---
 tests/compute_engine/test__metadata.py         |    2 +-
 tests/compute_engine/test_credentials.py       |    2 +-
 tests/conftest.py                              |    2 +-
 tests/crypt/test__python_rsa.py                |    2 +-
 tests/oauth2/test__client.py                   |    2 +-
 tests/oauth2/test_challenges.py                |    2 +-
 tests/oauth2/test_credentials.py               |    2 +-
 tests/oauth2/test_gdch_credentials.py          |    2 +-
 tests/oauth2/test_id_token.py                  |    2 +-
 tests/oauth2/test_reauth.py                    |    2 +-
 tests/oauth2/test_service_account.py           |    2 +-
 tests/oauth2/test_sts.py                       |    2 +-
 tests/test__cloud_sdk.py                       |    2 +-
 tests/test__default.py                         |    2 +-
 tests/test__exponential_backoff.py             |    2 +-
 tests/test__oauth2client.py                    |    2 +-
 tests/test_app_engine.py                       |    2 +-
 tests/test_aws.py                              |    2 +-
 tests/test_downscoped.py                       |    2 +-
 tests/test_external_account.py                 |    2 +-
 tests/test_external_account_authorized_user.py |    2 +-
 tests/test_iam.py                              |    2 +-
 tests/test_identity_pool.py                    |    2 +-
 tests/test_impersonated_credentials.py         |    2 +-
 tests/test_jwt.py                              |    2 +-
 tests/test_pluggable.py                        |    2 +-
 tests/transport/test__custom_tls_signer.py     |    2 +-
 tests/transport/test__mtls_helper.py           |    2 +-
 tests/transport/test_grpc.py                   |    2 +-
 tests/transport/test_mtls.py                   |    2 +-
 tests/transport/test_requests.py               |    2 +-
 tests/transport/test_urllib3.py                |    2 +-
 32 files changed, 32 insertions(+), 32 deletions(-)

--- a/tests/compute_engine/test__metadata.py
+++ b/tests/compute_engine/test__metadata.py
@@ -16,7 +16,7 @@ import datetime
 import json
 import os
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 from six.moves import http_client
 from six.moves import reload_module
--- a/tests/compute_engine/test_credentials.py
+++ b/tests/compute_engine/test_credentials.py
@@ -14,7 +14,7 @@
 import base64
 import datetime
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 import responses  # type: ignore
 
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -15,7 +15,7 @@
 import os
 import sys
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 
 
--- a/tests/crypt/test__python_rsa.py
+++ b/tests/crypt/test__python_rsa.py
@@ -15,7 +15,7 @@
 import json
 import os
 
-import mock
+from unittest import mock
 from pyasn1_modules import pem  # type: ignore
 import pytest  # type: ignore
 import rsa  # type: ignore
--- a/tests/oauth2/test__client.py
+++ b/tests/oauth2/test__client.py
@@ -16,7 +16,7 @@ import datetime
 import json
 import os
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 import six
 from six.moves import http_client
--- a/tests/oauth2/test_challenges.py
+++ b/tests/oauth2/test_challenges.py
@@ -17,7 +17,7 @@
 import base64
 import sys
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 import pyu2f  # type: ignore
 
--- a/tests/oauth2/test_credentials.py
+++ b/tests/oauth2/test_credentials.py
@@ -18,7 +18,7 @@ import os
 import pickle
 import sys
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 
 from google.auth import _helpers
--- a/tests/oauth2/test_gdch_credentials.py
+++ b/tests/oauth2/test_gdch_credentials.py
@@ -17,7 +17,7 @@ import datetime
 import json
 import os
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 import requests
 import six
--- a/tests/oauth2/test_id_token.py
+++ b/tests/oauth2/test_id_token.py
@@ -15,7 +15,7 @@
 import json
 import os
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 
 from google.auth import environment_vars
--- a/tests/oauth2/test_reauth.py
+++ b/tests/oauth2/test_reauth.py
@@ -14,7 +14,7 @@
 
 import copy
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 
 from google.auth import exceptions
--- a/tests/oauth2/test_service_account.py
+++ b/tests/oauth2/test_service_account.py
@@ -16,7 +16,7 @@ import datetime
 import json
 import os
 
