] = mock_object
@@ -3921,12 +3881,7 @@ async def test_query_audience_export_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.query_audience_export
         ] = mock_object
@@ -4334,12 +4289,7 @@ async def test_get_audience_export_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_audience_export
         ] = mock_object
@@ -4743,12 +4693,7 @@ async def test_list_audience_exports_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_audience_exports
         ] = mock_object
diff --git a/packages/google-apps-chat/google/apps/chat_v1/services/chat_service/transports/base.py b/packages/google-apps-chat/google/apps/chat_v1/services/chat_service/transports/base.py
index abf0c8bbe095..543b1a31874c 100644
--- a/packages/google-apps-chat/google/apps/chat_v1/services/chat_service/transports/base.py
+++ b/packages/google-apps-chat/google/apps/chat_v1/services/chat_service/transports/base.py
@@ -116,6 +116,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -128,7 +130,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-apps-chat/google/apps/chat_v1/services/chat_service/transports/grpc.py b/packages/google-apps-chat/google/apps/chat_v1/services/chat_service/transports/grpc.py
index b83a88a847d3..6e36385be192 100644
--- a/packages/google-apps-chat/google/apps/chat_v1/services/chat_service/transports/grpc.py
+++ b/packages/google-apps-chat/google/apps/chat_v1/services/chat_service/transports/grpc.py
@@ -134,7 +134,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-apps-chat/google/apps/chat_v1/services/chat_service/transports/grpc_asyncio.py b/packages/google-apps-chat/google/apps/chat_v1/services/chat_service/transports/grpc_asyncio.py
index 1852bd752241..fb2a66bc013c 100644
--- a/packages/google-apps-chat/google/apps/chat_v1/services/chat_service/transports/grpc_asyncio.py
+++ b/packages/google-apps-chat/google/apps/chat_v1/services/chat_service/transports/grpc_asyncio.py
@@ -181,7 +181,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-apps-chat/setup.py b/packages/google-apps-chat/setup.py
index 1b399c38c78b..8e31d1508b69 100644
--- a/packages/google-apps-chat/setup.py
+++ b/packages/google-apps-chat/setup.py
@@ -44,7 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
     "google-apps-card >= 0.1.2, <1.0.0dev",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-apps-chat"
diff --git a/packages/google-apps-chat/testing/constraints-3.7.txt b/packages/google-apps-chat/testing/constraints-3.7.txt
index 169496b87947..1cf86452aeb4 100644
--- a/packages/google-apps-chat/testing/constraints-3.7.txt
+++ b/packages/google-apps-chat/testing/constraints-3.7.txt
@@ -7,5 +7,5 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
 google-apps-card==0.1.2
diff --git a/packages/google-apps-chat/tests/unit/gapic/chat_v1/test_chat_service.py b/packages/google-apps-chat/tests/unit/gapic/chat_v1/test_chat_service.py
index 594602653afa..d6a83e2a9d57 100644
--- a/packages/google-apps-chat/tests/unit/gapic/chat_v1/test_chat_service.py
+++ b/packages/google-apps-chat/tests/unit/gapic/chat_v1/test_chat_service.py
@@ -1317,12 +1317,7 @@ async def test_create_message_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_message
         ] = mock_object
@@ -1720,12 +1715,7 @@ async def test_list_messages_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_messages
         ] = mock_object
@@ -2285,12 +2275,7 @@ async def test_list_memberships_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_memberships
         ] = mock_object
@@ -2850,12 +2835,7 @@ async def test_get_membership_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_membership
         ] = mock_object
@@ -3241,12 +3221,7 @@ async def test_get_message_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_message
         ] = mock_object
@@ -3632,12 +3607,7 @@ async def test_update_message_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_message
         ] = mock_object
@@ -4012,12 +3982,7 @@ async def test_delete_message_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_message
         ] = mock_object
@@ -4387,12 +4352,7 @@ async def test_get_attachment_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_attachment
         ] = mock_object
@@ -4773,12 +4733,7 @@ async def test_upload_attachment_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.upload_attachment
         ] = mock_object
@@ -5065,12 +5020,7 @@ async def test_list_spaces_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_spaces
         ] = mock_object
@@ -5512,12 +5462,7 @@ async def test_get_space_async_use_cached_wrapped_rpc(transport: str = "grpc_asy
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_space
         ] = mock_object
@@ -5938,12 +5883,7 @@ async def test_create_space_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_space
         ] = mock_object
@@ -6305,12 +6245,7 @@ async def test_set_up_space_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.set_up_space
         ] = mock_object
@@ -6588,12 +6523,7 @@ async def test_update_space_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_space
         ] = mock_object
@@ -6981,12 +6911,7 @@ async def test_delete_space_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_space
         ] = mock_object
@@ -7349,12 +7274,7 @@ async def test_complete_import_space_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.complete_import_space
         ] = mock_object
@@ -7687,12 +7607,7 @@ async def test_find_direct_message_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.find_direct_message
         ] = mock_object
@@ -7956,12 +7871,7 @@ async def test_create_membership_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_membership
         ] = mock_object
@@ -8361,12 +8271,7 @@ async def test_update_membership_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_membership
         ] = mock_object
@@ -8770,12 +8675,7 @@ async def test_delete_membership_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_membership
         ] = mock_object
@@ -9153,12 +9053,7 @@ async def test_create_reaction_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_reaction
         ] = mock_object
@@ -9536,12 +9431,7 @@ async def test_list_reactions_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_reactions
         ] = mock_object
@@ -10088,12 +9978,7 @@ async def test_delete_reaction_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_reaction
         ] = mock_object
@@ -10460,12 +10345,7 @@ async def test_get_space_read_state_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_space_read_state
         ] = mock_object
@@ -10849,12 +10729,7 @@ async def test_update_space_read_state_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_space_read_state
         ] = mock_object
@@ -11252,12 +11127,7 @@ async def test_get_thread_read_state_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_thread_read_state
         ] = mock_object
diff --git a/packages/google-apps-events-subscriptions/google/apps/events_subscriptions_v1/services/subscriptions_service/transports/base.py b/packages/google-apps-events-subscriptions/google/apps/events_subscriptions_v1/services/subscriptions_service/transports/base.py
index 3ed8a13d7fe9..0b17a43c11c0 100644
--- a/packages/google-apps-events-subscriptions/google/apps/events_subscriptions_v1/services/subscriptions_service/transports/base.py
+++ b/packages/google-apps-events-subscriptions/google/apps/events_subscriptions_v1/services/subscriptions_service/transports/base.py
@@ -97,6 +97,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -109,7 +111,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-apps-events-subscriptions/google/apps/events_subscriptions_v1/services/subscriptions_service/transports/grpc.py b/packages/google-apps-events-subscriptions/google/apps/events_subscriptions_v1/services/subscriptions_service/transports/grpc.py
index 8b7c415e6a8f..6c0a7212cfed 100644
--- a/packages/google-apps-events-subscriptions/google/apps/events_subscriptions_v1/services/subscriptions_service/transports/grpc.py
+++ b/packages/google-apps-events-subscriptions/google/apps/events_subscriptions_v1/services/subscriptions_service/transports/grpc.py
@@ -127,7 +127,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-apps-events-subscriptions/google/apps/events_subscriptions_v1/services/subscriptions_service/transports/grpc_asyncio.py b/packages/google-apps-events-subscriptions/google/apps/events_subscriptions_v1/services/subscriptions_service/transports/grpc_asyncio.py
index 4049fbe9fb87..783c78466e47 100644
--- a/packages/google-apps-events-subscriptions/google/apps/events_subscriptions_v1/services/subscriptions_service/transports/grpc_asyncio.py
+++ b/packages/google-apps-events-subscriptions/google/apps/events_subscriptions_v1/services/subscriptions_service/transports/grpc_asyncio.py
@@ -174,7 +174,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-apps-events-subscriptions/noxfile.py b/packages/google-apps-events-subscriptions/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-apps-events-subscriptions/noxfile.py
+++ b/packages/google-apps-events-subscriptions/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-apps-events-subscriptions/setup.py b/packages/google-apps-events-subscriptions/setup.py
index 71fa85c0061b..a0e151e7c31d 100644
--- a/packages/google-apps-events-subscriptions/setup.py
+++ b/packages/google-apps-events-subscriptions/setup.py
@@ -46,7 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-apps-events-subscriptions"
 
diff --git a/packages/google-apps-events-subscriptions/testing/constraints-3.7.txt b/packages/google-apps-events-subscriptions/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-apps-events-subscriptions/testing/constraints-3.7.txt
+++ b/packages/google-apps-events-subscriptions/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-apps-events-subscriptions/tests/unit/gapic/events_subscriptions_v1/test_subscriptions_service.py b/packages/google-apps-events-subscriptions/tests/unit/gapic/events_subscriptions_v1/test_subscriptions_service.py
index 0d6a58ad1daf..bc79802bf591 100644
--- a/packages/google-apps-events-subscriptions/tests/unit/gapic/events_subscriptions_v1/test_subscriptions_service.py
+++ b/packages/google-apps-events-subscriptions/tests/unit/gapic/events_subscriptions_v1/test_subscriptions_service.py
@@ -1384,12 +1384,7 @@ async def test_create_subscription_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_subscription
         ] = mock_object
@@ -1725,12 +1720,7 @@ async def test_delete_subscription_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_subscription
         ] = mock_object
@@ -2135,12 +2125,7 @@ async def test_get_subscription_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_subscription
         ] = mock_object
@@ -2538,12 +2523,7 @@ async def test_list_subscriptions_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_subscriptions
         ] = mock_object
@@ -3055,12 +3035,7 @@ async def test_update_subscription_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_subscription
         ] = mock_object
@@ -3470,12 +3445,7 @@ async def test_reactivate_subscription_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.reactivate_subscription
         ] = mock_object
diff --git a/packages/google-apps-meet/google/apps/meet_v2/services/conference_records_service/transports/base.py b/packages/google-apps-meet/google/apps/meet_v2/services/conference_records_service/transports/base.py
index cd83d784fa18..65a2770b4ee9 100644
--- a/packages/google-apps-meet/google/apps/meet_v2/services/conference_records_service/transports/base.py
+++ b/packages/google-apps-meet/google/apps/meet_v2/services/conference_records_service/transports/base.py
@@ -84,6 +84,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -96,7 +98,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-apps-meet/google/apps/meet_v2/services/conference_records_service/transports/grpc.py b/packages/google-apps-meet/google/apps/meet_v2/services/conference_records_service/transports/grpc.py
index b8735b3c769d..ba28204d6484 100644
--- a/packages/google-apps-meet/google/apps/meet_v2/services/conference_records_service/transports/grpc.py
+++ b/packages/google-apps-meet/google/apps/meet_v2/services/conference_records_service/transports/grpc.py
@@ -121,7 +121,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-apps-meet/google/apps/meet_v2/services/conference_records_service/transports/grpc_asyncio.py b/packages/google-apps-meet/google/apps/meet_v2/services/conference_records_service/transports/grpc_asyncio.py
index 1ab536da9308..3afe3e745746 100644
--- a/packages/google-apps-meet/google/apps/meet_v2/services/conference_records_service/transports/grpc_asyncio.py
+++ b/packages/google-apps-meet/google/apps/meet_v2/services/conference_records_service/transports/grpc_asyncio.py
@@ -168,7 +168,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-apps-meet/google/apps/meet_v2/services/spaces_service/transports/base.py b/packages/google-apps-meet/google/apps/meet_v2/services/spaces_service/transports/base.py
index 7fd69e5d7753..571ff4192a03 100644
--- a/packages/google-apps-meet/google/apps/meet_v2/services/spaces_service/transports/base.py
+++ b/packages/google-apps-meet/google/apps/meet_v2/services/spaces_service/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-apps-meet/google/apps/meet_v2/services/spaces_service/transports/grpc.py b/packages/google-apps-meet/google/apps/meet_v2/services/spaces_service/transports/grpc.py
index 95062c7b47c3..ac441fd3a091 100644
--- a/packages/google-apps-meet/google/apps/meet_v2/services/spaces_service/transports/grpc.py
+++ b/packages/google-apps-meet/google/apps/meet_v2/services/spaces_service/transports/grpc.py
@@ -122,7 +122,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-apps-meet/google/apps/meet_v2/services/spaces_service/transports/grpc_asyncio.py b/packages/google-apps-meet/google/apps/meet_v2/services/spaces_service/transports/grpc_asyncio.py
index 9d17c3ffc514..f642e8805c76 100644
--- a/packages/google-apps-meet/google/apps/meet_v2/services/spaces_service/transports/grpc_asyncio.py
+++ b/packages/google-apps-meet/google/apps/meet_v2/services/spaces_service/transports/grpc_asyncio.py
@@ -169,7 +169,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-apps-meet/google/apps/meet_v2beta/services/conference_records_service/transports/base.py b/packages/google-apps-meet/google/apps/meet_v2beta/services/conference_records_service/transports/base.py
index 8f3b2da80424..0c4a9f025404 100644
--- a/packages/google-apps-meet/google/apps/meet_v2beta/services/conference_records_service/transports/base.py
+++ b/packages/google-apps-meet/google/apps/meet_v2beta/services/conference_records_service/transports/base.py
@@ -81,6 +81,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -93,7 +95,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-apps-meet/google/apps/meet_v2beta/services/conference_records_service/transports/grpc.py b/packages/google-apps-meet/google/apps/meet_v2beta/services/conference_records_service/transports/grpc.py
index 165e61f34f5e..7d4db08cf9d9 100644
--- a/packages/google-apps-meet/google/apps/meet_v2beta/services/conference_records_service/transports/grpc.py
+++ b/packages/google-apps-meet/google/apps/meet_v2beta/services/conference_records_service/transports/grpc.py
@@ -121,7 +121,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-apps-meet/google/apps/meet_v2beta/services/conference_records_service/transports/grpc_asyncio.py b/packages/google-apps-meet/google/apps/meet_v2beta/services/conference_records_service/transports/grpc_asyncio.py
index cb2fef33bc1e..17e36ee76a11 100644
--- a/packages/google-apps-meet/google/apps/meet_v2beta/services/conference_records_service/transports/grpc_asyncio.py
+++ b/packages/google-apps-meet/google/apps/meet_v2beta/services/conference_records_service/transports/grpc_asyncio.py
@@ -168,7 +168,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-apps-meet/google/apps/meet_v2beta/services/spaces_service/transports/base.py b/packages/google-apps-meet/google/apps/meet_v2beta/services/spaces_service/transports/base.py
index 4b29671b9854..2b61146aef38 100644
--- a/packages/google-apps-meet/google/apps/meet_v2beta/services/spaces_service/transports/base.py
+++ b/packages/google-apps-meet/google/apps/meet_v2beta/services/spaces_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-apps-meet/google/apps/meet_v2beta/services/spaces_service/transports/grpc.py b/packages/google-apps-meet/google/apps/meet_v2beta/services/spaces_service/transports/grpc.py
index 13736ca0cd32..95889335d306 100644
--- a/packages/google-apps-meet/google/apps/meet_v2beta/services/spaces_service/transports/grpc.py
+++ b/packages/google-apps-meet/google/apps/meet_v2beta/services/spaces_service/transports/grpc.py
@@ -122,7 +122,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-apps-meet/google/apps/meet_v2beta/services/spaces_service/transports/grpc_asyncio.py b/packages/google-apps-meet/google/apps/meet_v2beta/services/spaces_service/transports/grpc_asyncio.py
index 22388cf4d1f7..0e05490d5db3 100644
--- a/packages/google-apps-meet/google/apps/meet_v2beta/services/spaces_service/transports/grpc_asyncio.py
+++ b/packages/google-apps-meet/google/apps/meet_v2beta/services/spaces_service/transports/grpc_asyncio.py
@@ -169,7 +169,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-apps-meet/noxfile.py b/packages/google-apps-meet/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-apps-meet/noxfile.py
+++ b/packages/google-apps-meet/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-apps-meet/setup.py b/packages/google-apps-meet/setup.py
index 85408dcf43ce..bf49680ebc74 100644
--- a/packages/google-apps-meet/setup.py
+++ b/packages/google-apps-meet/setup.py
@@ -44,7 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-apps-meet"
 
