diff --git a/lower-constraints.txt b/lower-constraints.txt
index 3d4b864..9a397d2 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -19,7 +19,6 @@ keystoneauth1==3.4.0
 linecache2==1.0.0
 MarkupSafe==1.0
 mccabe==0.2.1
-mock==2.0.0
 mox3==0.20.0
 openstackdocstheme==1.20.0
 os-client-config==1.28.0
diff --git a/oslo_rootwrap/tests/test_functional.py b/oslo_rootwrap/tests/test_functional.py
index 83e76d4..da59b21 100644
--- a/oslo_rootwrap/tests/test_functional.py
+++ b/oslo_rootwrap/tests/test_functional.py
@@ -23,6 +23,7 @@ import signal
 import sys
 import threading
 import time
+from unittest import mock
 
 try:
     import eventlet
@@ -30,7 +31,6 @@ except ImportError:
     eventlet = None
 
 import fixtures
-import mock
 import six
 import testtools
 from testtools import content
diff --git a/oslo_rootwrap/tests/test_rootwrap.py b/oslo_rootwrap/tests/test_rootwrap.py
index ad923a5..112843e 100644
--- a/oslo_rootwrap/tests/test_rootwrap.py
+++ b/oslo_rootwrap/tests/test_rootwrap.py
@@ -16,10 +16,10 @@ import logging
 import logging.handlers
 import os
 import tempfile
+from unittest import mock
 import uuid
 
 import fixtures
-import mock
 from six import moves
 import testtools
 
diff --git a/test-requirements.txt b/test-requirements.txt
index 02e4738..3f5ae04 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -11,10 +11,6 @@ stestr>=2.0.0 # Apache-2.0
 # this is required for the docs build jobs
 oslotest>=3.2.0 # Apache-2.0
 
-
-# mocking framework
-mock>=2.0.0 # BSD
-
 # rootwrap daemon's client should be verified to run in eventlet
 eventlet!=0.18.3,!=0.20.1,>=0.18.2 # MIT