diff --git a/lower-constraints.txt b/lower-constraints.txt
index b6c825c..68fa740 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -2,7 +2,6 @@ bandit==1.4.0
 coverage==4.0
 doc8==0.6.0
 hacking==0.12.0
-mock==2.0.0
 oslo.i18n==3.15.3
 oslo.serialization==2.28.1
 oslo.utils==3.33.0
diff --git a/octavia_lib/tests/unit/api/drivers/test_driver_lib.py b/octavia_lib/tests/unit/api/drivers/test_driver_lib.py
index fbaad3a..1afdc9b 100644
--- a/octavia_lib/tests/unit/api/drivers/test_driver_lib.py
+++ b/octavia_lib/tests/unit/api/drivers/test_driver_lib.py
@@ -11,8 +11,7 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
-
-import mock
+from unittest import mock
 
 from octavia_lib.api.drivers import driver_lib
 from octavia_lib.api.drivers import exceptions as driver_exceptions
diff --git a/octavia_lib/tests/unit/base.py b/octavia_lib/tests/unit/base.py
index bfaf504..13204a1 100644
--- a/octavia_lib/tests/unit/base.py
+++ b/octavia_lib/tests/unit/base.py
@@ -14,8 +14,7 @@
 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 # 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/test-requirements.txt b/test-requirements.txt
index 56a501c..3ca6033 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -7,7 +7,6 @@ hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 bandit>=1.1.0 # Apache-2.0
 coverage>=4.0,!=4.4 # Apache-2.0
 doc8>=0.6.0 # Apache-2.0
-mock>=2.0.0 # BSD
 pylint==1.9.2 # GPLv2
 python-subunit>=1.0.0 # Apache-2.0/BSD
 oslo.utils>=3.33.0 # Apache-2.0