diff --git a/kolla_ansible/tests/unit/test_filters.py b/kolla_ansible/tests/unit/test_filters.py
index 8eef4f0e094b2250770214eb12e18626b04e44f7..2ae334ce37fc061dbb628461e16d829d2d82d9fe 100644
--- a/kolla_ansible/tests/unit/test_filters.py
+++ b/kolla_ansible/tests/unit/test_filters.py
@@ -13,9 +13,9 @@
 # under the License.
 
 import unittest
+from unittest import mock
 
 import jinja2
-import mock
 
 from kolla_ansible import exception
 from kolla_ansible import filters
diff --git a/lower-constraints.txt b/lower-constraints.txt
index b25acf67d3ee64ba4383424b8462a8b484a38b42..a714d26beba50a17adcf5cb403648c540e4e7f28 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -39,7 +39,6 @@ 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/tests/test_kolla_docker.py b/tests/test_kolla_docker.py
index 7fb9b4f0bc178a14f997096402e7ab3d4a64b19e..af00bc89f5d895cee6fb0cedf39ab8c1a42a5844 100644
--- a/tests/test_kolla_docker.py
+++ b/tests/test_kolla_docker.py
@@ -19,11 +19,8 @@ import copy
 import imp
 import os
 import sys
+from unittest import mock
 
-try:
-    from unittest import mock
-except ImportError:
-    import mock
 from docker import errors as docker_error
 from docker.types import Ulimit
 from oslotest import base
diff --git a/tests/test_merge_config.py b/tests/test_merge_config.py
index 8091025d183c1860f42538766194d925feac4c8d..ccc70294792c332bc7e7ae7d0a160668e6f075e0 100644
--- a/tests/test_merge_config.py
+++ b/tests/test_merge_config.py
@@ -16,9 +16,9 @@
 import imp
 import os
 import sys
+from unittest import mock
 
 from io import StringIO
-import mock
 from oslotest import base