-import mock
+from unittest import mock
 
 from google.auth import _helpers
 from google.auth import crypt
--- a/tests/oauth2/test_sts.py
+++ b/tests/oauth2/test_sts.py
@@ -14,7 +14,7 @@
 
 import json
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 from six.moves import http_client
 from six.moves import urllib
--- a/tests/test__cloud_sdk.py
+++ b/tests/test__cloud_sdk.py
@@ -17,7 +17,7 @@ import json
 import os
 import subprocess
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 
 from google.auth import _cloud_sdk
--- a/tests/test__default.py
+++ b/tests/test__default.py
@@ -15,7 +15,7 @@
 import json
 import os
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 
 from google.auth import _default
--- a/tests/test__exponential_backoff.py
+++ b/tests/test__exponential_backoff.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import mock
+from unittest import mock
 
 from google.auth import _exponential_backoff
 
--- a/tests/test__oauth2client.py
+++ b/tests/test__oauth2client.py
@@ -16,7 +16,7 @@ import datetime
 import os
 import sys
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 from six.moves import reload_module
 
--- a/tests/test_app_engine.py
+++ b/tests/test_app_engine.py
@@ -14,7 +14,7 @@
 
 import datetime
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 
 from google.auth import app_engine
--- a/tests/test_aws.py
+++ b/tests/test_aws.py
@@ -16,7 +16,7 @@ import datetime
 import json
 import os
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 from six.moves import http_client
 from six.moves import urllib
--- a/tests/test_downscoped.py
+++ b/tests/test_downscoped.py
@@ -15,7 +15,7 @@
 import datetime
 import json
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 from six.moves import http_client
 from six.moves import urllib
--- a/tests/test_external_account.py
+++ b/tests/test_external_account.py
@@ -15,7 +15,7 @@
 import datetime
 import json
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 from six.moves import http_client
 from six.moves import urllib
--- a/tests/test_external_account_authorized_user.py
+++ b/tests/test_external_account_authorized_user.py
@@ -15,7 +15,7 @@
 import datetime
 import json
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 from six.moves import http_client
 
--- a/tests/test_iam.py
+++ b/tests/test_iam.py
@@ -16,7 +16,7 @@ import base64
 import datetime
 import json
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 from six.moves import http_client
 
--- a/tests/test_identity_pool.py
+++ b/tests/test_identity_pool.py
@@ -16,7 +16,7 @@ import datetime
 import json
 import os
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 from six.moves import http_client
 from six.moves import urllib
--- a/tests/test_impersonated_credentials.py
+++ b/tests/test_impersonated_credentials.py
@@ -19,7 +19,7 @@ import os
 # Because Python 2.7
 # from typing import List
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 from six.moves import http_client
 
--- a/tests/test_jwt.py
+++ b/tests/test_jwt.py
@@ -17,7 +17,7 @@ import datetime
 import json
 import os
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 
 from google.auth import _helpers
--- a/tests/test_pluggable.py
+++ b/tests/test_pluggable.py
@@ -17,7 +17,7 @@ import json
 import os
 import subprocess
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 
 # from six.moves import http_client
--- a/tests/transport/test__custom_tls_signer.py
+++ b/tests/transport/test__custom_tls_signer.py
@@ -16,7 +16,7 @@ import base64
 import ctypes
 import os
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 from requests.packages.urllib3.util.ssl_ import create_urllib3_context  # type: ignore
 import urllib3.contrib.pyopenssl  # type: ignore
--- a/tests/transport/test__mtls_helper.py
+++ b/tests/transport/test__mtls_helper.py
@@ -15,7 +15,7 @@
 import os
 import re
 
-import mock
+from unittest import mock
 from OpenSSL import crypto
 import pytest  # type: ignore
 
--- a/tests/transport/test_grpc.py
+++ b/tests/transport/test_grpc.py
@@ -16,7 +16,7 @@ import datetime
 import os
 import time
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 
 from google.auth import _helpers
--- a/tests/transport/test_mtls.py
+++ b/tests/transport/test_mtls.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import mock
+from unittest import mock
 import pytest  # type: ignore
 
 from google.auth import exceptions
--- a/tests/transport/test_requests.py
+++ b/tests/transport/test_requests.py
@@ -18,7 +18,7 @@ import os
 import sys
 
 import freezegun
-import mock
+from unittest import mock
 import OpenSSL
 import pytest  # type: ignore
 import requests
--- a/tests/transport/test_urllib3.py
+++ b/tests/transport/test_urllib3.py
@@ -15,7 +15,7 @@
 import os
 import sys
 
-import mock
+from unittest import mock
 import OpenSSL
 import pytest  # type: ignore
 from six.moves import http_client