diff --git a/refstack_client/tests/unit/test_client.py b/refstack_client/tests/unit/test_client.py
index 7ab4510..c38384e 100755
--- a/refstack_client/tests/unit/test_client.py
+++ b/refstack_client/tests/unit/test_client.py
@@ -21,8 +21,8 @@ import os
 import tempfile
 
 import httmock
-import mock
-from mock import MagicMock
+from unittest import mock
+from unittest.mock import MagicMock
 import unittest
 
 from refstack_client import refstack_client as rc
diff --git a/refstack_client/tests/unit/test_list_parser.py b/refstack_client/tests/unit/test_list_parser.py
index 7e20962..6d2ba8d 100644
--- a/refstack_client/tests/unit/test_list_parser.py
+++ b/refstack_client/tests/unit/test_list_parser.py
@@ -20,7 +20,7 @@ import subprocess
 import tempfile
 
 import httmock
-import mock
+from unittest import mock
 import unittest
 
 import refstack_client.list_parser as parser
diff --git a/test-requirements.txt b/test-requirements.txt
index 39b4325..875d094 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -4,6 +4,5 @@ flake8<3.8.0
 docutils>=0.11  # OSI-Approved Open Source, Public Domain
 stestr>=1.1.0 # Apache-2.0
 testtools>=0.9.34
-mock
 coverage
 httmock