diff --git a/packages/google-cloud-iap/.coveragerc b/packages/google-cloud-iap/.coveragerc
index f9b9e0f1db39..d4c2f3be4e6d 100644
--- a/packages/google-cloud-iap/.coveragerc
+++ b/packages/google-cloud-iap/.coveragerc
@@ -10,8 +10,3 @@ exclude_lines =
     pragma: NO COVER
     # Ignore debug-only repr
     def __repr__
-    # Ignore pkg_resources exceptions.
-    # This is added at the module level as a safeguard for if someone
-    # generates the code and tries to run it without pip installing. This
-    # makes it virtually impossible to test properly.
-    except pkg_resources.DistributionNotFound
diff --git a/packages/google-cloud-iap/google/cloud/iap_v1/gapic_version.py b/packages/google-cloud-iap/google/cloud/iap_v1/gapic_version.py
new file mode 100644
index 000000000000..afd6fcfa0d51
--- /dev/null
+++ b/packages/google-cloud-iap/google/cloud/iap_v1/gapic_version.py
@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+__version__ = "1.5.4"  # {x-release-please-version}
diff --git a/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_admin_service/async_client.py b/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_admin_service/async_client.py
index 1e46601e4834..bf26a8ef736e 100644
--- a/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_admin_service/async_client.py
+++ b/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_admin_service/async_client.py
@@ -34,7 +34,8 @@
 from google.api_core.client_options import ClientOptions
 from google.auth import credentials as ga_credentials  # type: ignore
 from google.oauth2 import service_account  # type: ignore
-import pkg_resources
+
+from google.cloud.iap_v1 import gapic_version as package_version
 
 try:
     OptionalRetry = Union[retries.Retry, gapic_v1.method._MethodDefault]
@@ -242,7 +243,7 @@ async def set_iam_policy(
         request: Optional[Union[iam_policy_pb2.SetIamPolicyRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> policy_pb2.Policy:
         r"""Sets the access control policy for an Identity-Aware Proxy
@@ -388,7 +389,7 @@ async def get_iam_policy(
         request: Optional[Union[iam_policy_pb2.GetIamPolicyRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> policy_pb2.Policy:
         r"""Gets the access control policy for an Identity-Aware Proxy
@@ -534,7 +535,7 @@ async def test_iam_permissions(
         request: Optional[Union[iam_policy_pb2.TestIamPermissionsRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> iam_policy_pb2.TestIamPermissionsResponse:
         r"""Returns permissions that a caller has on the Identity-Aware
@@ -620,7 +621,7 @@ async def get_iap_settings(
         request: Optional[Union[service.GetIapSettingsRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.IapSettings:
         r"""Gets the IAP settings on a particular IAP protected
@@ -698,7 +699,7 @@ async def update_iap_settings(
         request: Optional[Union[service.UpdateIapSettingsRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.IapSettings:
         r"""Updates the IAP settings on a particular IAP protected resource.
@@ -783,7 +784,7 @@ async def list_tunnel_dest_groups(
         *,
         parent: Optional[str] = None,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> pagers.ListTunnelDestGroupsAsyncPager:
         r"""Lists the existing TunnelDestGroups. To group across all
@@ -904,7 +905,7 @@ async def create_tunnel_dest_group(
         tunnel_dest_group: Optional[service.TunnelDestGroup] = None,
         tunnel_dest_group_id: Optional[str] = None,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.TunnelDestGroup:
         r"""Creates a new TunnelDestGroup.
@@ -1031,7 +1032,7 @@ async def get_tunnel_dest_group(
         *,
         name: Optional[str] = None,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.TunnelDestGroup:
         r"""Retrieves an existing TunnelDestGroup.
@@ -1131,7 +1132,7 @@ async def delete_tunnel_dest_group(
         *,
         name: Optional[str] = None,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> None:
         r"""Deletes a TunnelDestGroup.
@@ -1223,7 +1224,7 @@ async def update_tunnel_dest_group(
         tunnel_dest_group: Optional[service.TunnelDestGroup] = None,
         update_mask: Optional[field_mask_pb2.FieldMask] = None,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.TunnelDestGroup:
         r"""Updates a TunnelDestGroup.
@@ -1340,14 +1341,9 @@ async def __aexit__(self, exc_type, exc, tb):
         await self.transport.close()
 
 
-try:
-    DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
-        gapic_version=pkg_resources.get_distribution(
-            "google-cloud-iap",
-        ).version,
-    )
-except pkg_resources.DistributionNotFound:
-    DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo()
+DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
+    gapic_version=package_version.__version__
+)
 