diff --git a/packages/google-apps-meet/testing/constraints-3.7.txt b/packages/google-apps-meet/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-apps-meet/testing/constraints-3.7.txt
+++ b/packages/google-apps-meet/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-apps-meet/tests/unit/gapic/meet_v2/test_conference_records_service.py b/packages/google-apps-meet/tests/unit/gapic/meet_v2/test_conference_records_service.py
index 8407eab0d994..70f7680b7ff8 100644
--- a/packages/google-apps-meet/tests/unit/gapic/meet_v2/test_conference_records_service.py
+++ b/packages/google-apps-meet/tests/unit/gapic/meet_v2/test_conference_records_service.py
@@ -1378,12 +1378,7 @@ async def test_get_conference_record_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_conference_record
         ] = mock_object
@@ -1774,12 +1769,7 @@ async def test_list_conference_records_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_conference_records
         ] = mock_object
@@ -2197,12 +2187,7 @@ async def test_get_participant_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_participant
         ] = mock_object
@@ -2583,12 +2568,7 @@ async def test_list_participants_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_participants
         ] = mock_object
@@ -3175,12 +3155,7 @@ async def test_get_participant_session_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_participant_session
         ] = mock_object
@@ -3571,12 +3546,7 @@ async def test_list_participant_sessions_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_participant_sessions
         ] = mock_object
@@ -4151,12 +4121,7 @@ async def test_get_recording_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_recording
         ] = mock_object
@@ -4520,12 +4485,7 @@ async def test_list_recordings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_recordings
         ] = mock_object
@@ -5082,12 +5042,7 @@ async def test_get_transcript_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_transcript
         ] = mock_object
@@ -5453,12 +5408,7 @@ async def test_list_transcripts_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_transcripts
         ] = mock_object
@@ -6033,12 +5983,7 @@ async def test_get_transcript_entry_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_transcript_entry
         ] = mock_object
@@ -6433,12 +6378,7 @@ async def test_list_transcript_entries_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_transcript_entries
         ] = mock_object
diff --git a/packages/google-apps-meet/tests/unit/gapic/meet_v2/test_spaces_service.py b/packages/google-apps-meet/tests/unit/gapic/meet_v2/test_spaces_service.py
index 71121c7aa84a..684fb3b82ce3 100644
--- a/packages/google-apps-meet/tests/unit/gapic/meet_v2/test_spaces_service.py
+++ b/packages/google-apps-meet/tests/unit/gapic/meet_v2/test_spaces_service.py
@@ -1281,12 +1281,7 @@ async def test_create_space_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_space
         ] = mock_object
@@ -1595,12 +1590,7 @@ async def test_get_space_async_use_cached_wrapped_rpc(transport: str = "grpc_asy
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_space
         ] = mock_object
@@ -1966,12 +1956,7 @@ async def test_update_space_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_space
         ] = mock_object
@@ -2351,12 +2336,7 @@ async def test_end_active_conference_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.end_active_conference
         ] = mock_object
diff --git a/packages/google-apps-meet/tests/unit/gapic/meet_v2beta/test_conference_records_service.py b/packages/google-apps-meet/tests/unit/gapic/meet_v2beta/test_conference_records_service.py
index fd62f9332932..341382e46f31 100644
--- a/packages/google-apps-meet/tests/unit/gapic/meet_v2beta/test_conference_records_service.py
+++ b/packages/google-apps-meet/tests/unit/gapic/meet_v2beta/test_conference_records_service.py
@@ -1375,12 +1375,7 @@ async def test_get_conference_record_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_conference_record
         ] = mock_object
@@ -1771,12 +1766,7 @@ async def test_list_conference_records_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_conference_records
         ] = mock_object
@@ -2194,12 +2184,7 @@ async def test_get_participant_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_participant
         ] = mock_object
@@ -2580,12 +2565,7 @@ async def test_list_participants_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_participants
         ] = mock_object
@@ -3172,12 +3152,7 @@ async def test_get_participant_session_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_participant_session
         ] = mock_object
@@ -3568,12 +3543,7 @@ async def test_list_participant_sessions_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_participant_sessions
         ] = mock_object
@@ -4148,12 +4118,7 @@ async def test_get_recording_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_recording
         ] = mock_object
@@ -4517,12 +4482,7 @@ async def test_list_recordings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_recordings
         ] = mock_object
@@ -5079,12 +5039,7 @@ async def test_get_transcript_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_transcript
         ] = mock_object
@@ -5450,12 +5405,7 @@ async def test_list_transcripts_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_transcripts
         ] = mock_object
@@ -6030,12 +5980,7 @@ async def test_get_transcript_entry_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_transcript_entry
         ] = mock_object
@@ -6430,12 +6375,7 @@ async def test_list_transcript_entries_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_transcript_entries
         ] = mock_object
diff --git a/packages/google-apps-meet/tests/unit/gapic/meet_v2beta/test_spaces_service.py b/packages/google-apps-meet/tests/unit/gapic/meet_v2beta/test_spaces_service.py
index 32ac27b2ed36..cfe855dcc0e0 100644
--- a/packages/google-apps-meet/tests/unit/gapic/meet_v2beta/test_spaces_service.py
+++ b/packages/google-apps-meet/tests/unit/gapic/meet_v2beta/test_spaces_service.py
@@ -1278,12 +1278,7 @@ async def test_create_space_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_space
         ] = mock_object
@@ -1592,12 +1587,7 @@ async def test_get_space_async_use_cached_wrapped_rpc(transport: str = "grpc_asy
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_space
         ] = mock_object
@@ -1963,12 +1953,7 @@ async def test_update_space_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_space
         ] = mock_object
@@ -2348,12 +2333,7 @@ async def test_end_active_conference_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.end_active_conference
         ] = mock_object
diff --git a/packages/google-area120-tables/google/area120/tables_v1alpha1/services/tables_service/transports/base.py b/packages/google-area120-tables/google/area120/tables_v1alpha1/services/tables_service/transports/base.py
index f2a9fa20303a..6a13683a01ba 100644
--- a/packages/google-area120-tables/google/area120/tables_v1alpha1/services/tables_service/transports/base.py
+++ b/packages/google-area120-tables/google/area120/tables_v1alpha1/services/tables_service/transports/base.py
@@ -89,6 +89,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -101,7 +103,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-area120-tables/google/area120/tables_v1alpha1/services/tables_service/transports/grpc.py b/packages/google-area120-tables/google/area120/tables_v1alpha1/services/tables_service/transports/grpc.py
index 8a4a375f520a..a9ac04d8e317 100644
--- a/packages/google-area120-tables/google/area120/tables_v1alpha1/services/tables_service/transports/grpc.py
+++ b/packages/google-area120-tables/google/area120/tables_v1alpha1/services/tables_service/transports/grpc.py
@@ -135,7 +135,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-area120-tables/google/area120/tables_v1alpha1/services/tables_service/transports/grpc_asyncio.py b/packages/google-area120-tables/google/area120/tables_v1alpha1/services/tables_service/transports/grpc_asyncio.py
index 51580564a9d7..a9f679a9915d 100644
--- a/packages/google-area120-tables/google/area120/tables_v1alpha1/services/tables_service/transports/grpc_asyncio.py
+++ b/packages/google-area120-tables/google/area120/tables_v1alpha1/services/tables_service/transports/grpc_asyncio.py
@@ -182,7 +182,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-area120-tables/noxfile.py b/packages/google-area120-tables/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-area120-tables/noxfile.py
+++ b/packages/google-area120-tables/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-area120-tables/setup.py b/packages/google-area120-tables/setup.py
index b42b248c0ef0..aded57bcd78e 100644
--- a/packages/google-area120-tables/setup.py
+++ b/packages/google-area120-tables/setup.py
@@ -44,7 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-area120-tables"
 
diff --git a/packages/google-area120-tables/testing/constraints-3.7.txt b/packages/google-area120-tables/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-area120-tables/testing/constraints-3.7.txt
+++ b/packages/google-area120-tables/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-area120-tables/tests/unit/gapic/tables_v1alpha1/test_tables_service.py b/packages/google-area120-tables/tests/unit/gapic/tables_v1alpha1/test_tables_service.py
index 1b00d66422f9..290914c56fc5 100644
--- a/packages/google-area120-tables/tests/unit/gapic/tables_v1alpha1/test_tables_service.py
+++ b/packages/google-area120-tables/tests/unit/gapic/tables_v1alpha1/test_tables_service.py
@@ -1286,12 +1286,7 @@ async def test_get_table_async_use_cached_wrapped_rpc(transport: str = "grpc_asy
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_table
         ] = mock_object
@@ -1653,12 +1648,7 @@ async def test_list_tables_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_tables
         ] = mock_object
@@ -2069,12 +2059,7 @@ async def test_get_workspace_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_workspace
         ] = mock_object
@@ -2436,12 +2421,7 @@ async def test_list_workspaces_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_workspaces
         ] = mock_object
@@ -2847,12 +2827,7 @@ async def test_get_row_async_use_cached_wrapped_rpc(transport: str = "grpc_async
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_row
         ] = mock_object
@@ -3214,12 +3189,7 @@ async def test_list_rows_async_use_cached_wrapped_rpc(transport: str = "grpc_asy
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_rows
         ] = mock_object
@@ -3771,12 +3741,7 @@ async def test_create_row_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_row
         ] = mock_object
@@ -4151,12 +4116,7 @@ async def test_batch_create_rows_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_create_rows
         ] = mock_object
@@ -4435,12 +4395,7 @@ async def test_update_row_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_row
         ] = mock_object
@@ -4815,12 +4770,7 @@ async def test_batch_update_rows_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_update_rows
         ] = mock_object
@@ -5096,12 +5046,7 @@ async def test_delete_row_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_row
         ] = mock_object
@@ -5459,12 +5404,7 @@ async def test_batch_delete_rows_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_delete_rows
         ] = mock_object
diff --git a/packages/google-cloud-access-approval/README.rst b/packages/google-cloud-access-approval/README.rst
index 99db3d967761..ecea6dd8a5c7 100644
--- a/packages/google-cloud-access-approval/README.rst
+++ b/packages/google-cloud-access-approval/README.rst
@@ -15,7 +15,7 @@ Python Client for Access Approval
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-access-approval.svg
    :target: https://pypi.org/project/google-cloud-access-approval/
 .. _Access Approval: https://cloud.google.com/access-approval
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/accessapproval/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/accessapproval/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/access-approval
 
 Quick Start
diff --git a/packages/google-cloud-access-approval/docs/index.rst b/packages/google-cloud-access-approval/docs/index.rst
index c6eb83257465..9bf09cbbfe1d 100644
--- a/packages/google-cloud-access-approval/docs/index.rst
+++ b/packages/google-cloud-access-approval/docs/index.rst
@@ -21,3 +21,8 @@ For a list of all ``google-cloud-access-approval`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-access-approval/docs/summary_overview.md b/packages/google-cloud-access-approval/docs/summary_overview.md
new file mode 100644
index 000000000000..6d26abe434bb
--- /dev/null
+++ b/packages/google-cloud-access-approval/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# Access Approval API
+
+Overview of the APIs available for Access Approval API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+Access Approval API.
+
+[classes](https://cloud.google.com/python/docs/reference/accessapproval/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/accessapproval/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/accessapproval/latest/summary_property.html)
diff --git a/packages/google-cloud-access-approval/google/cloud/accessapproval_v1/services/access_approval/transports/base.py b/packages/google-cloud-access-approval/google/cloud/accessapproval_v1/services/access_approval/transports/base.py
index 7dbbe10ec24a..afca639c5e6d 100644
--- a/packages/google-cloud-access-approval/google/cloud/accessapproval_v1/services/access_approval/transports/base.py
+++ b/packages/google-cloud-access-approval/google/cloud/accessapproval_v1/services/access_approval/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-access-approval/google/cloud/accessapproval_v1/services/access_approval/transports/grpc.py b/packages/google-cloud-access-approval/google/cloud/accessapproval_v1/services/access_approval/transports/grpc.py
index 70cf3394a3f4..05273b69663b 100644
--- a/packages/google-cloud-access-approval/google/cloud/accessapproval_v1/services/access_approval/transports/grpc.py
+++ b/packages/google-cloud-access-approval/google/cloud/accessapproval_v1/services/access_approval/transports/grpc.py
@@ -156,7 +156,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-access-approval/google/cloud/accessapproval_v1/services/access_approval/transports/grpc_asyncio.py b/packages/google-cloud-access-approval/google/cloud/accessapproval_v1/services/access_approval/transports/grpc_asyncio.py
index a73403289fe4..9d5ca469f469 100644
--- a/packages/google-cloud-access-approval/google/cloud/accessapproval_v1/services/access_approval/transports/grpc_asyncio.py
+++ b/packages/google-cloud-access-approval/google/cloud/accessapproval_v1/services/access_approval/transports/grpc_asyncio.py
@@ -203,7 +203,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-access-approval/noxfile.py b/packages/google-cloud-access-approval/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-access-approval/noxfile.py
+++ b/packages/google-cloud-access-approval/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-access-approval/setup.py b/packages/google-cloud-access-approval/setup.py
index c7e00e164071..f77dcac7fd92 100644
--- a/packages/google-cloud-access-approval/setup.py
+++ b/packages/google-cloud-access-approval/setup.py
@@ -46,7 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-access-approval"
 
diff --git a/packages/google-cloud-access-approval/testing/constraints-3.7.txt b/packages/google-cloud-access-approval/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-cloud-access-approval/testing/constraints-3.7.txt
+++ b/packages/google-cloud-access-approval/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-cloud-access-approval/tests/unit/gapic/accessapproval_v1/test_access_approval.py b/packages/google-cloud-access-approval/tests/unit/gapic/accessapproval_v1/test_access_approval.py
index 7cb8b234acf4..71fd48f99731 100644
--- a/packages/google-cloud-access-approval/tests/unit/gapic/accessapproval_v1/test_access_approval.py
+++ b/packages/google-cloud-access-approval/tests/unit/gapic/accessapproval_v1/test_access_approval.py
@@ -1299,12 +1299,7 @@ async def test_list_approval_requests_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_approval_requests
         ] = mock_object
@@ -1892,12 +1887,7 @@ async def test_get_approval_request_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_approval_request
         ] = mock_object
@@ -2290,12 +2280,7 @@ async def test_approve_approval_request_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.approve_approval_request
         ] = mock_object
@@ -2602,12 +2587,7 @@ async def test_dismiss_approval_request_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.dismiss_approval_request
         ] = mock_object
@@ -2914,12 +2894,7 @@ async def test_invalidate_approval_request_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.invalidate_approval_request
         ] = mock_object
@@ -3238,12 +3213,7 @@ async def test_get_access_approval_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_access_approval_settings
         ] = mock_object
@@ -3652,12 +3622,7 @@ async def test_update_access_approval_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_access_approval_settings
         ] = mock_object
@@ -4058,12 +4023,7 @@ async def test_delete_access_approval_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_access_approval_settings
         ] = mock_object
@@ -4445,12 +4405,7 @@ async def test_get_access_approval_service_account_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_access_approval_service_account
         ] = mock_object
diff --git a/packages/google-cloud-advisorynotifications/README.rst b/packages/google-cloud-advisorynotifications/README.rst
index bbab2f29ab96..a726d503f044 100644
--- a/packages/google-cloud-advisorynotifications/README.rst
+++ b/packages/google-cloud-advisorynotifications/README.rst
@@ -15,7 +15,7 @@ Python Client for Advisory Notifications
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-advisorynotifications.svg
    :target: https://pypi.org/project/google-cloud-advisorynotifications/
 .. _Advisory Notifications: https://cloud.google.com/advisory-notifications/
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/advisorynotifications/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/advisorynotifications/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/advisory-notifications/
 
