diff --git a/test-requirements.txt b/test-requirements.txt
index b02bc41..076fdc7 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -9,4 +9,3 @@ oslotest>=3.3.0 # Apache-2.0
 testrepository>=0.0.18 # Apache-2.0/BSD
 testscenarios>=0.5.0 # Apache-2.0/BSD
 testtools>=2.3.0 # MIT
-mock>=2.0.0 # BSD
diff --git a/vitrageclient/tests/cli/test_event_post.py b/vitrageclient/tests/cli/test_event_post.py
index 35d629e..8bae9b8 100644
--- a/vitrageclient/tests/cli/test_event_post.py
+++ b/vitrageclient/tests/cli/test_event_post.py
@@ -14,10 +14,10 @@
 
 from argparse import ArgumentParser
 from argparse import ArgumentTypeError
+from unittest import mock
 
 # noinspection PyPackageRequirements
 from datetime import datetime
-import mock
 from testtools import ExpectedException
 
 from vitrageclient.tests.cli.base import CliTestCase
diff --git a/vitrageclient/tests/cli/test_topology_show.py b/vitrageclient/tests/cli/test_topology_show.py
index c74a877..1b9cb52 100644
--- a/vitrageclient/tests/cli/test_topology_show.py
+++ b/vitrageclient/tests/cli/test_topology_show.py
@@ -13,11 +13,11 @@
 # under the License.
 from argparse import ArgumentParser
 from argparse import ArgumentTypeError
+from unittest import mock
 
 import json
 
 # noinspection PyPackageRequirements
-import mock
 # noinspection PyPackageRequirements
 import six
 from testtools import ExpectedException
diff --git a/vitrageclient/tests/test_template.py b/vitrageclient/tests/test_template.py
index 69fb4fb..936c568 100644
--- a/vitrageclient/tests/test_template.py
+++ b/vitrageclient/tests/test_template.py
@@ -12,7 +12,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import mock
+from unittest import mock
+
 from oslotest import base
 
 from vitrageclient import exceptions as exc