diff -Nru google_cloud_storage-3.1.0.orig/tests/system/test_blob.py google_cloud_storage-3.1.0/tests/system/test_blob.py
--- google_cloud_storage-3.1.0.orig/tests/system/test_blob.py	2025-02-28 01:15:44.000000000 +0100
+++ google_cloud_storage-3.1.0/tests/system/test_blob.py	2025-04-26 11:42:46.622992898 +0200
@@ -21,7 +21,7 @@
 import warnings
 
 import pytest
-import mock
+from unittest import mock
 
 from google.cloud.storage.exceptions import DataCorruption
 from google.api_core import exceptions
diff -Nru google_cloud_storage-3.1.0.orig/tests/unit/test_acl.py google_cloud_storage-3.1.0/tests/unit/test_acl.py
--- google_cloud_storage-3.1.0.orig/tests/unit/test_acl.py	2025-02-28 01:15:44.000000000 +0100
+++ google_cloud_storage-3.1.0/tests/unit/test_acl.py	2025-04-26 11:42:46.624599658 +0200
@@ -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-3.1.0.orig/tests/unit/test_batch.py google_cloud_storage-3.1.0/tests/unit/test_batch.py
--- google_cloud_storage-3.1.0.orig/tests/unit/test_batch.py	2025-02-28 01:15:44.000000000 +0100
+++ google_cloud_storage-3.1.0/tests/unit/test_batch.py	2025-04-26 11:42:46.624902162 +0200
@@ -17,7 +17,7 @@
 from http.client import NO_CONTENT
 import unittest
 
-import mock
+from unittest import mock
 import requests
 
 from google.cloud.storage._helpers import _DEFAULT_UNIVERSE_DOMAIN
diff -Nru google_cloud_storage-3.1.0.orig/tests/unit/test_blob.py google_cloud_storage-3.1.0/tests/unit/test_blob.py
--- google_cloud_storage-3.1.0.orig/tests/unit/test_blob.py	2025-02-28 01:15:44.000000000 +0100
+++ google_cloud_storage-3.1.0/tests/unit/test_blob.py	2025-04-26 11:42:46.625931927 +0200
@@ -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.exceptions import NotFound
diff -Nru google_cloud_storage-3.1.0.orig/tests/unit/test_bucket.py google_cloud_storage-3.1.0/tests/unit/test_bucket.py
--- google_cloud_storage-3.1.0.orig/tests/unit/test_bucket.py	2025-02-28 01:15:44.000000000 +0100
+++ google_cloud_storage-3.1.0/tests/unit/test_bucket.py	2025-04-26 11:42:46.626866799 +0200
@@ -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-3.1.0.orig/tests/unit/test_client.py google_cloud_storage-3.1.0/tests/unit/test_client.py
--- google_cloud_storage-3.1.0.orig/tests/unit/test_client.py	2025-02-28 01:15:44.000000000 +0100
+++ google_cloud_storage-3.1.0/tests/unit/test_client.py	2025-04-26 11:42:46.627866820 +0200
@@ -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-3.1.0.orig/tests/unit/test_fileio.py google_cloud_storage-3.1.0/tests/unit/test_fileio.py
--- google_cloud_storage-3.1.0.orig/tests/unit/test_fileio.py	2025-02-28 01:15:44.000000000 +0100
+++ google_cloud_storage-3.1.0/tests/unit/test_fileio.py	2025-04-26 11:42:46.628946480 +0200
@@ -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.fileio import CHUNK_SIZE_MULTIPLE
diff -Nru google_cloud_storage-3.1.0.orig/tests/unit/test__helpers.py google_cloud_storage-3.1.0/tests/unit/test__helpers.py
--- google_cloud_storage-3.1.0.orig/tests/unit/test__helpers.py	2025-02-28 01:15:44.000000000 +0100
+++ google_cloud_storage-3.1.0/tests/unit/test__helpers.py	2025-04-26 11:42:46.623466116 +0200
@@ -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
@@ -586,8 +586,6 @@
         self.assertEqual(SIGNED_CONTENT, b"kBiQqOnIz21aGlQrIp/r/w==")
 
