diff --git a/.github/scripts/requirements.txt b/.github/scripts/requirements.txt
index d0344221..ba870464 100644
--- a/.github/scripts/requirements.txt
+++ b/.github/scripts/requirements.txt
@@ -7,4 +7,3 @@ pytest-runner <7.0.0
 termcolor <2.5.0
 hypothesis <6.101.0
 levenshtein <=0.25.1
-mock <6.0.0
diff --git a/fire/core_test.py b/fire/core_test.py
index 9e1f7dba..90b7f466 100644
--- a/fire/core_test.py
+++ b/fire/core_test.py
@@ -14,11 +14,12 @@
 
 """Tests for the core module."""
 
+from unittest import mock
+
 from fire import core
 from fire import test_components as tc
 from fire import testutils
 from fire import trace
-import mock
 
 
 class CoreTest(testutils.BaseTestCase):
diff --git a/fire/fire_import_test.py b/fire/fire_import_test.py
index c5975681..a6b4acc3 100644
--- a/fire/fire_import_test.py
+++ b/fire/fire_import_test.py
@@ -15,10 +15,10 @@
 """Tests importing the fire module."""
 
 import sys
+from unittest import mock
 
 import fire
 from fire import testutils
-import mock
 
 
 class FireImportTest(testutils.BaseTestCase):
diff --git a/fire/fire_test.py b/fire/fire_test.py
index 74f1f6e6..99b4a7c6 100644
--- a/fire/fire_test.py
+++ b/fire/fire_test.py
@@ -16,13 +16,12 @@
 
 import os
 import sys
+from unittest import mock
 
 import fire
 from fire import test_components as tc
 from fire import testutils
 
-import mock
-
 
 class FireTest(testutils.BaseTestCase):
 
diff --git a/fire/interact_test.py b/fire/interact_test.py
index 99cde285..2f286824 100644
--- a/fire/interact_test.py
+++ b/fire/interact_test.py
@@ -14,11 +14,11 @@
 
 """Tests for the interact module."""
 
+from unittest import mock
+
 from fire import interact
 from fire import testutils
 
-import mock
-
 
 try:
   import IPython  # pylint: disable=unused-import, g-import-not-at-top
diff --git a/fire/testutils.py b/fire/testutils.py
index fa1ca86d..816551b5 100644
--- a/fire/testutils.py
+++ b/fire/testutils.py
@@ -20,12 +20,11 @@
 import re
 import sys
 import unittest
+from unittest import mock
 
 from fire import core
 from fire import trace
 
-import mock
-
 
 class BaseTestCase(unittest.TestCase):
   """Shared test case for Python Fire tests."""
diff --git a/setup.py b/setup.py
index 6adbef46..53f3381a 100644
--- a/setup.py
+++ b/setup.py
@@ -35,7 +35,6 @@
 
 TEST_DEPENDENCIES = [
     'hypothesis',
-    'mock',
     'levenshtein',
 ]