diff -Nru google-cloud-storage-2.13.0.orig/tests/system/test_blob.py google-cloud-storage-2.13.0/tests/system/test_blob.py
--- google-cloud-storage-2.13.0.orig/tests/system/test_blob.py	2023-10-31 18:39:05.000000000 +0100
+++ google-cloud-storage-2.13.0/tests/system/test_blob.py	2023-11-24 14:24:31.800639129 +0100
@@ -21,7 +21,7 @@
 import warnings
 
 import pytest
-import mock
+from unittest import mock
 
 from google import resumable_media
 from google.api_core import exceptions
diff -Nru google-cloud-storage-2.13.0.orig/tests/unit/test_acl.py google-cloud-storage-2.13.0/tests/unit/test_acl.py
--- google-cloud-storage-2.13.0.orig/tests/unit/test_acl.py	2023-10-31 18:39:05.000000000 +0100
+++ google-cloud-storage-2.13.0/tests/unit/test_acl.py	2023-11-24 14:24:31.910639470 +0100
@@ -14,7 +14,7 @@
 
 import unittest
 
-import mock
+from unittest import mock
 
 from google.cloud.storage.retry import (
     DEFAULT_RETRY,
diff -Nru google-cloud-storage-2.13.0.orig/tests/unit/test_batch.py google-cloud-storage-2.13.0/tests/unit/test_batch.py
--- google-cloud-storage-2.13.0.orig/tests/unit/test_batch.py	2023-10-31 18:39:05.000000000 +0100
+++ google-cloud-storage-2.13.0/tests/unit/test_batch.py	2023-11-24 14:24:31.880639377 +0100
@@ -17,7 +17,7 @@
 from http.client import NO_CONTENT
 import unittest
 
-import mock
+from unittest import mock
 import requests
 
 
diff -Nru google-cloud-storage-2.13.0.orig/tests/unit/test_blob.py google-cloud-storage-2.13.0/tests/unit/test_blob.py
--- google-cloud-storage-2.13.0.orig/tests/unit/test_blob.py	2023-10-31 18:39:05.000000000 +0100
+++ google-cloud-storage-2.13.0/tests/unit/test_blob.py	2023-11-24 14:24:31.863972659 +0100
@@ -24,7 +24,7 @@
 from unittest.mock import patch
 from urllib.parse import urlencode
 
-import mock
+from unittest import mock
 import pytest
 
 from google.cloud.storage import _helpers
diff -Nru google-cloud-storage-2.13.0.orig/tests/unit/test_bucket.py google-cloud-storage-2.13.0/tests/unit/test_bucket.py
--- google-cloud-storage-2.13.0.orig/tests/unit/test_bucket.py	2023-10-31 18:39:05.000000000 +0100
+++ google-cloud-storage-2.13.0/tests/unit/test_bucket.py	2023-11-24 14:24:31.903972782 +0100
@@ -15,7 +15,7 @@
 import datetime
 import unittest
 
-import mock
+from unittest import mock
 import pytest
 
 from google.cloud.storage.retry import DEFAULT_RETRY
diff -Nru google-cloud-storage-2.13.0.orig/tests/unit/test_client.py google-cloud-storage-2.13.0/tests/unit/test_client.py
--- google-cloud-storage-2.13.0.orig/tests/unit/test_client.py	2023-10-31 18:39:05.000000000 +0100
+++ google-cloud-storage-2.13.0/tests/unit/test_client.py	2023-11-24 14:24:31.877306033 +0100
@@ -17,7 +17,7 @@
 import io
 import json
 from unittest.mock import patch
-import mock
+from unittest import mock
 import pytest
 import re
 import requests
diff -Nru google-cloud-storage-2.13.0.orig/tests/unit/test_fileio.py google-cloud-storage-2.13.0/tests/unit/test_fileio.py
--- google-cloud-storage-2.13.0.orig/tests/unit/test_fileio.py	2023-10-31 18:39:05.000000000 +0100
+++ google-cloud-storage-2.13.0/tests/unit/test_fileio.py	2023-11-24 14:24:31.873972690 +0100
@@ -18,7 +18,7 @@
 import io
 import string
 
