diff --git a/packages/google-cloud-iam/google/cloud/iam_credentials_v1/gapic/transports/iam_credentials_grpc_transport.py b/packages/google-cloud-iam/google/cloud/iam_credentials_v1/gapic/transports/iam_credentials_grpc_transport.py
index 952b98f1fa43..b18ddda34df4 100644
--- a/packages/google-cloud-iam/google/cloud/iam_credentials_v1/gapic/transports/iam_credentials_grpc_transport.py
+++ b/packages/google-cloud-iam/google/cloud/iam_credentials_v1/gapic/transports/iam_credentials_grpc_transport.py
@@ -73,7 +73,7 @@ def __init__(
 
     @classmethod
     def create_channel(
-        cls, address="iamcredentials.googleapis.com:443", credentials=None
+        cls, address="iamcredentials.googleapis.com:443", credentials=None, **kwargs
     ):
         """Create and return a gRPC channel object.
 
@@ -84,12 +84,14 @@ def create_channel(
                 credentials identify this application to the service. If
                 none are specified, the client will attempt to ascertain
                 the credentials from the environment.
+            kwargs (dict): Keyword arguments, which are passed to the
+                channel creation.
 
         Returns:
             grpc.Channel: A gRPC channel object.
         """
         return google.api_core.grpc_helpers.create_channel(
-            address, credentials=credentials, scopes=cls._OAUTH_SCOPES
+            address, credentials=credentials, scopes=cls._OAUTH_SCOPES, **kwargs
         )
 
     @property
diff --git a/packages/google-cloud-iam/synth.metadata b/packages/google-cloud-iam/synth.metadata
index cc6eaae14413..e5dfdce13dff 100644
--- a/packages/google-cloud-iam/synth.metadata
+++ b/packages/google-cloud-iam/synth.metadata
@@ -1,19 +1,19 @@
 {
-  "updateTime": "2019-06-15T12:19:55.863015Z",
+  "updateTime": "2019-06-18T12:19:15.743900Z",
   "sources": [
     {
       "generator": {
         "name": "artman",
-        "version": "0.26.0",
-        "dockerImage": "googleapis/artman@sha256:6db0735b0d3beec5b887153a2a7c7411fc7bb53f73f6f389a822096bd14a3a15"
+        "version": "0.27.0",
+        "dockerImage": "googleapis/artman@sha256:b036a7f4278d9deb5796f065e5c7f608d47d75369985ca7ab5039998120e972d"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "7b58b37559f6a5337c4c564518e9573d742df225",
-        "internalRef": "253322136"
+        "sha": "384aa843867c4d17756d14a01f047b6368494d32",
+        "internalRef": "253675319"
       }
     },
     {