diff --git a/iam/noxfile.py b/iam/noxfile.py
index bfac9f4c2bce..d692cf37f39c 100644
--- a/iam/noxfile.py
+++ b/iam/noxfile.py
@@ -45,6 +45,10 @@ def blacken(session):
     """Run black.
 
     Format code to uniform standard.
+    
+    This currently uses Python 3.6 due to the automated Kokoro run of synthtool.
+    That run uses an image that doesn't have 3.6 installed. Before updating this
+    check the state of the `gcp_ubuntu_config` we use for that Kokoro run.
     """
     session.install("black")
     session.run(
diff --git a/iam/synth.metadata b/iam/synth.metadata
index 45bffa3ad41b..d2f1b6b617b3 100644
--- a/iam/synth.metadata
+++ b/iam/synth.metadata
@@ -1,19 +1,19 @@
 {
-  "updateTime": "2019-02-02T13:20:12.310469Z",
+  "updateTime": "2019-02-20T18:06:09.970553Z",
   "sources": [
     {
       "generator": {
         "name": "artman",
-        "version": "0.16.8",
-        "dockerImage": "googleapis/artman@sha256:75bc07ef34a1de9895c18af54dc503ed3b3f3b52e85062e3360a979d2a0741e7"
+        "version": "0.16.13",
+        "dockerImage": "googleapis/artman@sha256:5fd9aee1d82a00cebf425c8fa431f5457539562f5867ad9c54370f0ec9a7ccaa"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "bce093dab3e65c40eb9a37efbdc960f34df6037a",
-        "internalRef": "231974277"
+        "sha": "18ab81eec27942a942622d5a8d9c9e7a202e8c16",
+        "internalRef": "234814197"
       }
     },
     {