diff --git a/kolla_ansible/tests/unit/test_filters.py b/kolla_ansible/tests/unit/test_filters.py
index 8eef4f0e09..2ae334ce37 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 b25acf67d3..a714d26beb 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 7fb9b4f0bc..af00bc89f5 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 8091025d18..ccc7029479 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