 
 __all__ = ("IdentityAwareProxyAdminServiceAsyncClient",)
diff --git a/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_admin_service/client.py b/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_admin_service/client.py
index 634fb06cd951..2c8ff4ec0f46 100644
--- a/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_admin_service/client.py
+++ b/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_admin_service/client.py
@@ -38,7 +38,8 @@
 from google.auth.transport import mtls  # type: ignore
 from google.auth.transport.grpc import SslCredentials  # type: ignore
 from google.oauth2 import service_account  # type: ignore
-import pkg_resources
+
+from google.cloud.iap_v1 import gapic_version as package_version
 
 try:
     OptionalRetry = Union[retries.Retry, gapic_v1.method._MethodDefault]
@@ -475,7 +476,7 @@ def set_iam_policy(
         request: Optional[Union[iam_policy_pb2.SetIamPolicyRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> policy_pb2.Policy:
         r"""Sets the access control policy for an Identity-Aware Proxy
@@ -620,7 +621,7 @@ def get_iam_policy(
         request: Optional[Union[iam_policy_pb2.GetIamPolicyRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> policy_pb2.Policy:
         r"""Gets the access control policy for an Identity-Aware Proxy
@@ -765,7 +766,7 @@ def test_iam_permissions(
         request: Optional[Union[iam_policy_pb2.TestIamPermissionsRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> iam_policy_pb2.TestIamPermissionsResponse:
         r"""Returns permissions that a caller has on the Identity-Aware
@@ -850,7 +851,7 @@ def get_iap_settings(
         request: Optional[Union[service.GetIapSettingsRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.IapSettings:
         r"""Gets the IAP settings on a particular IAP protected
@@ -929,7 +930,7 @@ def update_iap_settings(
         request: Optional[Union[service.UpdateIapSettingsRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.IapSettings:
         r"""Updates the IAP settings on a particular IAP protected resource.
@@ -1015,7 +1016,7 @@ def list_tunnel_dest_groups(
         *,
         parent: Optional[str] = None,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> pagers.ListTunnelDestGroupsPager:
         r"""Lists the existing TunnelDestGroups. To group across all
@@ -1136,7 +1137,7 @@ def create_tunnel_dest_group(
         tunnel_dest_group: Optional[service.TunnelDestGroup] = None,
         tunnel_dest_group_id: Optional[str] = None,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.TunnelDestGroup:
         r"""Creates a new TunnelDestGroup.
@@ -1263,7 +1264,7 @@ def get_tunnel_dest_group(
         *,
         name: Optional[str] = None,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.TunnelDestGroup:
         r"""Retrieves an existing TunnelDestGroup.
@@ -1363,7 +1364,7 @@ def delete_tunnel_dest_group(
         *,
         name: Optional[str] = None,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> None:
         r"""Deletes a TunnelDestGroup.
@@ -1455,7 +1456,7 @@ def update_tunnel_dest_group(
         tunnel_dest_group: Optional[service.TunnelDestGroup] = None,
         update_mask: Optional[field_mask_pb2.FieldMask] = None,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.TunnelDestGroup:
         r"""Updates a TunnelDestGroup.
@@ -1579,14 +1580,9 @@ def __exit__(self, type, value, traceback):
         self.transport.close()
 
 
-try:
-    DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
-        gapic_version=pkg_resources.get_distribution(
-            "google-cloud-iap",
-        ).version,
-    )
-except pkg_resources.DistributionNotFound:
-    DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo()
+DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
+    gapic_version=package_version.__version__
+)
 
 
 __all__ = ("IdentityAwareProxyAdminServiceClient",)
diff --git a/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_admin_service/transports/base.py b/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_admin_service/transports/base.py
index c04088ebac87..9e5553c3327c 100644
--- a/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_admin_service/transports/base.py
+++ b/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_admin_service/transports/base.py
@@ -26,18 +26,13 @@
 from google.iam.v1 import policy_pb2  # type: ignore
 from google.oauth2 import service_account  # type: ignore
 from google.protobuf import empty_pb2  # type: ignore
-import pkg_resources
 
+from google.cloud.iap_v1 import gapic_version as package_version
 from google.cloud.iap_v1.types import service
 