 Quick Start
diff --git a/packages/google-cloud-advisorynotifications/docs/index.rst b/packages/google-cloud-advisorynotifications/docs/index.rst
index 3e963bbd9e83..d1709c7d49ab 100644
--- a/packages/google-cloud-advisorynotifications/docs/index.rst
+++ b/packages/google-cloud-advisorynotifications/docs/index.rst
@@ -21,3 +21,8 @@ For a list of all ``google-cloud-advisorynotifications`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-advisorynotifications/docs/summary_overview.md b/packages/google-cloud-advisorynotifications/docs/summary_overview.md
new file mode 100644
index 000000000000..cdddb144637e
--- /dev/null
+++ b/packages/google-cloud-advisorynotifications/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# Advisory Notifications API
+
+Overview of the APIs available for Advisory Notifications API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+Advisory Notifications API.
+
+[classes](https://cloud.google.com/python/docs/reference/advisorynotifications/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/advisorynotifications/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/advisorynotifications/latest/summary_property.html)
diff --git a/packages/google-cloud-advisorynotifications/google/cloud/advisorynotifications_v1/services/advisory_notifications_service/transports/base.py b/packages/google-cloud-advisorynotifications/google/cloud/advisorynotifications_v1/services/advisory_notifications_service/transports/base.py
index e0a8c53b13d7..20c7fd56c0a3 100644
--- a/packages/google-cloud-advisorynotifications/google/cloud/advisorynotifications_v1/services/advisory_notifications_service/transports/base.py
+++ b/packages/google-cloud-advisorynotifications/google/cloud/advisorynotifications_v1/services/advisory_notifications_service/transports/base.py
@@ -81,6 +81,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -93,7 +95,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-advisorynotifications/google/cloud/advisorynotifications_v1/services/advisory_notifications_service/transports/grpc.py b/packages/google-cloud-advisorynotifications/google/cloud/advisorynotifications_v1/services/advisory_notifications_service/transports/grpc.py
index 51e087a9d0e8..7208a5d153a5 100644
--- a/packages/google-cloud-advisorynotifications/google/cloud/advisorynotifications_v1/services/advisory_notifications_service/transports/grpc.py
+++ b/packages/google-cloud-advisorynotifications/google/cloud/advisorynotifications_v1/services/advisory_notifications_service/transports/grpc.py
@@ -121,7 +121,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-advisorynotifications/google/cloud/advisorynotifications_v1/services/advisory_notifications_service/transports/grpc_asyncio.py b/packages/google-cloud-advisorynotifications/google/cloud/advisorynotifications_v1/services/advisory_notifications_service/transports/grpc_asyncio.py
index 375686d64d2c..b92751585ff7 100644
--- a/packages/google-cloud-advisorynotifications/google/cloud/advisorynotifications_v1/services/advisory_notifications_service/transports/grpc_asyncio.py
+++ b/packages/google-cloud-advisorynotifications/google/cloud/advisorynotifications_v1/services/advisory_notifications_service/transports/grpc_asyncio.py
@@ -170,7 +170,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-advisorynotifications/noxfile.py b/packages/google-cloud-advisorynotifications/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-advisorynotifications/noxfile.py
+++ b/packages/google-cloud-advisorynotifications/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-advisorynotifications/setup.py b/packages/google-cloud-advisorynotifications/setup.py
index 4fbff2f29227..8d47be4611aa 100644
--- a/packages/google-cloud-advisorynotifications/setup.py
+++ b/packages/google-cloud-advisorynotifications/setup.py
@@ -46,7 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-advisorynotifications"
 
diff --git a/packages/google-cloud-advisorynotifications/testing/constraints-3.7.txt b/packages/google-cloud-advisorynotifications/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-cloud-advisorynotifications/testing/constraints-3.7.txt
+++ b/packages/google-cloud-advisorynotifications/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-cloud-advisorynotifications/tests/unit/gapic/advisorynotifications_v1/test_advisory_notifications_service.py b/packages/google-cloud-advisorynotifications/tests/unit/gapic/advisorynotifications_v1/test_advisory_notifications_service.py
index c340440e6004..fceb072bda8e 100644
--- a/packages/google-cloud-advisorynotifications/tests/unit/gapic/advisorynotifications_v1/test_advisory_notifications_service.py
+++ b/packages/google-cloud-advisorynotifications/tests/unit/gapic/advisorynotifications_v1/test_advisory_notifications_service.py
@@ -1392,12 +1392,7 @@ async def test_list_notifications_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_notifications
         ] = mock_object
@@ -1981,12 +1976,7 @@ async def test_get_notification_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_notification
         ] = mock_object
@@ -2358,12 +2348,7 @@ async def test_get_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_settings
         ] = mock_object
@@ -2724,12 +2709,7 @@ async def test_update_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_settings
         ] = mock_object
diff --git a/packages/google-cloud-alloydb/google/cloud/alloydb_v1/services/alloy_db_admin/transports/base.py b/packages/google-cloud-alloydb/google/cloud/alloydb_v1/services/alloy_db_admin/transports/base.py
index fb821bcbd0be..b0d8e7d8183d 100644
--- a/packages/google-cloud-alloydb/google/cloud/alloydb_v1/services/alloy_db_admin/transports/base.py
+++ b/packages/google-cloud-alloydb/google/cloud/alloydb_v1/services/alloy_db_admin/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-alloydb/google/cloud/alloydb_v1/services/alloy_db_admin/transports/grpc.py b/packages/google-cloud-alloydb/google/cloud/alloydb_v1/services/alloy_db_admin/transports/grpc.py
index a99df0a9215a..03c101689e49 100644
--- a/packages/google-cloud-alloydb/google/cloud/alloydb_v1/services/alloy_db_admin/transports/grpc.py
+++ b/packages/google-cloud-alloydb/google/cloud/alloydb_v1/services/alloy_db_admin/transports/grpc.py
@@ -127,7 +127,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-alloydb/google/cloud/alloydb_v1/services/alloy_db_admin/transports/grpc_asyncio.py b/packages/google-cloud-alloydb/google/cloud/alloydb_v1/services/alloy_db_admin/transports/grpc_asyncio.py
index 45e16173b4c9..9d165f839524 100644
--- a/packages/google-cloud-alloydb/google/cloud/alloydb_v1/services/alloy_db_admin/transports/grpc_asyncio.py
+++ b/packages/google-cloud-alloydb/google/cloud/alloydb_v1/services/alloy_db_admin/transports/grpc_asyncio.py
@@ -174,7 +174,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-alloydb/google/cloud/alloydb_v1alpha/services/alloy_db_admin/transports/base.py b/packages/google-cloud-alloydb/google/cloud/alloydb_v1alpha/services/alloy_db_admin/transports/base.py
index a6d3a429024b..d9139d60f396 100644
--- a/packages/google-cloud-alloydb/google/cloud/alloydb_v1alpha/services/alloy_db_admin/transports/base.py
+++ b/packages/google-cloud-alloydb/google/cloud/alloydb_v1alpha/services/alloy_db_admin/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-alloydb/google/cloud/alloydb_v1alpha/services/alloy_db_admin/transports/grpc.py b/packages/google-cloud-alloydb/google/cloud/alloydb_v1alpha/services/alloy_db_admin/transports/grpc.py
index aa2d9ab1eb11..fa16dde182e4 100644
--- a/packages/google-cloud-alloydb/google/cloud/alloydb_v1alpha/services/alloy_db_admin/transports/grpc.py
+++ b/packages/google-cloud-alloydb/google/cloud/alloydb_v1alpha/services/alloy_db_admin/transports/grpc.py
@@ -127,7 +127,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-alloydb/google/cloud/alloydb_v1alpha/services/alloy_db_admin/transports/grpc_asyncio.py b/packages/google-cloud-alloydb/google/cloud/alloydb_v1alpha/services/alloy_db_admin/transports/grpc_asyncio.py
index c95a2409b772..2c1723340a8b 100644
--- a/packages/google-cloud-alloydb/google/cloud/alloydb_v1alpha/services/alloy_db_admin/transports/grpc_asyncio.py
+++ b/packages/google-cloud-alloydb/google/cloud/alloydb_v1alpha/services/alloy_db_admin/transports/grpc_asyncio.py
@@ -174,7 +174,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-alloydb/google/cloud/alloydb_v1beta/services/alloy_db_admin/transports/base.py b/packages/google-cloud-alloydb/google/cloud/alloydb_v1beta/services/alloy_db_admin/transports/base.py
index 3ae422845505..05fa0dddb826 100644
--- a/packages/google-cloud-alloydb/google/cloud/alloydb_v1beta/services/alloy_db_admin/transports/base.py
+++ b/packages/google-cloud-alloydb/google/cloud/alloydb_v1beta/services/alloy_db_admin/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-alloydb/google/cloud/alloydb_v1beta/services/alloy_db_admin/transports/grpc.py b/packages/google-cloud-alloydb/google/cloud/alloydb_v1beta/services/alloy_db_admin/transports/grpc.py
index 2d7aa8fc2734..8122bea7f5b1 100644
--- a/packages/google-cloud-alloydb/google/cloud/alloydb_v1beta/services/alloy_db_admin/transports/grpc.py
+++ b/packages/google-cloud-alloydb/google/cloud/alloydb_v1beta/services/alloy_db_admin/transports/grpc.py
@@ -127,7 +127,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-alloydb/google/cloud/alloydb_v1beta/services/alloy_db_admin/transports/grpc_asyncio.py b/packages/google-cloud-alloydb/google/cloud/alloydb_v1beta/services/alloy_db_admin/transports/grpc_asyncio.py
index e7ab58a3a549..42f6874b1a44 100644
--- a/packages/google-cloud-alloydb/google/cloud/alloydb_v1beta/services/alloy_db_admin/transports/grpc_asyncio.py
+++ b/packages/google-cloud-alloydb/google/cloud/alloydb_v1beta/services/alloy_db_admin/transports/grpc_asyncio.py
@@ -174,7 +174,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-alloydb/setup.py b/packages/google-cloud-alloydb/setup.py
index dacd15419488..0affa2bc1ec3 100644
--- a/packages/google-cloud-alloydb/setup.py
+++ b/packages/google-cloud-alloydb/setup.py
@@ -44,7 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
     "grpc-google-iam-v1 >= 0.12.4, <1.0.0dev",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-alloydb"
diff --git a/packages/google-cloud-alloydb/testing/constraints-3.7.txt b/packages/google-cloud-alloydb/testing/constraints-3.7.txt
index 4cd2782277d4..a81fb6bcd05c 100644
--- a/packages/google-cloud-alloydb/testing/constraints-3.7.txt
+++ b/packages/google-cloud-alloydb/testing/constraints-3.7.txt
@@ -7,5 +7,5 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
 grpc-google-iam-v1==0.12.4
diff --git a/packages/google-cloud-alloydb/tests/unit/gapic/alloydb_v1/test_alloy_db_admin.py b/packages/google-cloud-alloydb/tests/unit/gapic/alloydb_v1/test_alloy_db_admin.py
index ce5a1b329b5e..d403e0ba140a 100644
--- a/packages/google-cloud-alloydb/tests/unit/gapic/alloydb_v1/test_alloy_db_admin.py
+++ b/packages/google-cloud-alloydb/tests/unit/gapic/alloydb_v1/test_alloy_db_admin.py
@@ -1286,12 +1286,7 @@ async def test_list_clusters_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_clusters
         ] = mock_object
@@ -1871,12 +1866,7 @@ async def test_get_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_cluster
         ] = mock_object
@@ -2255,12 +2245,7 @@ async def test_create_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_cluster
         ] = mock_object
@@ -2656,12 +2641,7 @@ async def test_update_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_cluster
         ] = mock_object
@@ -3051,12 +3031,7 @@ async def test_delete_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_cluster
         ] = mock_object
@@ -3424,12 +3399,7 @@ async def test_promote_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.promote_cluster
         ] = mock_object
@@ -3797,12 +3767,7 @@ async def test_restore_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.restore_cluster
         ] = mock_object
@@ -4101,12 +4066,7 @@ async def test_create_secondary_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_secondary_cluster
         ] = mock_object
@@ -4522,12 +4482,7 @@ async def test_list_instances_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_instances
         ] = mock_object
@@ -5110,12 +5065,7 @@ async def test_get_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_instance
         ] = mock_object
@@ -5496,12 +5446,7 @@ async def test_create_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_instance
         ] = mock_object
@@ -5902,12 +5847,7 @@ async def test_create_secondary_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_secondary_instance
         ] = mock_object
@@ -6316,12 +6256,7 @@ async def test_batch_create_instances_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_create_instances
         ] = mock_object
@@ -6609,12 +6544,7 @@ async def test_update_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_instance
         ] = mock_object
@@ -6992,12 +6922,7 @@ async def test_delete_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_instance
         ] = mock_object
@@ -7373,12 +7298,7 @@ async def test_failover_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.failover_instance
         ] = mock_object
@@ -7754,12 +7674,7 @@ async def test_inject_fault_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.inject_fault
         ] = mock_object
@@ -8137,12 +8052,7 @@ async def test_restart_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.restart_instance
         ] = mock_object
@@ -8516,12 +8426,7 @@ async def test_list_backups_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_backups
         ] = mock_object
@@ -9108,12 +9013,7 @@ async def test_get_backup_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_backup
         ] = mock_object
@@ -9498,12 +9398,7 @@ async def test_create_backup_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_backup
         ] = mock_object
@@ -9887,12 +9782,7 @@ async def test_update_backup_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_backup
         ] = mock_object
@@ -10270,12 +10160,7 @@ async def test_delete_backup_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_backup
         ] = mock_object
@@ -10655,12 +10540,7 @@ async def test_list_supported_database_flags_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_supported_database_flags
         ] = mock_object
@@ -11253,12 +11133,7 @@ async def test_generate_client_certificate_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.generate_client_certificate
         ] = mock_object
@@ -11655,12 +11530,7 @@ async def test_get_connection_info_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_connection_info
         ] = mock_object
@@ -12045,12 +11915,7 @@ async def test_list_users_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_users
         ] = mock_object
@@ -12613,12 +12478,7 @@ async def test_get_user_async_use_cached_wrapped_rpc(transport: str = "grpc_asyn
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_user
         ] = mock_object
@@ -12997,12 +12857,7 @@ async def test_create_user_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_user
         ] = mock_object
@@ -13397,12 +13252,7 @@ async def test_update_user_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_user
         ] = mock_object
@@ -13773,12 +13623,7 @@ async def test_delete_user_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_user
         ] = mock_object
diff --git a/packages/google-cloud-alloydb/tests/unit/gapic/alloydb_v1alpha/test_alloy_db_admin.py b/packages/google-cloud-alloydb/tests/unit/gapic/alloydb_v1alpha/test_alloy_db_admin.py
index b5707760ee55..418d036fcbac 100644
--- a/packages/google-cloud-alloydb/tests/unit/gapic/alloydb_v1alpha/test_alloy_db_admin.py
+++ b/packages/google-cloud-alloydb/tests/unit/gapic/alloydb_v1alpha/test_alloy_db_admin.py
@@ -1286,12 +1286,7 @@ async def test_list_clusters_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_clusters
         ] = mock_object
@@ -1877,12 +1872,7 @@ async def test_get_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_cluster
         ] = mock_object
@@ -2265,12 +2255,7 @@ async def test_create_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_cluster
         ] = mock_object
@@ -2666,12 +2651,7 @@ async def test_update_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_cluster
         ] = mock_object
@@ -3061,12 +3041,7 @@ async def test_delete_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_cluster
         ] = mock_object
@@ -3434,12 +3409,7 @@ async def test_promote_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.promote_cluster
         ] = mock_object
@@ -3807,12 +3777,7 @@ async def test_restore_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.restore_cluster
         ] = mock_object
@@ -4111,12 +4076,7 @@ async def test_create_secondary_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_secondary_cluster
         ] = mock_object
@@ -4532,12 +4492,7 @@ async def test_list_instances_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_instances
         ] = mock_object
@@ -5129,12 +5084,7 @@ async def test_get_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_instance
         ] = mock_object
@@ -5521,12 +5471,7 @@ async def test_create_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_instance
         ] = mock_object
@@ -5927,12 +5872,7 @@ async def test_create_secondary_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_secondary_instance
         ] = mock_object
@@ -6341,12 +6281,7 @@ async def test_batch_create_instances_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_create_instances
         ] = mock_object
@@ -6634,12 +6569,7 @@ async def test_update_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_instance
         ] = mock_object
@@ -7017,12 +6947,7 @@ async def test_delete_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_instance
         ] = mock_object
@@ -7398,12 +7323,7 @@ async def test_failover_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.failover_instance
         ] = mock_object
@@ -7779,12 +7699,7 @@ async def test_inject_fault_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.inject_fault
         ] = mock_object
@@ -8162,12 +8077,7 @@ async def test_restart_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.restart_instance
         ] = mock_object
@@ -8541,12 +8451,7 @@ async def test_list_backups_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_backups
         ] = mock_object
@@ -9139,12 +9044,7 @@ async def test_get_backup_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_backup
         ] = mock_object
@@ -9533,12 +9433,7 @@ async def test_create_backup_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_backup
         ] = mock_object
@@ -9922,12 +9817,7 @@ async def test_update_backup_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_backup
         ] = mock_object
@@ -10305,12 +10195,7 @@ async def test_delete_backup_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_backup
         ] = mock_object
@@ -10690,12 +10575,7 @@ async def test_list_supported_database_flags_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_supported_database_flags
         ] = mock_object
@@ -11293,12 +11173,7 @@ async def test_generate_client_certificate_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.generate_client_certificate
         ] = mock_object
@@ -11706,12 +11581,7 @@ async def test_get_connection_info_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_connection_info
         ] = mock_object
@@ -12102,12 +11972,7 @@ async def test_list_users_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_users
         ] = mock_object
@@ -12670,12 +12535,7 @@ async def test_get_user_async_use_cached_wrapped_rpc(transport: str = "grpc_asyn
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_user
         ] = mock_object
@@ -13054,12 +12914,7 @@ async def test_create_user_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_user
         ] = mock_object
@@ -13454,12 +13309,7 @@ async def test_update_user_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_user
         ] = mock_object
@@ -13830,12 +13680,7 @@ async def test_delete_user_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_user
         ] = mock_object
@@ -14194,12 +14039,7 @@ async def test_list_databases_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_databases
         ] = mock_object
diff --git a/packages/google-cloud-alloydb/tests/unit/gapic/alloydb_v1beta/test_alloy_db_admin.py b/packages/google-cloud-alloydb/tests/unit/gapic/alloydb_v1beta/test_alloy_db_admin.py
index 983259a9e6f2..5b6d0ad8f7d1 100644
--- a/packages/google-cloud-alloydb/tests/unit/gapic/alloydb_v1beta/test_alloy_db_admin.py
+++ b/packages/google-cloud-alloydb/tests/unit/gapic/alloydb_v1beta/test_alloy_db_admin.py
@@ -1286,12 +1286,7 @@ async def test_list_clusters_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_clusters
         ] = mock_object
@@ -1874,12 +1869,7 @@ async def test_get_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_cluster
         ] = mock_object
@@ -2260,12 +2250,7 @@ async def test_create_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_cluster
         ] = mock_object
@@ -2661,12 +2646,7 @@ async def test_update_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_cluster
         ] = mock_object
@@ -3056,12 +3036,7 @@ async def test_delete_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_cluster
         ] = mock_object
@@ -3429,12 +3404,7 @@ async def test_promote_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.promote_cluster
         ] = mock_object
@@ -3802,12 +3772,7 @@ async def test_restore_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.restore_cluster
         ] = mock_object
@@ -4106,12 +4071,7 @@ async def test_create_secondary_cluster_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_secondary_cluster
         ] = mock_object
@@ -4527,12 +4487,7 @@ async def test_list_instances_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_instances
         ] = mock_object
@@ -5121,12 +5076,7 @@ async def test_get_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_instance
         ] = mock_object
@@ -5511,12 +5461,7 @@ async def test_create_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_instance
         ] = mock_object
@@ -5917,12 +5862,7 @@ async def test_create_secondary_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_secondary_instance
         ] = mock_object
@@ -6331,12 +6271,7 @@ async def test_batch_create_instances_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_create_instances
         ] = mock_object
@@ -6624,12 +6559,7 @@ async def test_update_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_instance
         ] = mock_object
@@ -7007,12 +6937,7 @@ async def test_delete_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_instance
         ] = mock_object
@@ -7388,12 +7313,7 @@ async def test_failover_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.failover_instance
         ] = mock_object
@@ -7769,12 +7689,7 @@ async def test_inject_fault_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.inject_fault
         ] = mock_object
@@ -8152,12 +8067,7 @@ async def test_restart_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.restart_instance
         ] = mock_object
@@ -8531,12 +8441,7 @@ async def test_list_backups_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_backups
         ] = mock_object
@@ -9126,12 +9031,7 @@ async def test_get_backup_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_backup
         ] = mock_object
@@ -9518,12 +9418,7 @@ async def test_create_backup_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_backup
         ] = mock_object
@@ -9907,12 +9802,7 @@ async def test_update_backup_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_backup
         ] = mock_object
@@ -10290,12 +10180,7 @@ async def test_delete_backup_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_backup
         ] = mock_object
@@ -10675,12 +10560,7 @@ async def test_list_supported_database_flags_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_supported_database_flags
         ] = mock_object
@@ -11278,12 +11158,7 @@ async def test_generate_client_certificate_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.generate_client_certificate
         ] = mock_object
@@ -11691,12 +11566,7 @@ async def test_get_connection_info_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_connection_info
         ] = mock_object
@@ -12087,12 +11957,7 @@ async def test_list_users_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_users
         ] = mock_object
@@ -12655,12 +12520,7 @@ async def test_get_user_async_use_cached_wrapped_rpc(transport: str = "grpc_asyn
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_user
         ] = mock_object
@@ -13039,12 +12899,7 @@ async def test_create_user_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_user
         ] = mock_object
@@ -13439,12 +13294,7 @@ async def test_update_user_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_user
         ] = mock_object
@@ -13815,12 +13665,7 @@ async def test_delete_user_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_user
         ] = mock_object
@@ -14179,12 +14024,7 @@ async def test_list_databases_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_databases
         ] = mock_object
diff --git a/packages/google-cloud-api-gateway/README.rst b/packages/google-cloud-api-gateway/README.rst
index ac66cc9bc021..833160e28bc2 100644
--- a/packages/google-cloud-api-gateway/README.rst
+++ b/packages/google-cloud-api-gateway/README.rst
@@ -15,7 +15,7 @@ Python Client for API Gateway
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-api-gateway.svg
    :target: https://pypi.org/project/google-cloud-api-gateway/
 .. _API Gateway: https://cloud.google.com/api-gateway
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/apigateway/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/apigateway/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/api-gateway
 
