diff --git a/iam/google/cloud/iam_credentials_v1/proto/common_pb2.py b/iam/google/cloud/iam_credentials_v1/proto/common_pb2.py
index e643c6454e0e..ceaf9d73dbab 100644
--- a/iam/google/cloud/iam_credentials_v1/proto/common_pb2.py
+++ b/iam/google/cloud/iam_credentials_v1/proto/common_pb2.py
@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: google/iam/credentials/v1/common.proto
 
diff --git a/iam/google/cloud/iam_credentials_v1/proto/iamcredentials_pb2.py b/iam/google/cloud/iam_credentials_v1/proto/iamcredentials_pb2.py
index ba7e205d58e2..97835d0d3d6e 100644
--- a/iam/google/cloud/iam_credentials_v1/proto/iamcredentials_pb2.py
+++ b/iam/google/cloud/iam_credentials_v1/proto/iamcredentials_pb2.py
@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: google/iam/credentials/v1/iamcredentials.proto
 
diff --git a/iam/synth.metadata b/iam/synth.metadata
index 5b1d90559615..cc6eaae14413 100644
--- a/iam/synth.metadata
+++ b/iam/synth.metadata
@@ -1,19 +1,19 @@
 {
-  "updateTime": "2019-06-14T12:20:09.908653Z",
+  "updateTime": "2019-06-15T12:19:55.863015Z",
   "sources": [
     {
       "generator": {
         "name": "artman",
-        "version": "0.25.0",
-        "dockerImage": "googleapis/artman@sha256:ef1a98ab1e2b8f05f4d9a56f27d63347aefe14020e5f2d585172b14ca76f1d90"
+        "version": "0.26.0",
+        "dockerImage": "googleapis/artman@sha256:6db0735b0d3beec5b887153a2a7c7411fc7bb53f73f6f389a822096bd14a3a15"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "c23b68eecb00c4d285a730a49b1d7d943cd56183",
-        "internalRef": "253113405"
+        "sha": "7b58b37559f6a5337c4c564518e9573d742df225",
+        "internalRef": "253322136"
       }
     },
     {