-try:
-    DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
-        gapic_version=pkg_resources.get_distribution(
-            "google-cloud-iap",
-        ).version,
-    )
-except pkg_resources.DistributionNotFound:
-    DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo()
+DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
+    gapic_version=package_version.__version__
+)
 
 
 class IdentityAwareProxyAdminServiceTransport(abc.ABC):
diff --git a/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_o_auth_service/async_client.py b/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_o_auth_service/async_client.py
index ae8117321539..c569acc53b29 100644
--- a/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_o_auth_service/async_client.py
+++ b/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_o_auth_service/async_client.py
@@ -34,7 +34,8 @@
 from google.api_core.client_options import ClientOptions
 from google.auth import credentials as ga_credentials  # type: ignore
 from google.oauth2 import service_account  # type: ignore
-import pkg_resources
+
+from google.cloud.iap_v1 import gapic_version as package_version
 
 try:
     OptionalRetry = Union[retries.Retry, gapic_v1.method._MethodDefault]
@@ -229,7 +230,7 @@ async def list_brands(
         request: Optional[Union[service.ListBrandsRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.ListBrandsResponse:
         r"""Lists the existing brands for the project.
@@ -306,7 +307,7 @@ async def create_brand(
         request: Optional[Union[service.CreateBrandRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.Brand:
         r"""Constructs a new OAuth brand for the project if one
@@ -395,7 +396,7 @@ async def get_brand(
         request: Optional[Union[service.GetBrandRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.Brand:
         r"""Retrieves the OAuth brand of the project.
@@ -477,7 +478,7 @@ async def create_identity_aware_proxy_client(
         ] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.IdentityAwareProxyClient:
         r"""Creates an Identity Aware Proxy (IAP) OAuth client.
@@ -562,7 +563,7 @@ async def list_identity_aware_proxy_clients(
         ] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> pagers.ListIdentityAwareProxyClientsAsyncPager:
         r"""Lists the existing clients for the brand.
@@ -657,7 +658,7 @@ async def get_identity_aware_proxy_client(
         ] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.IdentityAwareProxyClient:
         r"""Retrieves an Identity Aware Proxy (IAP) OAuth client.
@@ -740,7 +741,7 @@ async def reset_identity_aware_proxy_client_secret(
         ] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.IdentityAwareProxyClient:
         r"""Resets an Identity Aware Proxy (IAP) OAuth client
@@ -824,7 +825,7 @@ async def delete_identity_aware_proxy_client(
         ] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> None:
         r"""Deletes an Identity Aware Proxy (IAP) OAuth client.
@@ -897,14 +898,9 @@ async def __aexit__(self, exc_type, exc, tb):
         await self.transport.close()
 
 
-try:
-    DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
-        gapic_version=pkg_resources.get_distribution(
-            "google-cloud-iap",
-        ).version,
-    )
-except pkg_resources.DistributionNotFound:
-    DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo()
+DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
+    gapic_version=package_version.__version__
+)
 
 
 __all__ = ("IdentityAwareProxyOAuthServiceAsyncClient",)
diff --git a/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_o_auth_service/client.py b/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_o_auth_service/client.py
index fe09e9d0642a..3bf03eb226d2 100644
--- a/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_o_auth_service/client.py
+++ b/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_o_auth_service/client.py
@@ -38,7 +38,8 @@
 from google.auth.transport import mtls  # type: ignore
 from google.auth.transport.grpc import SslCredentials  # type: ignore
 from google.oauth2 import service_account  # type: ignore
-import pkg_resources
+
+from google.cloud.iap_v1 import gapic_version as package_version
 
 try:
     OptionalRetry = Union[retries.Retry, gapic_v1.method._MethodDefault]
@@ -433,7 +434,7 @@ def list_brands(
         request: Optional[Union[service.ListBrandsRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.ListBrandsResponse:
         r"""Lists the existing brands for the project.
@@ -511,7 +512,7 @@ def create_brand(
         request: Optional[Union[service.CreateBrandRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.Brand:
         r"""Constructs a new OAuth brand for the project if one
@@ -601,7 +602,7 @@ def get_brand(
         request: Optional[Union[service.GetBrandRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.Brand:
         r"""Retrieves the OAuth brand of the project.
@@ -684,7 +685,7 @@ def create_identity_aware_proxy_client(
         ] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.IdentityAwareProxyClient:
         r"""Creates an Identity Aware Proxy (IAP) OAuth client.
@@ -772,7 +773,7 @@ def list_identity_aware_proxy_clients(
         ] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> pagers.ListIdentityAwareProxyClientsPager:
         r"""Lists the existing clients for the brand.
@@ -870,7 +871,7 @@ def get_identity_aware_proxy_client(
         ] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.IdentityAwareProxyClient:
         r"""Retrieves an Identity Aware Proxy (IAP) OAuth client.
@@ -956,7 +957,7 @@ def reset_identity_aware_proxy_client_secret(
         ] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> service.IdentityAwareProxyClient:
         r"""Resets an Identity Aware Proxy (IAP) OAuth client
@@ -1043,7 +1044,7 @@ def delete_identity_aware_proxy_client(
         ] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
-        timeout: Optional[float] = None,
+        timeout: Union[float, object] = gapic_v1.method.DEFAULT,
         metadata: Sequence[Tuple[str, str]] = (),
     ) -> None:
         r"""Deletes an Identity Aware Proxy (IAP) OAuth client.
@@ -1126,14 +1127,9 @@ def __exit__(self, type, value, traceback):
         self.transport.close()
 