 Quick Start
diff --git a/packages/google-cloud-api-gateway/docs/index.rst b/packages/google-cloud-api-gateway/docs/index.rst
index b1ab9f977221..fb537760ae85 100644
--- a/packages/google-cloud-api-gateway/docs/index.rst
+++ b/packages/google-cloud-api-gateway/docs/index.rst
@@ -21,3 +21,8 @@ For a list of all ``google-cloud-api-gateway`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-api-gateway/docs/summary_overview.md b/packages/google-cloud-api-gateway/docs/summary_overview.md
new file mode 100644
index 000000000000..f8feab903cf9
--- /dev/null
+++ b/packages/google-cloud-api-gateway/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# API Gateway API
+
+Overview of the APIs available for API Gateway API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+API Gateway API.
+
+[classes](https://cloud.google.com/python/docs/reference/apigateway/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/apigateway/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/apigateway/latest/summary_property.html)
diff --git a/packages/google-cloud-api-gateway/google/cloud/apigateway_v1/services/api_gateway_service/transports/base.py b/packages/google-cloud-api-gateway/google/cloud/apigateway_v1/services/api_gateway_service/transports/base.py
index c9400f669c6b..1f8b6fd06304 100644
--- a/packages/google-cloud-api-gateway/google/cloud/apigateway_v1/services/api_gateway_service/transports/base.py
+++ b/packages/google-cloud-api-gateway/google/cloud/apigateway_v1/services/api_gateway_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-api-gateway/google/cloud/apigateway_v1/services/api_gateway_service/transports/grpc.py b/packages/google-cloud-api-gateway/google/cloud/apigateway_v1/services/api_gateway_service/transports/grpc.py
index b22ea5b8ff97..b00923f520ca 100644
--- a/packages/google-cloud-api-gateway/google/cloud/apigateway_v1/services/api_gateway_service/transports/grpc.py
+++ b/packages/google-cloud-api-gateway/google/cloud/apigateway_v1/services/api_gateway_service/transports/grpc.py
@@ -124,7 +124,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-api-gateway/google/cloud/apigateway_v1/services/api_gateway_service/transports/grpc_asyncio.py b/packages/google-cloud-api-gateway/google/cloud/apigateway_v1/services/api_gateway_service/transports/grpc_asyncio.py
index d33f3faea6cb..220574745597 100644
--- a/packages/google-cloud-api-gateway/google/cloud/apigateway_v1/services/api_gateway_service/transports/grpc_asyncio.py
+++ b/packages/google-cloud-api-gateway/google/cloud/apigateway_v1/services/api_gateway_service/transports/grpc_asyncio.py
@@ -171,7 +171,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-api-gateway/noxfile.py b/packages/google-cloud-api-gateway/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-api-gateway/noxfile.py
+++ b/packages/google-cloud-api-gateway/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-api-gateway/setup.py b/packages/google-cloud-api-gateway/setup.py
index 2f4adf61e884..f43780a9fae3 100644
--- a/packages/google-cloud-api-gateway/setup.py
+++ b/packages/google-cloud-api-gateway/setup.py
@@ -44,7 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-api-gateway"
 
diff --git a/packages/google-cloud-api-gateway/testing/constraints-3.7.txt b/packages/google-cloud-api-gateway/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-cloud-api-gateway/testing/constraints-3.7.txt
+++ b/packages/google-cloud-api-gateway/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-cloud-api-gateway/tests/unit/gapic/apigateway_v1/test_api_gateway_service.py b/packages/google-cloud-api-gateway/tests/unit/gapic/apigateway_v1/test_api_gateway_service.py
index 325bf4db1305..0591e5a93ec0 100644
--- a/packages/google-cloud-api-gateway/tests/unit/gapic/apigateway_v1/test_api_gateway_service.py
+++ b/packages/google-cloud-api-gateway/tests/unit/gapic/apigateway_v1/test_api_gateway_service.py
@@ -1340,12 +1340,7 @@ async def test_list_gateways_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_gateways
         ] = mock_object
@@ -1913,12 +1908,7 @@ async def test_get_gateway_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_gateway
         ] = mock_object
@@ -2287,12 +2277,7 @@ async def test_create_gateway_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_gateway
         ] = mock_object
@@ -2672,12 +2657,7 @@ async def test_update_gateway_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_gateway
         ] = mock_object
@@ -3051,12 +3031,7 @@ async def test_delete_gateway_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_gateway
         ] = mock_object
@@ -3428,12 +3403,7 @@ async def test_list_apis_async_use_cached_wrapped_rpc(transport: str = "grpc_asy
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_apis
         ] = mock_object
@@ -3996,12 +3966,7 @@ async def test_get_api_async_use_cached_wrapped_rpc(transport: str = "grpc_async
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_api
         ] = mock_object
@@ -4366,12 +4331,7 @@ async def test_create_api_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_api
         ] = mock_object
@@ -4749,12 +4709,7 @@ async def test_update_api_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_api
         ] = mock_object
@@ -5126,12 +5081,7 @@ async def test_delete_api_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_api
         ] = mock_object
@@ -5507,12 +5457,7 @@ async def test_list_api_configs_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_api_configs
         ] = mock_object
@@ -6080,12 +6025,7 @@ async def test_get_api_config_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_api_config
         ] = mock_object
@@ -6468,12 +6408,7 @@ async def test_create_api_config_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_api_config
         ] = mock_object
@@ -6873,12 +6808,7 @@ async def test_update_api_config_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_api_config
         ] = mock_object
@@ -7272,12 +7202,7 @@ async def test_delete_api_config_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_api_config
         ] = mock_object
diff --git a/packages/google-cloud-api-keys/README.rst b/packages/google-cloud-api-keys/README.rst
index 81129b39bc93..73ad9f58d7af 100644
--- a/packages/google-cloud-api-keys/README.rst
+++ b/packages/google-cloud-api-keys/README.rst
@@ -15,7 +15,7 @@ Python Client for API Keys
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-api-keys.svg
    :target: https://pypi.org/project/google-cloud-api-keys/
 .. _API Keys: https://cloud.google.com/api-keys/docs
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/apikeys/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/apikeys/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/api-keys/docs
 
 Quick Start
diff --git a/packages/google-cloud-api-keys/docs/index.rst b/packages/google-cloud-api-keys/docs/index.rst
index 8b4bff8bdc1d..7fbd26ca1dd2 100644
--- a/packages/google-cloud-api-keys/docs/index.rst
+++ b/packages/google-cloud-api-keys/docs/index.rst
@@ -21,3 +21,8 @@ For a list of all ``google-cloud-api-keys`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-api-keys/docs/summary_overview.md b/packages/google-cloud-api-keys/docs/summary_overview.md
new file mode 100644
index 000000000000..84165fc8640d
--- /dev/null
+++ b/packages/google-cloud-api-keys/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# API Keys API
+
+Overview of the APIs available for API Keys API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+API Keys API.
+
+[classes](https://cloud.google.com/python/docs/reference/apikeys/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/apikeys/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/apikeys/latest/summary_property.html)
diff --git a/packages/google-cloud-api-keys/google/cloud/api_keys_v2/services/api_keys/transports/base.py b/packages/google-cloud-api-keys/google/cloud/api_keys_v2/services/api_keys/transports/base.py
index 918be5cec075..e4ae6e658a18 100644
--- a/packages/google-cloud-api-keys/google/cloud/api_keys_v2/services/api_keys/transports/base.py
+++ b/packages/google-cloud-api-keys/google/cloud/api_keys_v2/services/api_keys/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-api-keys/google/cloud/api_keys_v2/services/api_keys/transports/grpc.py b/packages/google-cloud-api-keys/google/cloud/api_keys_v2/services/api_keys/transports/grpc.py
index daf3b4e6c495..d0c4f9ce1b1b 100644
--- a/packages/google-cloud-api-keys/google/cloud/api_keys_v2/services/api_keys/transports/grpc.py
+++ b/packages/google-cloud-api-keys/google/cloud/api_keys_v2/services/api_keys/transports/grpc.py
@@ -123,7 +123,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-api-keys/google/cloud/api_keys_v2/services/api_keys/transports/grpc_asyncio.py b/packages/google-cloud-api-keys/google/cloud/api_keys_v2/services/api_keys/transports/grpc_asyncio.py
index 737b52d2a891..3df81e24b2ac 100644
--- a/packages/google-cloud-api-keys/google/cloud/api_keys_v2/services/api_keys/transports/grpc_asyncio.py
+++ b/packages/google-cloud-api-keys/google/cloud/api_keys_v2/services/api_keys/transports/grpc_asyncio.py
@@ -170,7 +170,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-api-keys/noxfile.py b/packages/google-cloud-api-keys/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-api-keys/noxfile.py
+++ b/packages/google-cloud-api-keys/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-api-keys/setup.py b/packages/google-cloud-api-keys/setup.py
index a45168057287..a4cea80104a8 100644
--- a/packages/google-cloud-api-keys/setup.py
+++ b/packages/google-cloud-api-keys/setup.py
@@ -44,7 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-api-keys"
 
diff --git a/packages/google-cloud-api-keys/testing/constraints-3.7.txt b/packages/google-cloud-api-keys/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-cloud-api-keys/testing/constraints-3.7.txt
+++ b/packages/google-cloud-api-keys/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-cloud-api-keys/tests/unit/gapic/api_keys_v2/test_api_keys.py b/packages/google-cloud-api-keys/tests/unit/gapic/api_keys_v2/test_api_keys.py
index 87b9aaef5bfb..dc4f2bbd0db9 100644
--- a/packages/google-cloud-api-keys/tests/unit/gapic/api_keys_v2/test_api_keys.py
+++ b/packages/google-cloud-api-keys/tests/unit/gapic/api_keys_v2/test_api_keys.py
@@ -1230,12 +1230,7 @@ async def test_create_key_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_key
         ] = mock_object
@@ -1620,12 +1615,7 @@ async def test_list_keys_async_use_cached_wrapped_rpc(transport: str = "grpc_asy
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_keys
         ] = mock_object
@@ -2189,12 +2179,7 @@ async def test_get_key_async_use_cached_wrapped_rpc(transport: str = "grpc_async
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_key
         ] = mock_object
@@ -2562,12 +2547,7 @@ async def test_get_key_string_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_key_string
         ] = mock_object
@@ -2924,12 +2904,7 @@ async def test_update_key_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_key
         ] = mock_object
@@ -3303,12 +3278,7 @@ async def test_delete_key_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_key
         ] = mock_object
@@ -3672,12 +3642,7 @@ async def test_undelete_key_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.undelete_key
         ] = mock_object
@@ -3961,12 +3926,7 @@ async def test_lookup_key_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.lookup_key
         ] = mock_object
diff --git a/packages/google-cloud-apigee-connect/README.rst b/packages/google-cloud-apigee-connect/README.rst
index 1b33bf417ae6..235b6bee9f33 100644
--- a/packages/google-cloud-apigee-connect/README.rst
+++ b/packages/google-cloud-apigee-connect/README.rst
@@ -15,7 +15,7 @@ Python Client for Apigee Connect
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-apigee-connect.svg
    :target: https://pypi.org/project/google-cloud-apigee-connect/
 .. _Apigee Connect: https://cloud.google.com/apigee/docs/hybrid/v1.4/apigee-connect
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/apigeeconnect/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/apigeeconnect/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/apigee/docs/hybrid/v1.4/apigee-connect
 
