diff --git a/CHANGELOG.md b/CHANGELOG.md
index dc988648..13679bf0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,14 @@
 
 [1]: https://pypi.org/project/google-cloud-container/#history
 
+## [2.6.0](https://www.github.com/googleapis/python-container/compare/v2.5.0...v2.6.0) (2021-07-09)
+
+
+### Features
+
+* allow updating security group on existing clusters ([#120](https://www.github.com/googleapis/python-container/issues/120)) ([28a3fc9](https://www.github.com/googleapis/python-container/commit/28a3fc94cd7587b5900408bbadf994f143b0d0c3))
+* allow updating security group on existing clusters ([#123](https://www.github.com/googleapis/python-container/issues/123)) ([e0d70e9](https://www.github.com/googleapis/python-container/commit/e0d70e98991eec24880497516829a0d4ed1dbc18))
+
 ## [2.5.0](https://www.github.com/googleapis/python-container/compare/v2.4.1...v2.5.0) (2021-06-30)
 
 
diff --git a/google/cloud/container_v1/services/cluster_manager/async_client.py b/google/cloud/container_v1/services/cluster_manager/async_client.py
index a98c7a65..e2af7b28 100644
--- a/google/cloud/container_v1/services/cluster_manager/async_client.py
+++ b/google/cloud/container_v1/services/cluster_manager/async_client.py
@@ -1212,7 +1212,7 @@ async def set_locations(
 
         """
         warnings.warn(
-            "ClusterManagerAsyncClient.set_locations is deprecated", DeprecationWarning,
+            "ClusterManagerAsyncClient.set_locations is deprecated", DeprecationWarning
         )
 
         # Create or coerce a protobuf request object.
diff --git a/google/cloud/container_v1/services/cluster_manager/client.py b/google/cloud/container_v1/services/cluster_manager/client.py
index 2121fb09..fe0a1abf 100644
--- a/google/cloud/container_v1/services/cluster_manager/client.py
+++ b/google/cloud/container_v1/services/cluster_manager/client.py
@@ -1367,7 +1367,7 @@ def set_locations(
 
         """
         warnings.warn(
-            "ClusterManagerClient.set_locations is deprecated", DeprecationWarning,
+            "ClusterManagerClient.set_locations is deprecated", DeprecationWarning
         )
 
         # Create or coerce a protobuf request object.
diff --git a/google/cloud/container_v1/types/cluster_service.py b/google/cloud/container_v1/types/cluster_service.py
index 79450e44..6029eade 100644
--- a/google/cloud/container_v1/types/cluster_service.py
+++ b/google/cloud/container_v1/types/cluster_service.py
@@ -1401,6 +1401,9 @@ class ClusterUpdate(proto.Message):
             default sNAT for this cluster.
         desired_release_channel (google.cloud.container_v1.types.ReleaseChannel):
             The desired release channel configuration.
+        desired_authenticator_groups_config (google.cloud.container_v1.types.AuthenticatorGroupsConfig):
+            The desired authenticator groups config for
+            the cluster.
         desired_master_version (str):
             The Kubernetes version to change the master
             to.
@@ -1464,6 +1467,9 @@ class ClusterUpdate(proto.Message):
     desired_release_channel = proto.Field(
         proto.MESSAGE, number=31, message="ReleaseChannel",
     )
+    desired_authenticator_groups_config = proto.Field(
+        proto.MESSAGE, number=63, message="AuthenticatorGroupsConfig",
+    )
     desired_master_version = proto.Field(proto.STRING, number=100,)
 
 
diff --git a/google/cloud/container_v1beta1/services/cluster_manager/async_client.py b/google/cloud/container_v1beta1/services/cluster_manager/async_client.py
index 5364ea41..ee546eed 100644
--- a/google/cloud/container_v1beta1/services/cluster_manager/async_client.py
+++ b/google/cloud/container_v1beta1/services/cluster_manager/async_client.py
@@ -1132,7 +1132,7 @@ async def set_locations(
 
         """
         warnings.warn(
-            "ClusterManagerAsyncClient.set_locations is deprecated", DeprecationWarning,
+            "ClusterManagerAsyncClient.set_locations is deprecated", DeprecationWarning
         )
 
         # Create or coerce a protobuf request object.
diff --git a/google/cloud/container_v1beta1/services/cluster_manager/client.py b/google/cloud/container_v1beta1/services/cluster_manager/client.py
index 21de5071..cba81caf 100644
--- a/google/cloud/container_v1beta1/services/cluster_manager/client.py
+++ b/google/cloud/container_v1beta1/services/cluster_manager/client.py
@@ -1296,7 +1296,7 @@ def set_locations(
 
         """
         warnings.warn(
-            "ClusterManagerClient.set_locations is deprecated", DeprecationWarning,
+            "ClusterManagerClient.set_locations is deprecated", DeprecationWarning
         )
 
         # Create or coerce a protobuf request object.
diff --git a/google/cloud/container_v1beta1/types/cluster_service.py b/google/cloud/container_v1beta1/types/cluster_service.py
index c40014d1..58969874 100644
--- a/google/cloud/container_v1beta1/types/cluster_service.py
+++ b/google/cloud/container_v1beta1/types/cluster_service.py
@@ -1720,6 +1720,9 @@ class ClusterUpdate(proto.Message):
             Configuration for Shielded Nodes.
         desired_master (google.cloud.container_v1beta1.types.Master):
             Configuration for master components.
+        desired_authenticator_groups_config (google.cloud.container_v1beta1.types.AuthenticatorGroupsConfig):
+            AuthenticatorGroupsConfig specifies the
+            config for the cluster security groups settings.
     """
 
     desired_node_version = proto.Field(proto.STRING, number=4,)
@@ -1785,6 +1788,9 @@ class ClusterUpdate(proto.Message):
         proto.MESSAGE, number=48, message="ShieldedNodes",
     )
     desired_master = proto.Field(proto.MESSAGE, number=52, message="Master",)
+    desired_authenticator_groups_config = proto.Field(
+        proto.MESSAGE, number=63, message="AuthenticatorGroupsConfig",
+    )
 
 
 class Operation(proto.Message):
diff --git a/setup.py b/setup.py
index 206956c8..e7de00d2 100644
--- a/setup.py
+++ b/setup.py
@@ -22,7 +22,7 @@
 
 name = "google-cloud-container"
 description = "Google Container Engine API client library"
-version = "2.5.0"
+version = "2.6.0"
 # Should be one of:
 # 'Development Status :: 3 - Alpha'
 # 'Development Status :: 4 - Beta'