 
-try:
-    DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
-        gapic_version=pkg_resources.get_distribution(
-            "google-cloud-iap",
-        ).version,
-    )
-except pkg_resources.DistributionNotFound:
-    DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo()
+DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
+    gapic_version=package_version.__version__
+)
 
 
 __all__ = ("IdentityAwareProxyOAuthServiceClient",)
diff --git a/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_o_auth_service/transports/base.py b/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_o_auth_service/transports/base.py
index 84b7a3430417..ccce69f47bf9 100644
--- a/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_o_auth_service/transports/base.py
+++ b/packages/google-cloud-iap/google/cloud/iap_v1/services/identity_aware_proxy_o_auth_service/transports/base.py
@@ -24,18 +24,13 @@
 from google.auth import credentials as ga_credentials  # type: ignore
 from google.oauth2 import service_account  # type: ignore
 from google.protobuf import empty_pb2  # type: ignore
-import pkg_resources
 
+from google.cloud.iap_v1 import gapic_version as package_version
 from google.cloud.iap_v1.types import service
 
-try:
-    DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
-        gapic_version=pkg_resources.get_distribution(
-            "google-cloud-iap",
-        ).version,
-    )
-except pkg_resources.DistributionNotFound:
-    DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo()
+DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
+    gapic_version=package_version.__version__
+)
 
 
 class IdentityAwareProxyOAuthServiceTransport(abc.ABC):
diff --git a/packages/google-cloud-iap/release-please-config.json b/packages/google-cloud-iap/release-please-config.json
index 75279fc5fcb2..4b7d19b5f211 100644
--- a/packages/google-cloud-iap/release-please-config.json
+++ b/packages/google-cloud-iap/release-please-config.json
@@ -5,6 +5,7 @@
       "release-type": "python",
       "extra-files": [
         "google/cloud/iap/gapic_version.py",
+        "google/cloud/iap_v1/gapic_version.py",
         {
           "type": "json",
           "path": "samples/generated_samples/snippet_metadata_google.cloud.iap.v1.json",
diff --git a/packages/google-cloud-iap/setup.py b/packages/google-cloud-iap/setup.py
index 8bd091334a0a..88209dbec27b 100644
--- a/packages/google-cloud-iap/setup.py
+++ b/packages/google-cloud-iap/setup.py
@@ -36,7 +36,7 @@
     release_status = "Development Status :: 5 - Production/Stable"
 
 dependencies = [
-    "google-api-core[grpc] >= 1.33.2, <3.0.0dev,!=2.0.*,!=2.1.*,!=2.2.*,!=2.3.*,!=2.4.*,!=2.5.*,!=2.6.*,!=2.7.*",
+    "google-api-core[grpc] >= 1.34.0, <3.0.0dev,!=2.0.*,!=2.1.*,!=2.2.*,!=2.3.*,!=2.4.*,!=2.5.*,!=2.6.*,!=2.7.*,!=2.8.*,!=2.9.*,!=2.10.*",
     "proto-plus >= 1.22.0, <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",
     "grpc-google-iam-v1 >= 0.12.4, < 1.0.0dev",
diff --git a/packages/google-cloud-iap/testing/constraints-3.7.txt b/packages/google-cloud-iap/testing/constraints-3.7.txt
index 883a87aefd06..2beecf99e0be 100644
--- a/packages/google-cloud-iap/testing/constraints-3.7.txt
+++ b/packages/google-cloud-iap/testing/constraints-3.7.txt
@@ -4,7 +4,7 @@
 # Pin the version to the lower bound.
 # e.g., if setup.py has "google-cloud-foo >= 1.14.0, < 2.0.0dev",
 # Then this file should have google-cloud-foo==1.14.0
-google-api-core==1.33.2
+google-api-core==1.34.0
 proto-plus==1.22.0
 protobuf==3.19.5
 grpc-google-iam-v1==0.12.4