diff --git a/lower-constraints.txt b/lower-constraints.txt
index 62bdd2e..bf16b6d 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -19,7 +19,6 @@ keystoneauth1==3.4.0
 linecache2==1.0.0
 MarkupSafe==1.0
 mccabe==0.2.1
-mock==2.0.0
 mox3==0.20.0
 msgpack==0.6.0
 netaddr==0.7.18
diff --git a/oslo_privsep/tests/test_capabilities.py b/oslo_privsep/tests/test_capabilities.py
index af9ae14..725ea24 100644
--- a/oslo_privsep/tests/test_capabilities.py
+++ b/oslo_privsep/tests/test_capabilities.py
@@ -12,7 +12,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
 
 from oslotest import base
 
diff --git a/oslo_privsep/tests/test_daemon.py b/oslo_privsep/tests/test_daemon.py
index c2b3efd..f3f3ffe 100644
--- a/oslo_privsep/tests/test_daemon.py
+++ b/oslo_privsep/tests/test_daemon.py
@@ -16,10 +16,10 @@ import copy
 import fixtures
 import functools
 import logging as pylogging
-import mock
 import platform
 import sys
 import time
+from unittest import mock
 
 from oslo_log import formatters
 from oslo_log import log as logging
diff --git a/oslo_privsep/tests/test_priv_context.py b/oslo_privsep/tests/test_priv_context.py
index d02f78e..d6480db 100644
--- a/oslo_privsep/tests/test_priv_context.py
+++ b/oslo_privsep/tests/test_priv_context.py
@@ -19,8 +19,8 @@ import pipes
 import platform
 import sys
 import tempfile
+from unittest import mock
 
-import mock
 import testtools
 
 from oslo_privsep import daemon
diff --git a/test-requirements.txt b/test-requirements.txt
index 6d79b2b..ba4b3d1 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -4,7 +4,6 @@
 
 hacking>=3.0,<3.1.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
-mock>=2.0.0 # BSD
 fixtures>=3.0.0 # Apache-2.0/BSD
 stestr>=2.0.0 # Apache-2.0