     def test_it_with_stubs(self):
-        import mock
-
         class _Buffer(object):
             def __init__(self, return_vals):
                 self.return_vals = return_vals
diff -Nru google_cloud_storage-3.1.0.orig/tests/unit/test_hmac_key.py google_cloud_storage-3.1.0/tests/unit/test_hmac_key.py
--- google_cloud_storage-3.1.0.orig/tests/unit/test_hmac_key.py	2025-02-28 01:15:44.000000000 +0100
+++ google_cloud_storage-3.1.0/tests/unit/test_hmac_key.py	2025-04-26 11:42:46.629270565 +0200
@@ -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-3.1.0.orig/tests/unit/test__http.py google_cloud_storage-3.1.0/tests/unit/test__http.py
--- google_cloud_storage-3.1.0.orig/tests/unit/test__http.py	2025-02-28 01:15:44.000000000 +0100
+++ google_cloud_storage-3.1.0/tests/unit/test__http.py	2025-04-26 11:42:46.623791083 +0200
@@ -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-3.1.0.orig/tests/unit/test_notification.py google_cloud_storage-3.1.0/tests/unit/test_notification.py
--- google_cloud_storage-3.1.0.orig/tests/unit/test_notification.py	2025-02-28 01:15:44.000000000 +0100
+++ google_cloud_storage-3.1.0/tests/unit/test_notification.py	2025-04-26 11:42:46.629520038 +0200
@@ -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-3.1.0.orig/tests/unit/test__opentelemetry_tracing.py google_cloud_storage-3.1.0/tests/unit/test__opentelemetry_tracing.py
--- google_cloud_storage-3.1.0.orig/tests/unit/test__opentelemetry_tracing.py	2025-02-28 01:15:44.000000000 +0100
+++ google_cloud_storage-3.1.0/tests/unit/test__opentelemetry_tracing.py	2025-04-26 11:42:46.624011662 +0200
@@ -17,7 +17,7 @@
 import pytest
 import sys
 
-import mock
+from unittest import mock
 from google.api_core.exceptions import GoogleAPICallError
 from google.cloud.storage import __version__
 from google.cloud.storage import _opentelemetry_tracing
diff -Nru google_cloud_storage-3.1.0.orig/tests/unit/test_retry.py google_cloud_storage-3.1.0/tests/unit/test_retry.py
--- google_cloud_storage-3.1.0.orig/tests/unit/test_retry.py	2025-02-28 01:15:44.000000000 +0100
+++ google_cloud_storage-3.1.0/tests/unit/test_retry.py	2025-04-26 11:42:46.629783609 +0200
@@ -17,7 +17,7 @@
 from google.cloud.storage import _helpers
 from google.cloud.storage.exceptions import InvalidResponse
 
-import mock
+from unittest import mock
 
 
 class Test_should_retry(unittest.TestCase):
diff -Nru google_cloud_storage-3.1.0.orig/tests/unit/test__signing.py google_cloud_storage-3.1.0/tests/unit/test__signing.py
--- google_cloud_storage-3.1.0.orig/tests/unit/test__signing.py	2025-02-28 01:15:44.000000000 +0100
+++ google_cloud_storage-3.1.0/tests/unit/test__signing.py	2025-04-26 11:42:46.624285442 +0200
@@ -23,7 +23,7 @@
 import unittest
 import urllib.parse
 
-import mock
+from unittest import mock
 import pytest
 
 from google.cloud.storage._helpers import _UTC
diff -Nru google_cloud_storage-3.1.0.orig/tests/unit/test_transfer_manager.py google_cloud_storage-3.1.0/tests/unit/test_transfer_manager.py
--- google_cloud_storage-3.1.0.orig/tests/unit/test_transfer_manager.py	2025-02-28 01:15:44.000000000 +0100
+++ google_cloud_storage-3.1.0/tests/unit/test_transfer_manager.py	2025-04-26 11:42:46.629866863 +0200
@@ -25,7 +25,7 @@
 
 import os
 import tempfile
-import mock
+from unittest import mock
 import pickle
 
 BLOB_TOKEN_STRING = "blob token"