diff -ur transaction-3.1.0/setup.py transaction-3.1.0.sal/setup.py
--- transaction-3.1.0/setup.py	2023-03-17 10:06:08.000000000 +0100
+++ transaction-3.1.0.sal/setup.py	2023-03-20 07:41:39.527382787 +0100
@@ -28,7 +28,7 @@
 
 README = _read_file('README.rst') + '\n\n' + _read_file('CHANGES.rst')
 
-tests_require = ['mock']
+tests_require = ['unittest.mock']
 
 setup(name='transaction',
       version=version,
diff -ur transaction-3.1.0/src/transaction/tests/test__manager.py transaction-3.1.0.sal/src/transaction/tests/test__manager.py
--- transaction-3.1.0/src/transaction/tests/test__manager.py	2023-03-17 10:06:08.000000000 +0100
+++ transaction-3.1.0.sal/src/transaction/tests/test__manager.py	2023-03-20 07:42:34.198985623 +0100
@@ -13,7 +13,7 @@
 ##############################################################################
 import unittest
 
-import mock
+from unittest import mock
 import zope.interface.verify
 
 from .. import interfaces
@@ -671,7 +671,7 @@
         # If a datamanager registers for synchonization after a
         # transaction has started, we should call newTransaction so it
         # can do necessry setup.
-        import mock
+        from unittest import mock
 
         from .. import TransactionManager
         manager = TransactionManager()
diff -ur transaction-3.1.0/src/transaction.egg-info/requires.txt transaction-3.1.0.sal/src/transaction.egg-info/requires.txt
--- transaction-3.1.0/src/transaction.egg-info/requires.txt	2023-03-17 10:06:08.000000000 +0100
+++ transaction-3.1.0.sal/src/transaction.egg-info/requires.txt	2023-03-20 07:42:05.832710542 +0100
@@ -5,9 +5,9 @@
 repoze.sphinx.autointerface
 
 [test]
-mock
+unittest.mock
 
 [testing]
 nose
 coverage
-mock
+unittest.mock