 Quick Start
diff --git a/packages/google-cloud-apigee-connect/docs/index.rst b/packages/google-cloud-apigee-connect/docs/index.rst
index c15d7ee33501..a4d58c31b03f 100644
--- a/packages/google-cloud-apigee-connect/docs/index.rst
+++ b/packages/google-cloud-apigee-connect/docs/index.rst
@@ -21,3 +21,8 @@ For a list of all ``google-cloud-apigee-connect`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-apigee-connect/docs/summary_overview.md b/packages/google-cloud-apigee-connect/docs/summary_overview.md
new file mode 100644
index 000000000000..d28e61609bfc
--- /dev/null
+++ b/packages/google-cloud-apigee-connect/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# Apigee Connect API
+
+Overview of the APIs available for Apigee Connect API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+Apigee Connect API.
+
+[classes](https://cloud.google.com/python/docs/reference/apigeeconnect/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/apigeeconnect/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/apigeeconnect/latest/summary_property.html)
diff --git a/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/connection_service/transports/base.py b/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/connection_service/transports/base.py
index ae1563c4806c..2d7fd1cd121a 100644
--- a/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/connection_service/transports/base.py
+++ b/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/connection_service/transports/base.py
@@ -81,6 +81,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -93,7 +95,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/connection_service/transports/grpc.py b/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/connection_service/transports/grpc.py
index 71d781df900d..8a42da542443 100644
--- a/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/connection_service/transports/grpc.py
+++ b/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/connection_service/transports/grpc.py
@@ -122,7 +122,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/connection_service/transports/grpc_asyncio.py b/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/connection_service/transports/grpc_asyncio.py
index 05f8deb2ab45..c96bb2e83434 100644
--- a/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/connection_service/transports/grpc_asyncio.py
+++ b/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/connection_service/transports/grpc_asyncio.py
@@ -169,7 +169,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/tether/transports/base.py b/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/tether/transports/base.py
index a511ccc1a1f0..c1835021bfe9 100644
--- a/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/tether/transports/base.py
+++ b/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/tether/transports/base.py
@@ -81,6 +81,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -93,7 +95,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/tether/transports/grpc.py b/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/tether/transports/grpc.py
index 924b5a679be5..bdaea571a9fa 100644
--- a/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/tether/transports/grpc.py
+++ b/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/tether/transports/grpc.py
@@ -124,7 +124,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/tether/transports/grpc_asyncio.py b/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/tether/transports/grpc_asyncio.py
index 24e33ec9bfa0..5f22ad828e88 100644
--- a/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/tether/transports/grpc_asyncio.py
+++ b/packages/google-cloud-apigee-connect/google/cloud/apigeeconnect_v1/services/tether/transports/grpc_asyncio.py
@@ -171,7 +171,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-apigee-connect/noxfile.py b/packages/google-cloud-apigee-connect/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-apigee-connect/noxfile.py
+++ b/packages/google-cloud-apigee-connect/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-apigee-connect/setup.py b/packages/google-cloud-apigee-connect/setup.py
index 00c4b1777493..42658950f2b2 100644
--- a/packages/google-cloud-apigee-connect/setup.py
+++ b/packages/google-cloud-apigee-connect/setup.py
@@ -46,7 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-apigee-connect"
 
diff --git a/packages/google-cloud-apigee-connect/testing/constraints-3.7.txt b/packages/google-cloud-apigee-connect/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-cloud-apigee-connect/testing/constraints-3.7.txt
+++ b/packages/google-cloud-apigee-connect/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-cloud-apigee-connect/tests/unit/gapic/apigeeconnect_v1/test_connection_service.py b/packages/google-cloud-apigee-connect/tests/unit/gapic/apigeeconnect_v1/test_connection_service.py
index c6df215fef3f..9de23621d03c 100644
--- a/packages/google-cloud-apigee-connect/tests/unit/gapic/apigeeconnect_v1/test_connection_service.py
+++ b/packages/google-cloud-apigee-connect/tests/unit/gapic/apigeeconnect_v1/test_connection_service.py
@@ -1284,12 +1284,7 @@ async def test_list_connections_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_connections
         ] = mock_object
diff --git a/packages/google-cloud-apigee-connect/tests/unit/gapic/apigeeconnect_v1/test_tether.py b/packages/google-cloud-apigee-connect/tests/unit/gapic/apigeeconnect_v1/test_tether.py
index 804e66e6fb66..bb6bb2fcbb19 100644
--- a/packages/google-cloud-apigee-connect/tests/unit/gapic/apigeeconnect_v1/test_tether.py
+++ b/packages/google-cloud-apigee-connect/tests/unit/gapic/apigeeconnect_v1/test_tether.py
@@ -1117,12 +1117,7 @@ async def test_egress_async_use_cached_wrapped_rpc(transport: str = "grpc_asynci
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.egress
         ] = mock_object
diff --git a/packages/google-cloud-apigee-registry/README.rst b/packages/google-cloud-apigee-registry/README.rst
index 2d9406e92ab7..f5c6d19ba966 100644
--- a/packages/google-cloud-apigee-registry/README.rst
+++ b/packages/google-cloud-apigee-registry/README.rst
@@ -15,7 +15,7 @@ Python Client for Apigee Registry API
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-apigee-registry.svg
    :target: https://pypi.org/project/google-cloud-apigee-registry/
 .. _Apigee Registry API: https://cloud.google.com/apigee/docs/api-hub/get-started-registry-api
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/apigeeregistry/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/apigeeregistry/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/apigee/docs/api-hub/get-started-registry-api
 
 Quick Start
diff --git a/packages/google-cloud-apigee-registry/docs/index.rst b/packages/google-cloud-apigee-registry/docs/index.rst
index e5094f218f08..bed6d865c53b 100644
--- a/packages/google-cloud-apigee-registry/docs/index.rst
+++ b/packages/google-cloud-apigee-registry/docs/index.rst
@@ -21,3 +21,8 @@ For a list of all ``google-cloud-apigee-registry`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-apigee-registry/docs/summary_overview.md b/packages/google-cloud-apigee-registry/docs/summary_overview.md
new file mode 100644
index 000000000000..a2b65b7507b8
--- /dev/null
+++ b/packages/google-cloud-apigee-registry/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# Apigee Registry API API
+
+Overview of the APIs available for Apigee Registry API API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+Apigee Registry API API.
+
+[classes](https://cloud.google.com/python/docs/reference/apigeeregistry/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/apigeeregistry/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/apigeeregistry/latest/summary_property.html)
diff --git a/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/provisioning/transports/base.py b/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/provisioning/transports/base.py
index 5d2bbbb3688c..aa1bf2c150c2 100644
--- a/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/provisioning/transports/base.py
+++ b/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/provisioning/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/provisioning/transports/grpc.py b/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/provisioning/transports/grpc.py
index 7f08b7e7599b..9b3bf6846042 100644
--- a/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/provisioning/transports/grpc.py
+++ b/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/provisioning/transports/grpc.py
@@ -127,7 +127,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/provisioning/transports/grpc_asyncio.py b/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/provisioning/transports/grpc_asyncio.py
index 34d1135778f9..da20bf3e2adc 100644
--- a/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/provisioning/transports/grpc_asyncio.py
+++ b/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/provisioning/transports/grpc_asyncio.py
@@ -174,7 +174,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/registry/transports/base.py b/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/registry/transports/base.py
index ea5f2013a6bb..1876bcb9635c 100644
--- a/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/registry/transports/base.py
+++ b/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/registry/transports/base.py
@@ -87,6 +87,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -99,7 +101,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/registry/transports/grpc.py b/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/registry/transports/grpc.py
index dcc42d405cfd..d0f9996c8bb0 100644
--- a/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/registry/transports/grpc.py
+++ b/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/registry/transports/grpc.py
@@ -128,7 +128,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/registry/transports/grpc_asyncio.py b/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/registry/transports/grpc_asyncio.py
index 115d5a62f072..b7d977e2e2f3 100644
--- a/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/registry/transports/grpc_asyncio.py
+++ b/packages/google-cloud-apigee-registry/google/cloud/apigee_registry_v1/services/registry/transports/grpc_asyncio.py
@@ -175,7 +175,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-apigee-registry/noxfile.py b/packages/google-cloud-apigee-registry/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-apigee-registry/noxfile.py
+++ b/packages/google-cloud-apigee-registry/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-apigee-registry/setup.py b/packages/google-cloud-apigee-registry/setup.py
index 41ec841e753d..90b6eb964012 100644
--- a/packages/google-cloud-apigee-registry/setup.py
+++ b/packages/google-cloud-apigee-registry/setup.py
@@ -46,7 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
     "grpc-google-iam-v1 >= 0.12.4, <1.0.0dev",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-apigee-registry"
diff --git a/packages/google-cloud-apigee-registry/testing/constraints-3.7.txt b/packages/google-cloud-apigee-registry/testing/constraints-3.7.txt
index 4cd2782277d4..a81fb6bcd05c 100644
--- a/packages/google-cloud-apigee-registry/testing/constraints-3.7.txt
+++ b/packages/google-cloud-apigee-registry/testing/constraints-3.7.txt
@@ -7,5 +7,5 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
 grpc-google-iam-v1==0.12.4
diff --git a/packages/google-cloud-apigee-registry/tests/unit/gapic/apigee_registry_v1/test_provisioning.py b/packages/google-cloud-apigee-registry/tests/unit/gapic/apigee_registry_v1/test_provisioning.py
index 008f849832f7..d712cbe5b969 100644
--- a/packages/google-cloud-apigee-registry/tests/unit/gapic/apigee_registry_v1/test_provisioning.py
+++ b/packages/google-cloud-apigee-registry/tests/unit/gapic/apigee_registry_v1/test_provisioning.py
@@ -1273,12 +1273,7 @@ async def test_create_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_instance
         ] = mock_object
@@ -1663,12 +1658,7 @@ async def test_delete_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_instance
         ] = mock_object
@@ -2040,12 +2030,7 @@ async def test_get_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_instance
         ] = mock_object
diff --git a/packages/google-cloud-apigee-registry/tests/unit/gapic/apigee_registry_v1/test_registry.py b/packages/google-cloud-apigee-registry/tests/unit/gapic/apigee_registry_v1/test_registry.py
index f8aef2ee7f91..6b5ab2768a92 100644
--- a/packages/google-cloud-apigee-registry/tests/unit/gapic/apigee_registry_v1/test_registry.py
+++ b/packages/google-cloud-apigee-registry/tests/unit/gapic/apigee_registry_v1/test_registry.py
@@ -1235,12 +1235,7 @@ async def test_list_apis_async_use_cached_wrapped_rpc(transport: str = "grpc_asy
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_apis
         ] = mock_object
@@ -1807,12 +1802,7 @@ async def test_get_api_async_use_cached_wrapped_rpc(transport: str = "grpc_async
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_api
         ] = mock_object
@@ -2197,12 +2187,7 @@ async def test_create_api_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_api
         ] = mock_object
@@ -2601,12 +2586,7 @@ async def test_update_api_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_api
         ] = mock_object
@@ -2977,12 +2957,7 @@ async def test_delete_api_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_api
         ] = mock_object
@@ -3351,12 +3326,7 @@ async def test_list_api_versions_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_api_versions
         ] = mock_object
@@ -3938,12 +3908,7 @@ async def test_get_api_version_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_api_version
         ] = mock_object
@@ -4336,12 +4301,7 @@ async def test_create_api_version_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_api_version
         ] = mock_object
@@ -4759,12 +4719,7 @@ async def test_update_api_version_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_api_version
         ] = mock_object
@@ -5160,12 +5115,7 @@ async def test_delete_api_version_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_api_version
         ] = mock_object
@@ -5535,12 +5485,7 @@ async def test_list_api_specs_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_api_specs
         ] = mock_object
@@ -6118,12 +6063,7 @@ async def test_get_api_spec_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_api_spec
         ] = mock_object
@@ -6519,12 +6459,7 @@ async def test_get_api_spec_contents_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_api_spec_contents
         ] = mock_object
@@ -6927,12 +6862,7 @@ async def test_create_api_spec_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_api_spec
         ] = mock_object
@@ -7352,12 +7282,7 @@ async def test_update_api_spec_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_api_spec
         ] = mock_object
@@ -7740,12 +7665,7 @@ async def test_delete_api_spec_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_api_spec
         ] = mock_object
@@ -8139,12 +8059,7 @@ async def test_tag_api_spec_revision_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.tag_api_spec_revision
         ] = mock_object
@@ -8464,12 +8379,7 @@ async def test_list_api_spec_revisions_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_api_spec_revisions
         ] = mock_object
@@ -8992,12 +8902,7 @@ async def test_rollback_api_spec_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.rollback_api_spec
         ] = mock_object
@@ -9339,12 +9244,7 @@ async def test_delete_api_spec_revision_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_api_spec_revision
         ] = mock_object
@@ -9751,12 +9651,7 @@ async def test_list_api_deployments_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_api_deployments
         ] = mock_object
@@ -10365,12 +10260,7 @@ async def test_get_api_deployment_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_api_deployment
         ] = mock_object
@@ -10800,12 +10690,7 @@ async def test_create_api_deployment_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_api_deployment
         ] = mock_object
@@ -11249,12 +11134,7 @@ async def test_update_api_deployment_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_api_deployment
         ] = mock_object
@@ -11661,12 +11541,7 @@ async def test_delete_api_deployment_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_api_deployment
         ] = mock_object
@@ -12071,12 +11946,7 @@ async def test_tag_api_deployment_revision_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.tag_api_deployment_revision
         ] = mock_object
@@ -12396,12 +12266,7 @@ async def test_list_api_deployment_revisions_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_api_deployment_revisions
         ] = mock_object
@@ -12927,12 +12792,7 @@ async def test_rollback_api_deployment_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.rollback_api_deployment
         ] = mock_object
@@ -13274,12 +13134,7 @@ async def test_delete_api_deployment_revision_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_api_deployment_revision
         ] = mock_object
@@ -13674,12 +13529,7 @@ async def test_list_artifacts_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_artifacts
         ] = mock_object
@@ -14245,12 +14095,7 @@ async def test_get_artifact_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_artifact
         ] = mock_object
@@ -14638,12 +14483,7 @@ async def test_get_artifact_contents_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_artifact_contents
         ] = mock_object
@@ -15034,12 +14874,7 @@ async def test_create_artifact_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_artifact
         ] = mock_object
@@ -15441,12 +15276,7 @@ async def test_replace_artifact_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.replace_artifact
         ] = mock_object
@@ -15812,12 +15642,7 @@ async def test_delete_artifact_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_artifact
         ] = mock_object
diff --git a/packages/google-cloud-appengine-admin/README.rst b/packages/google-cloud-appengine-admin/README.rst
index a406f71f3274..acc39a0758ab 100644
--- a/packages/google-cloud-appengine-admin/README.rst
+++ b/packages/google-cloud-appengine-admin/README.rst
@@ -15,7 +15,7 @@ Python Client for App Engine Admin
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-appengine-admin.svg
    :target: https://pypi.org/project/google-cloud-appengine-admin/
 .. _App Engine Admin: https://cloud.google.com/appengine/docs/admin-api/
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/appengine/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/appengine/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/appengine/docs/admin-api/
 
 Quick Start
diff --git a/packages/google-cloud-appengine-admin/docs/index.rst b/packages/google-cloud-appengine-admin/docs/index.rst
index d0276bb53053..56c4e240289b 100644
--- a/packages/google-cloud-appengine-admin/docs/index.rst
+++ b/packages/google-cloud-appengine-admin/docs/index.rst
@@ -21,3 +21,8 @@ For a list of all ``google-cloud-appengine-admin`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-appengine-admin/docs/summary_overview.md b/packages/google-cloud-appengine-admin/docs/summary_overview.md
new file mode 100644
index 000000000000..645d1703c721
--- /dev/null
+++ b/packages/google-cloud-appengine-admin/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# App Engine Admin API
+
+Overview of the APIs available for App Engine Admin API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+App Engine Admin API.
+
+[classes](https://cloud.google.com/python/docs/reference/appengine/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/appengine/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/appengine/latest/summary_property.html)
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/applications/transports/base.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/applications/transports/base.py
index 1150237443ae..28ec1359672e 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/applications/transports/base.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/applications/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/applications/transports/grpc.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/applications/transports/grpc.py
index a975a5081cde..29ab4dafa1ff 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/applications/transports/grpc.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/applications/transports/grpc.py
@@ -123,7 +123,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/applications/transports/grpc_asyncio.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/applications/transports/grpc_asyncio.py
index 7f9b10e5ccaa..ee9ee8141c75 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/applications/transports/grpc_asyncio.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/applications/transports/grpc_asyncio.py
@@ -170,7 +170,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_certificates/transports/base.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_certificates/transports/base.py
index 9b62f64d84dc..7bdc544d48d8 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_certificates/transports/base.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_certificates/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_certificates/transports/grpc.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_certificates/transports/grpc.py
index 001ed2283c68..9ec4a9e494b7 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_certificates/transports/grpc.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_certificates/transports/grpc.py
@@ -124,7 +124,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_certificates/transports/grpc_asyncio.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_certificates/transports/grpc_asyncio.py
index e8572289e61f..17b9265e3c29 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_certificates/transports/grpc_asyncio.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_certificates/transports/grpc_asyncio.py
@@ -171,7 +171,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_domains/transports/base.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_domains/transports/base.py
index fb7ed5bff67e..43dd4ec5942d 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_domains/transports/base.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_domains/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_domains/transports/grpc.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_domains/transports/grpc.py
index 84a357a9a411..8e45f9091018 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_domains/transports/grpc.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_domains/transports/grpc.py
@@ -123,7 +123,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_domains/transports/grpc_asyncio.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_domains/transports/grpc_asyncio.py
index 640af6e63e2f..cf64c506470b 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_domains/transports/grpc_asyncio.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/authorized_domains/transports/grpc_asyncio.py
@@ -170,7 +170,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/domain_mappings/transports/base.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/domain_mappings/transports/base.py
index 34d673060075..064545cc3380 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/domain_mappings/transports/base.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/domain_mappings/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/domain_mappings/transports/grpc.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/domain_mappings/transports/grpc.py
index 8c96918b7fb2..5566ab74c45a 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/domain_mappings/transports/grpc.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/domain_mappings/transports/grpc.py
@@ -123,7 +123,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/domain_mappings/transports/grpc_asyncio.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/domain_mappings/transports/grpc_asyncio.py
index 0873b4bfcbc1..ed8bedb15e7c 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/domain_mappings/transports/grpc_asyncio.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/domain_mappings/transports/grpc_asyncio.py
@@ -170,7 +170,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/firewall/transports/base.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/firewall/transports/base.py
index e8a840317444..6c578b037327 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/firewall/transports/base.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/firewall/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/firewall/transports/grpc.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/firewall/transports/grpc.py
index d506f02d8181..7e4d67f2b742 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/firewall/transports/grpc.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/firewall/transports/grpc.py
@@ -133,7 +133,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/firewall/transports/grpc_asyncio.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/firewall/transports/grpc_asyncio.py
index ef7232044890..d1df08be290b 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/firewall/transports/grpc_asyncio.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/firewall/transports/grpc_asyncio.py
@@ -180,7 +180,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/instances/transports/base.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/instances/transports/base.py
index 0a27f7eae3bd..794d9ff42874 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/instances/transports/base.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/instances/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/instances/transports/grpc.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/instances/transports/grpc.py
index 61af11c8e158..c8cd45be211d 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/instances/transports/grpc.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/instances/transports/grpc.py
@@ -123,7 +123,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/instances/transports/grpc_asyncio.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/instances/transports/grpc_asyncio.py
index 4d6d9c30911b..e33b448f6c6d 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/instances/transports/grpc_asyncio.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/instances/transports/grpc_asyncio.py
@@ -170,7 +170,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/services/transports/base.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/services/transports/base.py
index 8500479d231c..ba3cf8759363 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/services/transports/base.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/services/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/services/transports/grpc.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/services/transports/grpc.py
index aaf5c09bd5f0..02b5eea647ee 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/services/transports/grpc.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/services/transports/grpc.py
@@ -123,7 +123,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/services/transports/grpc_asyncio.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/services/transports/grpc_asyncio.py
index ee761926e72c..a1f8e09f35a3 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/services/transports/grpc_asyncio.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/services/transports/grpc_asyncio.py
@@ -170,7 +170,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/versions/transports/base.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/versions/transports/base.py
index f8a396d85600..dea7dc353f67 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/versions/transports/base.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/versions/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/versions/transports/grpc.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/versions/transports/grpc.py
index c19f29b69ff4..1a49879c12a0 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/versions/transports/grpc.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/versions/transports/grpc.py
@@ -123,7 +123,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/versions/transports/grpc_asyncio.py b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/versions/transports/grpc_asyncio.py
index eb6ea32b312d..364b2314ac37 100644
--- a/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/versions/transports/grpc_asyncio.py
+++ b/packages/google-cloud-appengine-admin/google/cloud/appengine_admin_v1/services/versions/transports/grpc_asyncio.py
@@ -170,7 +170,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-appengine-admin/noxfile.py b/packages/google-cloud-appengine-admin/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-appengine-admin/noxfile.py
+++ b/packages/google-cloud-appengine-admin/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-appengine-admin/setup.py b/packages/google-cloud-appengine-admin/setup.py
index 11874962b603..4839f33e226f 100644
--- a/packages/google-cloud-appengine-admin/setup.py
+++ b/packages/google-cloud-appengine-admin/setup.py
@@ -46,7 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-appengine-admin"
 
