diff --git a/lower-constraints.txt b/lower-constraints.txt
index bbbb5cd..032cac6 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -12,7 +12,6 @@ Jinja2==2.10
 linecache2==1.0.0
 MarkupSafe==1.0
 mccabe==0.2.1
-mock==2.0.0
 pbr==2.0.0
 pep8==1.5.7
 pyflakes==0.8.1
diff --git a/os_apply_config/tests/test_apply_config.py b/os_apply_config/tests/test_apply_config.py
index 8e921d4..d70748b 100644
--- a/os_apply_config/tests/test_apply_config.py
+++ b/os_apply_config/tests/test_apply_config.py
@@ -17,9 +17,9 @@ import atexit
 import json
 import os
 import tempfile
+from unittest import mock
 
 import fixtures
-import mock
 import testtools
 
 from os_apply_config import apply_config
diff --git a/test-requirements.txt b/test-requirements.txt
index 1762ace..efdba89 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -5,7 +5,6 @@ hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 
 coverage!=4.4,>=4.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
-mock>=2.0.0 # BSD
 python-subunit>=1.0.0 # Apache-2.0/BSD
 sphinx!=1.6.6,!=1.6.7,>=1.6.5,<2.0.0;python_version=='2.7'  # BSD
 sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.5;python_version>='3.4'  # BSD