diff --git a/ironic_lib/tests/test_basic_auth.py b/ironic_lib/tests/test_basic_auth.py
index ef33717a..d3af1794 100644
--- a/ironic_lib/tests/test_basic_auth.py
+++ b/ironic_lib/tests/test_basic_auth.py
@@ -16,8 +16,7 @@
 import base64
 import os
 import tempfile
-
-import mock
+from unittest import mock
 
 from ironic_lib import auth_basic
 from ironic_lib import exception
diff --git a/lower-constraints.txt b/lower-constraints.txt
index 66fbdbb6..af50a228 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -20,7 +20,6 @@ iso8601==0.1.11
 keystoneauth1==3.4.0
 linecache2==1.0.0
 mccabe==0.2.1
-mock==2.0.0
 monotonic==0.6
 mox3==0.20.0
 msgpack-python==0.4.0