diff --git a/lower-constraints.txt b/lower-constraints.txt
index cd0dde28..f69b80c1 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -22,7 +22,6 @@ keystoneauth1==3.4.0
 linecache2==1.0.0
 MarkupSafe==1.0
 mccabe==0.2.1
-mock==2.0.0
 monotonic==1.4
 mox3==0.25.0
 msgpack==0.5.6
diff --git a/oslo_cache/tests/test_cache.py b/oslo_cache/tests/test_cache.py
index 333fbb65..353cc64d 100644
--- a/oslo_cache/tests/test_cache.py
+++ b/oslo_cache/tests/test_cache.py
@@ -15,9 +15,9 @@
 
 import copy
 import time
+from unittest import mock
 
 from dogpile.cache import proxy
-import mock
 from oslo_config import cfg
 from oslo_config import fixture as config_fixture
 from oslo_utils import uuidutils
diff --git a/oslo_cache/tests/test_connection_pool.py b/oslo_cache/tests/test_connection_pool.py
index 1351937e..b6c073aa 100644
--- a/oslo_cache/tests/test_connection_pool.py
+++ b/oslo_cache/tests/test_connection_pool.py
@@ -12,8 +12,8 @@
 
 import threading
 import time
+from unittest import mock
 
-import mock
 import six
 from six.moves import queue
 import testtools
diff --git a/test-requirements.txt b/test-requirements.txt
index e44e920e..fedd3dbd 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,7 +2,6 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 hacking>=3.0,<3.1.0 # Apache-2.0
-mock>=2.0.0 # BSD
 oslotest>=3.2.0 # Apache-2.0
 pifpaf>=0.10.0 # Apache-2.0
 # Bandit security code scanner