diff --git a/git_review/tests/test_unit.py b/git_review/tests/test_unit.py
index 7dc0c0ec..1bbdbffc 100644
--- a/git_review/tests/test_unit.py
+++ b/git_review/tests/test_unit.py
@@ -21,9 +21,9 @@ import io
 import os
 import sys
 import textwrap
+from unittest import mock
 
 import fixtures
-import mock
 import testtools
 
 from git_review import cmd
diff --git a/test-requirements.txt b/test-requirements.txt
index c1755118..c61b89b4 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,7 +3,6 @@
 # due to non SNI TLS connections being disabled.
 pbr ; python_version >= "3" and python_version <= "3.5"
 hacking>=2.0.0,<2.1.0
-mock
 fixtures>=0.3.14
 stestr>=2.2.0,<3.0.0
 testtools>=0.9.34