diff --git a/packages/google-cloud-appengine-admin/testing/constraints-3.7.txt b/packages/google-cloud-appengine-admin/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-cloud-appengine-admin/testing/constraints-3.7.txt
+++ b/packages/google-cloud-appengine-admin/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_applications.py b/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_applications.py
index 65a24613ccf0..f9c89205652c 100644
--- a/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_applications.py
+++ b/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_applications.py
@@ -1305,12 +1305,7 @@ async def test_get_application_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_application
         ] = mock_object
@@ -1703,12 +1698,7 @@ async def test_create_application_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_application
         ] = mock_object
@@ -1943,12 +1933,7 @@ async def test_update_application_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_application
         ] = mock_object
@@ -2248,12 +2233,7 @@ async def test_repair_application_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.repair_application
         ] = mock_object
diff --git a/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_authorized_certificates.py b/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_authorized_certificates.py
index 43e715b518ee..40c926019eae 100644
--- a/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_authorized_certificates.py
+++ b/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_authorized_certificates.py
@@ -1371,12 +1371,7 @@ async def test_list_authorized_certificates_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_authorized_certificates
         ] = mock_object
@@ -1891,12 +1886,7 @@ async def test_get_authorized_certificate_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_authorized_certificate
         ] = mock_object
@@ -2223,12 +2213,7 @@ async def test_create_authorized_certificate_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_authorized_certificate
         ] = mock_object
@@ -2555,12 +2540,7 @@ async def test_update_authorized_certificate_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_authorized_certificate
         ] = mock_object
@@ -2865,12 +2845,7 @@ async def test_delete_authorized_certificate_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_authorized_certificate
         ] = mock_object
diff --git a/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_authorized_domains.py b/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_authorized_domains.py
index a5b9d49160f2..f6b598fc1695 100644
--- a/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_authorized_domains.py
+++ b/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_authorized_domains.py
@@ -1337,12 +1337,7 @@ async def test_list_authorized_domains_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_authorized_domains
         ] = mock_object
diff --git a/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_domain_mappings.py b/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_domain_mappings.py
index 80b0be445740..14b6e1e82e99 100644
--- a/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_domain_mappings.py
+++ b/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_domain_mappings.py
@@ -1311,12 +1311,7 @@ async def test_list_domain_mappings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_domain_mappings
         ] = mock_object
@@ -1817,12 +1812,7 @@ async def test_get_domain_mapping_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_domain_mapping
         ] = mock_object
@@ -2124,12 +2114,7 @@ async def test_create_domain_mapping_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_domain_mapping
         ] = mock_object
@@ -2430,12 +2415,7 @@ async def test_update_domain_mapping_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_domain_mapping
         ] = mock_object
@@ -2736,12 +2716,7 @@ async def test_delete_domain_mapping_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_domain_mapping
         ] = mock_object
diff --git a/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_firewall.py b/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_firewall.py
index 3f93afd4e539..22f1c1a194b5 100644
--- a/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_firewall.py
+++ b/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_firewall.py
@@ -1245,12 +1245,7 @@ async def test_list_ingress_rules_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_ingress_rules
         ] = mock_object
@@ -1744,12 +1739,7 @@ async def test_batch_update_ingress_rules_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_update_ingress_rules
         ] = mock_object
@@ -2056,12 +2046,7 @@ async def test_create_ingress_rule_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_ingress_rule
         ] = mock_object
@@ -2366,12 +2351,7 @@ async def test_get_ingress_rule_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_ingress_rule
         ] = mock_object
@@ -2680,12 +2660,7 @@ async def test_update_ingress_rule_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_ingress_rule
         ] = mock_object
@@ -2984,12 +2959,7 @@ async def test_delete_ingress_rule_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_ingress_rule
         ] = mock_object
diff --git a/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_instances.py b/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_instances.py
index aec1c8c20e03..6be4982265e4 100644
--- a/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_instances.py
+++ b/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_instances.py
@@ -1254,12 +1254,7 @@ async def test_list_instances_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_instances
         ] = mock_object
@@ -1776,12 +1771,7 @@ async def test_get_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_instance
         ] = mock_object
@@ -2090,12 +2080,7 @@ async def test_delete_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_instance
         ] = mock_object
@@ -2379,12 +2364,7 @@ async def test_debug_instance_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.debug_instance
         ] = mock_object
diff --git a/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_services.py b/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_services.py
index 204652336ccf..06cf69aa830b 100644
--- a/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_services.py
+++ b/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_services.py
@@ -1244,12 +1244,7 @@ async def test_list_services_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_services
         ] = mock_object
@@ -1724,12 +1719,7 @@ async def test_get_service_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_service
         ] = mock_object
@@ -2010,12 +2000,7 @@ async def test_update_service_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_service
         ] = mock_object
@@ -2297,12 +2282,7 @@ async def test_delete_service_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_service
         ] = mock_object
diff --git a/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_versions.py b/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_versions.py
index 5c9ed576ac00..48f1494b2d69 100644
--- a/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_versions.py
+++ b/packages/google-cloud-appengine-admin/tests/unit/gapic/appengine_admin_v1/test_versions.py
@@ -1246,12 +1246,7 @@ async def test_list_versions_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_versions
         ] = mock_object
@@ -1779,12 +1774,7 @@ async def test_get_version_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_version
         ] = mock_object
@@ -2101,12 +2091,7 @@ async def test_create_version_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_version
         ] = mock_object
@@ -2388,12 +2373,7 @@ async def test_update_version_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_version
         ] = mock_object
@@ -2675,12 +2655,7 @@ async def test_delete_version_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_version
         ] = mock_object
diff --git a/packages/google-cloud-apphub/README.rst b/packages/google-cloud-apphub/README.rst
index afe5c072a258..b9be0e332436 100644
--- a/packages/google-cloud-apphub/README.rst
+++ b/packages/google-cloud-apphub/README.rst
@@ -15,7 +15,7 @@ Python Client for App Hub API
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-apphub.svg
    :target: https://pypi.org/project/google-cloud-apphub/
 .. _App Hub API: https://cloud.google.com/app-hub/docs/overview
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/google-cloud-apphub/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/google-cloud-apphub/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/app-hub/docs/overview
 
 Quick Start
diff --git a/packages/google-cloud-apphub/docs/index.rst b/packages/google-cloud-apphub/docs/index.rst
index fbfd1779f0e4..5cb6234aa5f6 100644
--- a/packages/google-cloud-apphub/docs/index.rst
+++ b/packages/google-cloud-apphub/docs/index.rst
@@ -21,3 +21,8 @@ For a list of all ``google-cloud-apphub`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-apphub/docs/summary_overview.md b/packages/google-cloud-apphub/docs/summary_overview.md
new file mode 100644
index 000000000000..2f151baa3f66
--- /dev/null
+++ b/packages/google-cloud-apphub/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# App Hub API API
+
+Overview of the APIs available for App Hub API API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+App Hub API API.
+
+[classes](https://cloud.google.com/python/docs/reference/google-cloud-apphub/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/google-cloud-apphub/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/google-cloud-apphub/latest/summary_property.html)
diff --git a/packages/google-cloud-apphub/google/cloud/apphub_v1/services/app_hub/transports/base.py b/packages/google-cloud-apphub/google/cloud/apphub_v1/services/app_hub/transports/base.py
index 383976a78e67..adbc461e751f 100644
--- a/packages/google-cloud-apphub/google/cloud/apphub_v1/services/app_hub/transports/base.py
+++ b/packages/google-cloud-apphub/google/cloud/apphub_v1/services/app_hub/transports/base.py
@@ -91,6 +91,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -103,7 +105,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-apphub/google/cloud/apphub_v1/services/app_hub/transports/grpc.py b/packages/google-cloud-apphub/google/cloud/apphub_v1/services/app_hub/transports/grpc.py
index 900ed4845702..afaff2d67194 100644
--- a/packages/google-cloud-apphub/google/cloud/apphub_v1/services/app_hub/transports/grpc.py
+++ b/packages/google-cloud-apphub/google/cloud/apphub_v1/services/app_hub/transports/grpc.py
@@ -132,7 +132,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-apphub/google/cloud/apphub_v1/services/app_hub/transports/grpc_asyncio.py b/packages/google-cloud-apphub/google/cloud/apphub_v1/services/app_hub/transports/grpc_asyncio.py
index f873831d824a..935576f4a252 100644
--- a/packages/google-cloud-apphub/google/cloud/apphub_v1/services/app_hub/transports/grpc_asyncio.py
+++ b/packages/google-cloud-apphub/google/cloud/apphub_v1/services/app_hub/transports/grpc_asyncio.py
@@ -179,7 +179,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-apphub/noxfile.py b/packages/google-cloud-apphub/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-apphub/noxfile.py
+++ b/packages/google-cloud-apphub/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-apphub/setup.py b/packages/google-cloud-apphub/setup.py
index 4231ee3fcbf0..35838fb41354 100644
--- a/packages/google-cloud-apphub/setup.py
+++ b/packages/google-cloud-apphub/setup.py
@@ -44,7 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
     "grpc-google-iam-v1 >= 0.12.4, <1.0.0dev",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-apphub"
diff --git a/packages/google-cloud-apphub/testing/constraints-3.7.txt b/packages/google-cloud-apphub/testing/constraints-3.7.txt
index 4cd2782277d4..a81fb6bcd05c 100644
--- a/packages/google-cloud-apphub/testing/constraints-3.7.txt
+++ b/packages/google-cloud-apphub/testing/constraints-3.7.txt
@@ -7,5 +7,5 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
 grpc-google-iam-v1==0.12.4
diff --git a/packages/google-cloud-apphub/tests/unit/gapic/apphub_v1/test_app_hub.py b/packages/google-cloud-apphub/tests/unit/gapic/apphub_v1/test_app_hub.py
index 566e0fc90f1c..8355ae2a6512 100644
--- a/packages/google-cloud-apphub/tests/unit/gapic/apphub_v1/test_app_hub.py
+++ b/packages/google-cloud-apphub/tests/unit/gapic/apphub_v1/test_app_hub.py
@@ -1248,12 +1248,7 @@ async def test_lookup_service_project_attachment_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.lookup_service_project_attachment
         ] = mock_object
@@ -1647,12 +1642,7 @@ async def test_list_service_project_attachments_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_service_project_attachments
         ] = mock_object
@@ -2249,12 +2239,7 @@ async def test_create_service_project_attachment_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_service_project_attachment
         ] = mock_object
@@ -2687,12 +2672,7 @@ async def test_get_service_project_attachment_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_service_project_attachment
         ] = mock_object
@@ -3090,12 +3070,7 @@ async def test_delete_service_project_attachment_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_service_project_attachment
         ] = mock_object
@@ -3479,12 +3454,7 @@ async def test_detach_service_project_attachment_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.detach_service_project_attachment
         ] = mock_object
@@ -3878,12 +3848,7 @@ async def test_list_discovered_services_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_discovered_services
         ] = mock_object
@@ -4471,12 +4436,7 @@ async def test_get_discovered_service_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_discovered_service
         ] = mock_object
@@ -4861,12 +4821,7 @@ async def test_lookup_discovered_service_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.lookup_discovered_service
         ] = mock_object
@@ -5257,12 +5212,7 @@ async def test_list_services_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_services
         ] = mock_object
@@ -5821,12 +5771,7 @@ async def test_create_service_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_service
         ] = mock_object
@@ -6226,12 +6171,7 @@ async def test_get_service_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_service
         ] = mock_object
@@ -6600,12 +6540,7 @@ async def test_update_service_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_service
         ] = mock_object
@@ -6981,12 +6916,7 @@ async def test_delete_service_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_service
         ] = mock_object
@@ -7373,12 +7303,7 @@ async def test_list_discovered_workloads_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_discovered_workloads
         ] = mock_object
@@ -7966,12 +7891,7 @@ async def test_get_discovered_workload_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_discovered_workload
         ] = mock_object
@@ -8356,12 +8276,7 @@ async def test_lookup_discovered_workload_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.lookup_discovered_workload
         ] = mock_object
@@ -8752,12 +8667,7 @@ async def test_list_workloads_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_workloads
         ] = mock_object
@@ -9316,12 +9226,7 @@ async def test_create_workload_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_workload
         ] = mock_object
@@ -9721,12 +9626,7 @@ async def test_get_workload_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_workload
         ] = mock_object
@@ -10095,12 +9995,7 @@ async def test_update_workload_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_workload
         ] = mock_object
@@ -10476,12 +10371,7 @@ async def test_delete_workload_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_workload
         ] = mock_object
@@ -10865,12 +10755,7 @@ async def test_list_applications_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_applications
         ] = mock_object
@@ -11459,12 +11344,7 @@ async def test_create_application_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_application
         ] = mock_object
@@ -11872,12 +11752,7 @@ async def test_get_application_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_application
         ] = mock_object
@@ -12260,12 +12135,7 @@ async def test_update_application_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_application
         ] = mock_object
@@ -12664,12 +12534,7 @@ async def test_delete_application_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_application
         ] = mock_object
diff --git a/packages/google-cloud-artifact-registry/README.rst b/packages/google-cloud-artifact-registry/README.rst
index 3b0fdfb64898..b2513a0873a4 100644
--- a/packages/google-cloud-artifact-registry/README.rst
+++ b/packages/google-cloud-artifact-registry/README.rst
@@ -15,7 +15,7 @@ Python Client for Artifact Registry
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-artifact-registry.svg
    :target: https://pypi.org/project/google-cloud-artifact-registry/
 .. _Artifact Registry: https://cloud.google.com/artifact-registry
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/artifactregistry/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/artifactregistry/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/artifact-registry
 