-import mock
+from unittest import mock
 
 from google.api_core.exceptions import RequestRangeNotSatisfiable
 from google.cloud.storage.retry import DEFAULT_RETRY
diff -Nru google-cloud-storage-2.13.0.orig/tests/unit/test__helpers.py google-cloud-storage-2.13.0/tests/unit/test__helpers.py
--- google-cloud-storage-2.13.0.orig/tests/unit/test__helpers.py	2023-10-31 18:39:05.000000000 +0100
+++ google-cloud-storage-2.13.0/tests/unit/test__helpers.py	2023-11-24 14:24:31.870639346 +0100
@@ -14,7 +14,7 @@
 
 import unittest
 
-import mock
+from unittest import mock
 
 from google.cloud.storage.retry import DEFAULT_RETRY
 from google.cloud.storage.retry import DEFAULT_RETRY_IF_METAGENERATION_SPECIFIED
diff -Nru google-cloud-storage-2.13.0.orig/tests/unit/test_hmac_key.py google-cloud-storage-2.13.0/tests/unit/test_hmac_key.py
--- google-cloud-storage-2.13.0.orig/tests/unit/test_hmac_key.py	2023-10-31 18:39:05.000000000 +0100
+++ google-cloud-storage-2.13.0/tests/unit/test_hmac_key.py	2023-11-24 14:24:31.897306095 +0100
@@ -14,7 +14,7 @@
 
 import unittest
 
-import mock
+from unittest import mock
 
 from google.cloud.storage.retry import DEFAULT_RETRY
 from google.cloud.storage.retry import DEFAULT_RETRY_IF_ETAG_IN_JSON
diff -Nru google-cloud-storage-2.13.0.orig/tests/unit/test__http.py google-cloud-storage-2.13.0/tests/unit/test__http.py
--- google-cloud-storage-2.13.0.orig/tests/unit/test__http.py	2023-10-31 18:39:05.000000000 +0100
+++ google-cloud-storage-2.13.0/tests/unit/test__http.py	2023-11-24 14:24:31.853972628 +0100
@@ -15,7 +15,7 @@
 import unittest
 from unittest.mock import patch
 
-import mock
+from unittest import mock
 
 from google.cloud.storage import _helpers
 
diff -Nru google-cloud-storage-2.13.0.orig/tests/unit/test_notification.py google-cloud-storage-2.13.0/tests/unit/test_notification.py
--- google-cloud-storage-2.13.0.orig/tests/unit/test_notification.py	2023-10-31 18:39:05.000000000 +0100
+++ google-cloud-storage-2.13.0/tests/unit/test_notification.py	2023-11-24 14:24:31.857305971 +0100
@@ -14,7 +14,7 @@
 
 import unittest
 
-import mock
+from unittest import mock
 
 from google.cloud.storage.retry import DEFAULT_RETRY
 
diff -Nru google-cloud-storage-2.13.0.orig/tests/unit/test_retry.py google-cloud-storage-2.13.0/tests/unit/test_retry.py
--- google-cloud-storage-2.13.0.orig/tests/unit/test_retry.py	2023-10-31 18:39:05.000000000 +0100
+++ google-cloud-storage-2.13.0/tests/unit/test_retry.py	2023-11-24 14:24:31.890639408 +0100
@@ -16,7 +16,7 @@
 
 from google.cloud.storage import _helpers
 
-import mock
+from unittest import mock
 
 
 class Test_should_retry(unittest.TestCase):
diff -Nru google-cloud-storage-2.13.0.orig/tests/unit/test__signing.py google-cloud-storage-2.13.0/tests/unit/test__signing.py
--- google-cloud-storage-2.13.0.orig/tests/unit/test__signing.py	2023-10-31 18:39:05.000000000 +0100
+++ google-cloud-storage-2.13.0/tests/unit/test__signing.py	2023-11-24 14:24:31.867306002 +0100
@@ -23,7 +23,7 @@
 import unittest
 import urllib.parse
 
-import mock
+from unittest import mock
 import pytest
 
 from . import _read_local_json
diff -Nru google-cloud-storage-2.13.0.orig/tests/unit/test_transfer_manager.py google-cloud-storage-2.13.0/tests/unit/test_transfer_manager.py
--- google-cloud-storage-2.13.0.orig/tests/unit/test_transfer_manager.py	2023-10-31 18:39:05.000000000 +0100
+++ google-cloud-storage-2.13.0/tests/unit/test_transfer_manager.py	2023-11-24 14:24:31.883972721 +0100
@@ -24,7 +24,7 @@
 
 import os
 import tempfile
-import mock
+from unittest import mock
 import pickle
 
 BLOB_TOKEN_STRING = "blob token"