diff --git a/ironic_inspector/test/unit/test_plugins_base_physnet.py b/ironic_inspector/test/unit/test_plugins_base_physnet.py
index b41d0c36b..ceadc14cc 100644
--- a/ironic_inspector/test/unit/test_plugins_base_physnet.py
+++ b/ironic_inspector/test/unit/test_plugins_base_physnet.py
@@ -13,7 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import mock
+from unittest import mock
+
 from oslo_config import cfg
 
 from ironic_inspector import node_cache
diff --git a/ironic_inspector/test/unit/test_plugins_physnet_cidr_map.py b/ironic_inspector/test/unit/test_plugins_physnet_cidr_map.py
index 5c27a00e3..d1b4b7acf 100644
--- a/ironic_inspector/test/unit/test_plugins_physnet_cidr_map.py
+++ b/ironic_inspector/test/unit/test_plugins_physnet_cidr_map.py
@@ -11,7 +11,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import mock
+from unittest import mock
+
 from openstack import exceptions
 from oslo_config import cfg
 
diff --git a/lower-constraints.txt b/lower-constraints.txt
index 804da82c3..808acb92d 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -49,7 +49,6 @@ kombu==4.6.8
 linecache2==1.0.0
 Mako==1.1.2
 MarkupSafe==1.1.1
-mock==3.0.0
 monotonic==1.5
 mox3==1.0.0
 msgpack==1.0.0