 Quick Start
diff --git a/packages/google-cloud-artifact-registry/docs/index.rst b/packages/google-cloud-artifact-registry/docs/index.rst
index 1297982b54a1..0a9919d64d0b 100644
--- a/packages/google-cloud-artifact-registry/docs/index.rst
+++ b/packages/google-cloud-artifact-registry/docs/index.rst
@@ -32,3 +32,8 @@ For a list of all ``google-cloud-artifact-registry`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-artifact-registry/docs/summary_overview.md b/packages/google-cloud-artifact-registry/docs/summary_overview.md
new file mode 100644
index 000000000000..9591f2a5270c
--- /dev/null
+++ b/packages/google-cloud-artifact-registry/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# Artifact Registry API
+
+Overview of the APIs available for Artifact Registry API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+Artifact Registry API.
+
+[classes](https://cloud.google.com/python/docs/reference/artifactregistry/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/artifactregistry/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/artifactregistry/latest/summary_property.html)
diff --git a/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1/services/artifact_registry/transports/base.py b/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1/services/artifact_registry/transports/base.py
index 8a2c3d30f5e1..b7fb1864aab0 100644
--- a/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1/services/artifact_registry/transports/base.py
+++ b/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1/services/artifact_registry/transports/base.py
@@ -98,6 +98,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -110,7 +112,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1/services/artifact_registry/transports/grpc.py b/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1/services/artifact_registry/transports/grpc.py
index c48b7c736cfb..a7029edd8511 100644
--- a/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1/services/artifact_registry/transports/grpc.py
+++ b/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1/services/artifact_registry/transports/grpc.py
@@ -148,7 +148,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1/services/artifact_registry/transports/grpc_asyncio.py b/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1/services/artifact_registry/transports/grpc_asyncio.py
index ccfff23f95e1..bd1ad0969c5a 100644
--- a/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1/services/artifact_registry/transports/grpc_asyncio.py
+++ b/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1/services/artifact_registry/transports/grpc_asyncio.py
@@ -195,7 +195,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1beta2/services/artifact_registry/transports/base.py b/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1beta2/services/artifact_registry/transports/base.py
index 0d0c00679a7f..ba158b1218f7 100644
--- a/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1beta2/services/artifact_registry/transports/base.py
+++ b/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1beta2/services/artifact_registry/transports/base.py
@@ -95,6 +95,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -107,7 +109,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1beta2/services/artifact_registry/transports/grpc.py b/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1beta2/services/artifact_registry/transports/grpc.py
index c5ad80ffd537..1084ec6ab5ac 100644
--- a/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1beta2/services/artifact_registry/transports/grpc.py
+++ b/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1beta2/services/artifact_registry/transports/grpc.py
@@ -145,7 +145,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1beta2/services/artifact_registry/transports/grpc_asyncio.py b/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1beta2/services/artifact_registry/transports/grpc_asyncio.py
index 913394bc764f..646bb4a44482 100644
--- a/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1beta2/services/artifact_registry/transports/grpc_asyncio.py
+++ b/packages/google-cloud-artifact-registry/google/cloud/artifactregistry_v1beta2/services/artifact_registry/transports/grpc_asyncio.py
@@ -192,7 +192,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-artifact-registry/noxfile.py b/packages/google-cloud-artifact-registry/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-artifact-registry/noxfile.py
+++ b/packages/google-cloud-artifact-registry/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-artifact-registry/setup.py b/packages/google-cloud-artifact-registry/setup.py
index b4acf7dc8e57..2667b7cd66b0 100644
--- a/packages/google-cloud-artifact-registry/setup.py
+++ b/packages/google-cloud-artifact-registry/setup.py
@@ -46,7 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
     "grpc-google-iam-v1 >= 0.12.4, <1.0.0dev",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-artifact-registry"
diff --git a/packages/google-cloud-artifact-registry/testing/constraints-3.7.txt b/packages/google-cloud-artifact-registry/testing/constraints-3.7.txt
index 4cd2782277d4..a81fb6bcd05c 100644
--- a/packages/google-cloud-artifact-registry/testing/constraints-3.7.txt
+++ b/packages/google-cloud-artifact-registry/testing/constraints-3.7.txt
@@ -7,5 +7,5 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
 grpc-google-iam-v1==0.12.4
diff --git a/packages/google-cloud-artifact-registry/tests/unit/gapic/artifactregistry_v1/test_artifact_registry.py b/packages/google-cloud-artifact-registry/tests/unit/gapic/artifactregistry_v1/test_artifact_registry.py
index a2c672d5e00c..f9af2376452f 100644
--- a/packages/google-cloud-artifact-registry/tests/unit/gapic/artifactregistry_v1/test_artifact_registry.py
+++ b/packages/google-cloud-artifact-registry/tests/unit/gapic/artifactregistry_v1/test_artifact_registry.py
@@ -1358,12 +1358,7 @@ async def test_list_docker_images_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_docker_images
         ] = mock_object
@@ -1949,12 +1944,7 @@ async def test_get_docker_image_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_docker_image
         ] = mock_object
@@ -2340,12 +2330,7 @@ async def test_list_maven_artifacts_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_maven_artifacts
         ] = mock_object
@@ -2941,12 +2926,7 @@ async def test_get_maven_artifact_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_maven_artifact
         ] = mock_object
@@ -3340,12 +3320,7 @@ async def test_list_npm_packages_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_npm_packages
         ] = mock_object
@@ -3926,12 +3901,7 @@ async def test_get_npm_package_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_npm_package
         ] = mock_object
@@ -4311,12 +4281,7 @@ async def test_list_python_packages_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_python_packages
         ] = mock_object
@@ -4909,12 +4874,7 @@ async def test_get_python_package_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_python_package
         ] = mock_object
@@ -5305,12 +5265,7 @@ async def test_import_apt_artifacts_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.import_apt_artifacts
         ] = mock_object
@@ -5610,12 +5565,7 @@ async def test_import_yum_artifacts_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.import_yum_artifacts
         ] = mock_object
@@ -5916,12 +5866,7 @@ async def test_list_repositories_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_repositories
         ] = mock_object
@@ -6514,12 +6459,7 @@ async def test_get_repository_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_repository
         ] = mock_object
@@ -6908,12 +6848,7 @@ async def test_create_repository_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_repository
         ] = mock_object
@@ -7359,12 +7294,7 @@ async def test_update_repository_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_repository
         ] = mock_object
@@ -7795,12 +7725,7 @@ async def test_delete_repository_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_repository
         ] = mock_object
@@ -8177,12 +8102,7 @@ async def test_list_packages_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_packages
         ] = mock_object
@@ -8739,12 +8659,7 @@ async def test_get_package_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_package
         ] = mock_object
@@ -9105,12 +9020,7 @@ async def test_delete_package_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_package
         ] = mock_object
@@ -9479,12 +9389,7 @@ async def test_list_versions_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_versions
         ] = mock_object
@@ -10041,12 +9946,7 @@ async def test_get_version_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_version
         ] = mock_object
@@ -10407,12 +10307,7 @@ async def test_delete_version_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_version
         ] = mock_object
@@ -10789,12 +10684,7 @@ async def test_batch_delete_versions_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_delete_versions
         ] = mock_object
@@ -11183,12 +11073,7 @@ async def test_list_files_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_files
         ] = mock_object
@@ -11746,12 +11631,7 @@ async def test_get_file_async_use_cached_wrapped_rpc(transport: str = "grpc_asyn
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_file
         ] = mock_object
@@ -12117,12 +11997,7 @@ async def test_list_tags_async_use_cached_wrapped_rpc(transport: str = "grpc_asy
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_tags
         ] = mock_object
@@ -12677,12 +12552,7 @@ async def test_get_tag_async_use_cached_wrapped_rpc(transport: str = "grpc_async
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_tag
         ] = mock_object
@@ -13047,12 +12917,7 @@ async def test_create_tag_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_tag
         ] = mock_object
@@ -13431,12 +13296,7 @@ async def test_update_tag_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_tag
         ] = mock_object
@@ -13799,12 +13659,7 @@ async def test_delete_tag_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_tag
         ] = mock_object
@@ -14162,12 +14017,7 @@ async def test_set_iam_policy_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.set_iam_policy
         ] = mock_object
@@ -14470,12 +14320,7 @@ async def test_get_iam_policy_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_iam_policy
         ] = mock_object
@@ -14786,12 +14631,7 @@ async def test_test_iam_permissions_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.test_iam_permissions
         ] = mock_object
@@ -15117,12 +14957,7 @@ async def test_get_project_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_project_settings
         ] = mock_object
@@ -15516,12 +15351,7 @@ async def test_update_project_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_project_settings
         ] = mock_object
@@ -15915,12 +15745,7 @@ async def test_get_vpcsc_config_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_vpcsc_config
         ] = mock_object
@@ -16297,12 +16122,7 @@ async def test_update_vpcsc_config_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_vpcsc_config
         ] = mock_object
diff --git a/packages/google-cloud-artifact-registry/tests/unit/gapic/artifactregistry_v1beta2/test_artifact_registry.py b/packages/google-cloud-artifact-registry/tests/unit/gapic/artifactregistry_v1beta2/test_artifact_registry.py
index 707d07f60eb7..5ca6ce80bf2d 100644
--- a/packages/google-cloud-artifact-registry/tests/unit/gapic/artifactregistry_v1beta2/test_artifact_registry.py
+++ b/packages/google-cloud-artifact-registry/tests/unit/gapic/artifactregistry_v1beta2/test_artifact_registry.py
@@ -1349,12 +1349,7 @@ async def test_import_apt_artifacts_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.import_apt_artifacts
         ] = mock_object
@@ -1654,12 +1649,7 @@ async def test_import_yum_artifacts_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.import_yum_artifacts
         ] = mock_object
@@ -1960,12 +1950,7 @@ async def test_list_repositories_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_repositories
         ] = mock_object
@@ -2546,12 +2531,7 @@ async def test_get_repository_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_repository
         ] = mock_object
@@ -2932,12 +2912,7 @@ async def test_create_repository_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_repository
         ] = mock_object
@@ -3371,12 +3346,7 @@ async def test_update_repository_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_repository
         ] = mock_object
@@ -3799,12 +3769,7 @@ async def test_delete_repository_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_repository
         ] = mock_object
@@ -4181,12 +4146,7 @@ async def test_list_packages_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_packages
         ] = mock_object
@@ -4743,12 +4703,7 @@ async def test_get_package_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_package
         ] = mock_object
@@ -5109,12 +5064,7 @@ async def test_delete_package_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_package
         ] = mock_object
@@ -5483,12 +5433,7 @@ async def test_list_versions_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_versions
         ] = mock_object
@@ -6045,12 +5990,7 @@ async def test_get_version_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_version
         ] = mock_object
@@ -6411,12 +6351,7 @@ async def test_delete_version_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_version
         ] = mock_object
@@ -6783,12 +6718,7 @@ async def test_list_files_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_files
         ] = mock_object
@@ -7346,12 +7276,7 @@ async def test_get_file_async_use_cached_wrapped_rpc(transport: str = "grpc_asyn
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_file
         ] = mock_object
@@ -7717,12 +7642,7 @@ async def test_list_tags_async_use_cached_wrapped_rpc(transport: str = "grpc_asy
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_tags
         ] = mock_object
@@ -8277,12 +8197,7 @@ async def test_get_tag_async_use_cached_wrapped_rpc(transport: str = "grpc_async
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_tag
         ] = mock_object
@@ -8647,12 +8562,7 @@ async def test_create_tag_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_tag
         ] = mock_object
@@ -9031,12 +8941,7 @@ async def test_update_tag_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_tag
         ] = mock_object
@@ -9399,12 +9304,7 @@ async def test_delete_tag_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_tag
         ] = mock_object
@@ -9762,12 +9662,7 @@ async def test_set_iam_policy_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.set_iam_policy
         ] = mock_object
@@ -10070,12 +9965,7 @@ async def test_get_iam_policy_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_iam_policy
         ] = mock_object
@@ -10386,12 +10276,7 @@ async def test_test_iam_permissions_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.test_iam_permissions
         ] = mock_object
@@ -10717,12 +10602,7 @@ async def test_get_project_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_project_settings
         ] = mock_object
@@ -11116,12 +10996,7 @@ async def test_update_project_settings_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_project_settings
         ] = mock_object
diff --git a/packages/google-cloud-asset/README.rst b/packages/google-cloud-asset/README.rst
index 9a14a01029bd..a9eb11117e78 100644
--- a/packages/google-cloud-asset/README.rst
+++ b/packages/google-cloud-asset/README.rst
@@ -15,7 +15,7 @@ Python Client for Cloud Asset Inventory
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-asset.svg
    :target: https://pypi.org/project/google-cloud-asset/
 .. _Cloud Asset Inventory: https://cloud.google.com/resource-manager/docs/cloud-asset-inventory/overview
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/cloudasset/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/cloudasset/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/resource-manager/docs/cloud-asset-inventory/overview
 
 Quick Start
diff --git a/packages/google-cloud-asset/docs/index.rst b/packages/google-cloud-asset/docs/index.rst
index 861fdd22dd34..b306bcf1baa5 100644
--- a/packages/google-cloud-asset/docs/index.rst
+++ b/packages/google-cloud-asset/docs/index.rst
@@ -56,3 +56,8 @@ For a list of all ``google-cloud-asset`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-asset/docs/summary_overview.md b/packages/google-cloud-asset/docs/summary_overview.md
new file mode 100644
index 000000000000..f49ebbcd7555
--- /dev/null
+++ b/packages/google-cloud-asset/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# Cloud Asset Inventory API
+
+Overview of the APIs available for Cloud Asset Inventory API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+Cloud Asset Inventory API.
+
+[classes](https://cloud.google.com/python/docs/reference/cloudasset/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/cloudasset/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/cloudasset/latest/summary_property.html)
diff --git a/packages/google-cloud-asset/google/cloud/asset_v1/services/asset_service/transports/base.py b/packages/google-cloud-asset/google/cloud/asset_v1/services/asset_service/transports/base.py
index 40e921f0c587..d7087b5a9dc1 100644
--- a/packages/google-cloud-asset/google/cloud/asset_v1/services/asset_service/transports/base.py
+++ b/packages/google-cloud-asset/google/cloud/asset_v1/services/asset_service/transports/base.py
@@ -83,6 +83,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -95,7 +97,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-asset/google/cloud/asset_v1/services/asset_service/transports/grpc.py b/packages/google-cloud-asset/google/cloud/asset_v1/services/asset_service/transports/grpc.py
index 56c2bc60822e..faa124f3ca16 100644
--- a/packages/google-cloud-asset/google/cloud/asset_v1/services/asset_service/transports/grpc.py
+++ b/packages/google-cloud-asset/google/cloud/asset_v1/services/asset_service/transports/grpc.py
@@ -124,7 +124,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-asset/google/cloud/asset_v1/services/asset_service/transports/grpc_asyncio.py b/packages/google-cloud-asset/google/cloud/asset_v1/services/asset_service/transports/grpc_asyncio.py
index 67b8710f0cdc..3c4dc7278042 100644
--- a/packages/google-cloud-asset/google/cloud/asset_v1/services/asset_service/transports/grpc_asyncio.py
+++ b/packages/google-cloud-asset/google/cloud/asset_v1/services/asset_service/transports/grpc_asyncio.py
@@ -171,7 +171,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-asset/google/cloud/asset_v1p1beta1/services/asset_service/transports/base.py b/packages/google-cloud-asset/google/cloud/asset_v1p1beta1/services/asset_service/transports/base.py
index e35c524ad915..c0300f9b7872 100644
--- a/packages/google-cloud-asset/google/cloud/asset_v1p1beta1/services/asset_service/transports/base.py
+++ b/packages/google-cloud-asset/google/cloud/asset_v1p1beta1/services/asset_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-asset/google/cloud/asset_v1p1beta1/services/asset_service/transports/grpc.py b/packages/google-cloud-asset/google/cloud/asset_v1p1beta1/services/asset_service/transports/grpc.py
index dd361d605631..f09ed8840e9b 100644
--- a/packages/google-cloud-asset/google/cloud/asset_v1p1beta1/services/asset_service/transports/grpc.py
+++ b/packages/google-cloud-asset/google/cloud/asset_v1p1beta1/services/asset_service/transports/grpc.py
@@ -122,7 +122,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-asset/google/cloud/asset_v1p1beta1/services/asset_service/transports/grpc_asyncio.py b/packages/google-cloud-asset/google/cloud/asset_v1p1beta1/services/asset_service/transports/grpc_asyncio.py
index 66685bd296b4..3b453929a36a 100644
--- a/packages/google-cloud-asset/google/cloud/asset_v1p1beta1/services/asset_service/transports/grpc_asyncio.py
+++ b/packages/google-cloud-asset/google/cloud/asset_v1p1beta1/services/asset_service/transports/grpc_asyncio.py
@@ -169,7 +169,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-asset/google/cloud/asset_v1p2beta1/services/asset_service/transports/base.py b/packages/google-cloud-asset/google/cloud/asset_v1p2beta1/services/asset_service/transports/base.py
index 3778ee1a1a49..4364e60548e8 100644
--- a/packages/google-cloud-asset/google/cloud/asset_v1p2beta1/services/asset_service/transports/base.py
+++ b/packages/google-cloud-asset/google/cloud/asset_v1p2beta1/services/asset_service/transports/base.py
@@ -83,6 +83,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -95,7 +97,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-asset/google/cloud/asset_v1p2beta1/services/asset_service/transports/grpc.py b/packages/google-cloud-asset/google/cloud/asset_v1p2beta1/services/asset_service/transports/grpc.py
index a179cdf56e1a..4366e0f9f31d 100644
--- a/packages/google-cloud-asset/google/cloud/asset_v1p2beta1/services/asset_service/transports/grpc.py
+++ b/packages/google-cloud-asset/google/cloud/asset_v1p2beta1/services/asset_service/transports/grpc.py
@@ -123,7 +123,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-asset/google/cloud/asset_v1p2beta1/services/asset_service/transports/grpc_asyncio.py b/packages/google-cloud-asset/google/cloud/asset_v1p2beta1/services/asset_service/transports/grpc_asyncio.py
index 6bbd0634c5fb..8667fa3aa876 100644
--- a/packages/google-cloud-asset/google/cloud/asset_v1p2beta1/services/asset_service/transports/grpc_asyncio.py
+++ b/packages/google-cloud-asset/google/cloud/asset_v1p2beta1/services/asset_service/transports/grpc_asyncio.py
@@ -170,7 +170,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-asset/google/cloud/asset_v1p5beta1/services/asset_service/transports/base.py b/packages/google-cloud-asset/google/cloud/asset_v1p5beta1/services/asset_service/transports/base.py
index a35a7a4872c0..6d457a677a2e 100644
--- a/packages/google-cloud-asset/google/cloud/asset_v1p5beta1/services/asset_service/transports/base.py
+++ b/packages/google-cloud-asset/google/cloud/asset_v1p5beta1/services/asset_service/transports/base.py
@@ -82,6 +82,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -94,7 +96,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-asset/google/cloud/asset_v1p5beta1/services/asset_service/transports/grpc.py b/packages/google-cloud-asset/google/cloud/asset_v1p5beta1/services/asset_service/transports/grpc.py
index 531d065055d2..c8600596328d 100644
--- a/packages/google-cloud-asset/google/cloud/asset_v1p5beta1/services/asset_service/transports/grpc.py
+++ b/packages/google-cloud-asset/google/cloud/asset_v1p5beta1/services/asset_service/transports/grpc.py
@@ -122,7 +122,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-asset/google/cloud/asset_v1p5beta1/services/asset_service/transports/grpc_asyncio.py b/packages/google-cloud-asset/google/cloud/asset_v1p5beta1/services/asset_service/transports/grpc_asyncio.py
index a1b8c2885e50..4e055c56bb80 100644
--- a/packages/google-cloud-asset/google/cloud/asset_v1p5beta1/services/asset_service/transports/grpc_asyncio.py
+++ b/packages/google-cloud-asset/google/cloud/asset_v1p5beta1/services/asset_service/transports/grpc_asyncio.py
@@ -169,7 +169,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-asset/noxfile.py b/packages/google-cloud-asset/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-asset/noxfile.py
+++ b/packages/google-cloud-asset/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-asset/setup.py b/packages/google-cloud-asset/setup.py
index b9152c8ea0f3..4d4f77f94187 100644
--- a/packages/google-cloud-asset/setup.py
+++ b/packages/google-cloud-asset/setup.py
@@ -45,7 +45,7 @@
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "google-cloud-org-policy >= 0.1.2, <2.0.0dev",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
     "google-cloud-access-context-manager >= 0.1.2, <1.0.0dev",
     "google-cloud-os-config >= 1.0.0, <2.0.0dev",
     "grpc-google-iam-v1 >= 0.12.4, <1.0.0dev",
diff --git a/packages/google-cloud-asset/testing/constraints-3.7.txt b/packages/google-cloud-asset/testing/constraints-3.7.txt
index 84e134ffb364..bc8e34f1f281 100644
--- a/packages/google-cloud-asset/testing/constraints-3.7.txt
+++ b/packages/google-cloud-asset/testing/constraints-3.7.txt
@@ -8,7 +8,7 @@ google-api-core==1.34.1
 google-auth==2.14.1
 google-cloud-org-policy==0.1.2
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
 google-cloud-access-context-manager==0.1.2
 google-cloud-os-config==1.0.0
 grpc-google-iam-v1==0.12.4
diff --git a/packages/google-cloud-asset/tests/unit/gapic/asset_v1/test_asset_service.py b/packages/google-cloud-asset/tests/unit/gapic/asset_v1/test_asset_service.py
index d7e30e55ddfe..c3cfae936fa0 100644
--- a/packages/google-cloud-asset/tests/unit/gapic/asset_v1/test_asset_service.py
+++ b/packages/google-cloud-asset/tests/unit/gapic/asset_v1/test_asset_service.py
@@ -1271,12 +1271,7 @@ async def test_export_assets_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.export_assets
         ] = mock_object
@@ -1561,12 +1556,7 @@ async def test_list_assets_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_assets
         ] = mock_object
@@ -2128,12 +2118,7 @@ async def test_batch_get_assets_history_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_get_assets_history
         ] = mock_object
@@ -2433,12 +2418,7 @@ async def test_create_feed_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_feed
         ] = mock_object
@@ -2816,12 +2796,7 @@ async def test_get_feed_async_use_cached_wrapped_rpc(transport: str = "grpc_asyn
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_feed
         ] = mock_object
@@ -3182,12 +3157,7 @@ async def test_list_feeds_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_feeds
         ] = mock_object
@@ -3556,12 +3526,7 @@ async def test_update_feed_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_feed
         ] = mock_object
@@ -3922,12 +3887,7 @@ async def test_delete_feed_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_feed
         ] = mock_object
@@ -4300,12 +4260,7 @@ async def test_search_all_resources_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.search_all_resources
         ] = mock_object
@@ -4917,12 +4872,7 @@ async def test_search_all_iam_policies_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.search_all_iam_policies
         ] = mock_object
@@ -5517,12 +5467,7 @@ async def test_analyze_iam_policy_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.analyze_iam_policy
         ] = mock_object
@@ -5822,12 +5767,7 @@ async def test_analyze_iam_policy_longrunning_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.analyze_iam_policy_longrunning
         ] = mock_object
@@ -6114,12 +6054,7 @@ async def test_analyze_move_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.analyze_move
         ] = mock_object
@@ -6407,12 +6342,7 @@ async def test_query_assets_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.query_assets
         ] = mock_object
@@ -6719,12 +6649,7 @@ async def test_create_saved_query_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_saved_query
         ] = mock_object
@@ -7133,12 +7058,7 @@ async def test_get_saved_query_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_saved_query
         ] = mock_object
@@ -7524,12 +7444,7 @@ async def test_list_saved_queries_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_saved_queries
         ] = mock_object
@@ -8118,12 +8033,7 @@ async def test_update_saved_query_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_saved_query
         ] = mock_object
@@ -8518,12 +8428,7 @@ async def test_delete_saved_query_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_saved_query
         ] = mock_object
@@ -8896,12 +8801,7 @@ async def test_batch_get_effective_iam_policies_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.batch_get_effective_iam_policies
         ] = mock_object
@@ -9205,12 +9105,7 @@ async def test_analyze_org_policies_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.analyze_org_policies
         ] = mock_object
@@ -9828,12 +9723,7 @@ async def test_analyze_org_policy_governed_containers_async_use_cached_wrapped_r
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.analyze_org_policy_governed_containers
         ] = mock_object
@@ -10457,12 +10347,7 @@ async def test_analyze_org_policy_governed_assets_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.analyze_org_policy_governed_assets
         ] = mock_object
diff --git a/packages/google-cloud-asset/tests/unit/gapic/asset_v1p1beta1/test_asset_service.py b/packages/google-cloud-asset/tests/unit/gapic/asset_v1p1beta1/test_asset_service.py
index d421305e1342..0a6024a4cfe9 100644
--- a/packages/google-cloud-asset/tests/unit/gapic/asset_v1p1beta1/test_asset_service.py
+++ b/packages/google-cloud-asset/tests/unit/gapic/asset_v1p1beta1/test_asset_service.py
@@ -1276,12 +1276,7 @@ async def test_search_all_resources_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.search_all_resources
         ] = mock_object
@@ -1891,12 +1886,7 @@ async def test_search_all_iam_policies_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.search_all_iam_policies
         ] = mock_object
diff --git a/packages/google-cloud-asset/tests/unit/gapic/asset_v1p2beta1/test_asset_service.py b/packages/google-cloud-asset/tests/unit/gapic/asset_v1p2beta1/test_asset_service.py
index aab8d8717bee..b15d99a86375 100644
--- a/packages/google-cloud-asset/tests/unit/gapic/asset_v1p2beta1/test_asset_service.py
+++ b/packages/google-cloud-asset/tests/unit/gapic/asset_v1p2beta1/test_asset_service.py
@@ -1269,12 +1269,7 @@ async def test_create_feed_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_feed
         ] = mock_object
@@ -1647,12 +1642,7 @@ async def test_get_feed_async_use_cached_wrapped_rpc(transport: str = "grpc_asyn
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_feed
         ] = mock_object
@@ -2011,12 +2001,7 @@ async def test_list_feeds_async_use_cached_wrapped_rpc(transport: str = "grpc_as
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_feeds
         ] = mock_object
@@ -2382,12 +2367,7 @@ async def test_update_feed_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_feed
         ] = mock_object
@@ -2746,12 +2726,7 @@ async def test_delete_feed_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_feed
         ] = mock_object
diff --git a/packages/google-cloud-asset/tests/unit/gapic/asset_v1p5beta1/test_asset_service.py b/packages/google-cloud-asset/tests/unit/gapic/asset_v1p5beta1/test_asset_service.py
index a093eb7f1bb1..e193a60098b8 100644
--- a/packages/google-cloud-asset/tests/unit/gapic/asset_v1p5beta1/test_asset_service.py
+++ b/packages/google-cloud-asset/tests/unit/gapic/asset_v1p5beta1/test_asset_service.py
@@ -1261,12 +1261,7 @@ async def test_list_assets_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_assets
         ] = mock_object
diff --git a/packages/google-cloud-assured-workloads/README.rst b/packages/google-cloud-assured-workloads/README.rst
index 59665a4cb254..bff2d3f544c4 100644
--- a/packages/google-cloud-assured-workloads/README.rst
+++ b/packages/google-cloud-assured-workloads/README.rst
@@ -15,7 +15,7 @@ Python Client for Assured Workloads for Government
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-assured-workloads.svg
    :target: https://pypi.org/project/google-cloud-assured-workloads/
 .. _Assured Workloads for Government: https://cloud.google.com/assured-workloads/
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/assuredworkloads/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/assuredworkloads/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/assured-workloads/
 
 Quick Start
diff --git a/packages/google-cloud-assured-workloads/docs/index.rst b/packages/google-cloud-assured-workloads/docs/index.rst
index d6e3e20ec20a..b16319e41e54 100644
--- a/packages/google-cloud-assured-workloads/docs/index.rst
+++ b/packages/google-cloud-assured-workloads/docs/index.rst
@@ -32,3 +32,8 @@ For a list of all ``google-cloud-assured-workloads`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-assured-workloads/docs/summary_overview.md b/packages/google-cloud-assured-workloads/docs/summary_overview.md
new file mode 100644
index 000000000000..905ca17d6e7b
--- /dev/null
+++ b/packages/google-cloud-assured-workloads/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# Assured Workloads for Government API
+
+Overview of the APIs available for Assured Workloads for Government API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+Assured Workloads for Government API.
+
+[classes](https://cloud.google.com/python/docs/reference/assuredworkloads/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/assuredworkloads/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/assuredworkloads/latest/summary_property.html)
diff --git a/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1/services/assured_workloads_service/transports/base.py b/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1/services/assured_workloads_service/transports/base.py
index c57a05464684..abb37ad842d7 100644
--- a/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1/services/assured_workloads_service/transports/base.py
+++ b/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1/services/assured_workloads_service/transports/base.py
@@ -83,6 +83,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -95,7 +97,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1/services/assured_workloads_service/transports/grpc.py b/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1/services/assured_workloads_service/transports/grpc.py
index 3ed22ea213d8..24d0519b8436 100644
--- a/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1/services/assured_workloads_service/transports/grpc.py
+++ b/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1/services/assured_workloads_service/transports/grpc.py
@@ -124,7 +124,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1/services/assured_workloads_service/transports/grpc_asyncio.py b/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1/services/assured_workloads_service/transports/grpc_asyncio.py
index 0202470c076c..ec1f1748da71 100644
--- a/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1/services/assured_workloads_service/transports/grpc_asyncio.py
+++ b/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1/services/assured_workloads_service/transports/grpc_asyncio.py
@@ -171,7 +171,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1beta1/services/assured_workloads_service/transports/base.py b/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1beta1/services/assured_workloads_service/transports/base.py
index ed352aaa03c8..b0b01436f7ae 100644
--- a/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1beta1/services/assured_workloads_service/transports/base.py
+++ b/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1beta1/services/assured_workloads_service/transports/base.py
@@ -83,6 +83,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -95,7 +97,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1beta1/services/assured_workloads_service/transports/grpc.py b/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1beta1/services/assured_workloads_service/transports/grpc.py
index e13a82ae0696..7b9c39677387 100644
--- a/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1beta1/services/assured_workloads_service/transports/grpc.py
+++ b/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1beta1/services/assured_workloads_service/transports/grpc.py
@@ -124,7 +124,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1beta1/services/assured_workloads_service/transports/grpc_asyncio.py b/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1beta1/services/assured_workloads_service/transports/grpc_asyncio.py
index b57ffea54938..c779ae4c4549 100644
--- a/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1beta1/services/assured_workloads_service/transports/grpc_asyncio.py
+++ b/packages/google-cloud-assured-workloads/google/cloud/assuredworkloads_v1beta1/services/assured_workloads_service/transports/grpc_asyncio.py
@@ -171,7 +171,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-assured-workloads/noxfile.py b/packages/google-cloud-assured-workloads/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-assured-workloads/noxfile.py
+++ b/packages/google-cloud-assured-workloads/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-assured-workloads/setup.py b/packages/google-cloud-assured-workloads/setup.py
index ac2ab32693e1..1cdde30aa99f 100644
--- a/packages/google-cloud-assured-workloads/setup.py
+++ b/packages/google-cloud-assured-workloads/setup.py
@@ -46,7 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-assured-workloads"
 
diff --git a/packages/google-cloud-assured-workloads/testing/constraints-3.7.txt b/packages/google-cloud-assured-workloads/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-cloud-assured-workloads/testing/constraints-3.7.txt
+++ b/packages/google-cloud-assured-workloads/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-cloud-assured-workloads/tests/unit/gapic/assuredworkloads_v1/test_assured_workloads_service.py b/packages/google-cloud-assured-workloads/tests/unit/gapic/assuredworkloads_v1/test_assured_workloads_service.py
index 43d367655a83..54c3fdc16e1b 100644
--- a/packages/google-cloud-assured-workloads/tests/unit/gapic/assuredworkloads_v1/test_assured_workloads_service.py
+++ b/packages/google-cloud-assured-workloads/tests/unit/gapic/assuredworkloads_v1/test_assured_workloads_service.py
@@ -1366,12 +1366,7 @@ async def test_create_workload_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_workload
         ] = mock_object
@@ -1778,12 +1773,7 @@ async def test_update_workload_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_workload
         ] = mock_object
@@ -2190,12 +2180,7 @@ async def test_restrict_allowed_resources_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.restrict_allowed_resources
         ] = mock_object
@@ -2476,12 +2461,7 @@ async def test_delete_workload_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_workload
         ] = mock_object
@@ -2872,12 +2852,7 @@ async def test_get_workload_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_workload
         ] = mock_object
@@ -3270,12 +3245,7 @@ async def test_list_workloads_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_workloads
         ] = mock_object
@@ -3833,12 +3803,7 @@ async def test_list_violations_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_violations
         ] = mock_object
@@ -4352,12 +4317,7 @@ async def test_get_violation_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_violation
         ] = mock_object
@@ -4688,12 +4648,7 @@ async def test_acknowledge_violation_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.acknowledge_violation
         ] = mock_object
diff --git a/packages/google-cloud-assured-workloads/tests/unit/gapic/assuredworkloads_v1beta1/test_assured_workloads_service.py b/packages/google-cloud-assured-workloads/tests/unit/gapic/assuredworkloads_v1beta1/test_assured_workloads_service.py
index 46fb11dae5ed..424093c5e51a 100644
--- a/packages/google-cloud-assured-workloads/tests/unit/gapic/assuredworkloads_v1beta1/test_assured_workloads_service.py
+++ b/packages/google-cloud-assured-workloads/tests/unit/gapic/assuredworkloads_v1beta1/test_assured_workloads_service.py
@@ -1366,12 +1366,7 @@ async def test_create_workload_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_workload
         ] = mock_object
@@ -1775,12 +1770,7 @@ async def test_update_workload_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.update_workload
         ] = mock_object
@@ -2124,12 +2114,7 @@ async def test_restrict_allowed_resources_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.restrict_allowed_resources
         ] = mock_object
@@ -2410,12 +2395,7 @@ async def test_delete_workload_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_workload
         ] = mock_object
@@ -2803,12 +2783,7 @@ async def test_get_workload_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_workload
         ] = mock_object
@@ -3151,12 +3126,7 @@ async def test_analyze_workload_move_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.analyze_workload_move
         ] = mock_object
@@ -3476,12 +3446,7 @@ async def test_list_workloads_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_workloads
         ] = mock_object