diff --git a/lower-constraints.txt b/lower-constraints.txt
index fdee35c371..7aa3fa9636 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -56,7 +56,6 @@ Mako==1.0.7
 marathon==0.8.6
 MarkupSafe==1.0
 mccabe==0.2.1
-mock==2.0.0
 monotonic==1.4
 mox3==0.25.0
 msgpack==0.5.6
diff --git a/magnum/tests/unit/common/cert_manager/test_barbican.py b/magnum/tests/unit/common/cert_manager/test_barbican.py
index afd22b1a69..e98493b05a 100644
--- a/magnum/tests/unit/common/cert_manager/test_barbican.py
+++ b/magnum/tests/unit/common/cert_manager/test_barbican.py
@@ -18,7 +18,7 @@ import uuid
 from barbicanclient.v1 import client as barbican_client
 from barbicanclient.v1 import containers
 from barbicanclient.v1 import secrets
-from mock import patch
+from unittest.mock import patch
 
 from magnum.common.cert_manager import barbican_cert_manager as bcm
 from magnum.common.cert_manager import cert_manager
diff --git a/magnum/tests/unit/common/test_urlfetch.py b/magnum/tests/unit/common/test_urlfetch.py
index 36d835319c..65d1913463 100644
--- a/magnum/tests/unit/common/test_urlfetch.py
+++ b/magnum/tests/unit/common/test_urlfetch.py
@@ -10,8 +10,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from mock import patch
 from unittest import mock
+from unittest.mock import patch
 
 from oslo_config import cfg
 
diff --git a/magnum/tests/unit/conductor/handlers/common/test_trust_manager.py b/magnum/tests/unit/conductor/handlers/common/test_trust_manager.py
index 2a69ebf9c8..749289fbb2 100644
--- a/magnum/tests/unit/conductor/handlers/common/test_trust_manager.py
+++ b/magnum/tests/unit/conductor/handlers/common/test_trust_manager.py
@@ -12,8 +12,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from mock import patch
 from unittest import mock
+from unittest.mock import patch
 
 from magnum.common import exception
 from magnum.conductor.handlers.common import trust_manager
diff --git a/magnum/tests/unit/conductor/handlers/test_cluster_conductor.py b/magnum/tests/unit/conductor/handlers/test_cluster_conductor.py
index 2573f2743e..a04bf0508c 100644
--- a/magnum/tests/unit/conductor/handlers/test_cluster_conductor.py
+++ b/magnum/tests/unit/conductor/handlers/test_cluster_conductor.py
@@ -15,11 +15,11 @@
 # under the License.
 
 from unittest import mock
+from unittest.mock import patch
 
 import six
 
 from heatclient import exc
-from mock import patch
 from oslo_service import loopingcall
 from pycadf import cadftaxonomy as taxonomy
 
diff --git a/magnum/tests/unit/conductor/handlers/test_k8s_cluster_conductor.py b/magnum/tests/unit/conductor/handlers/test_k8s_cluster_conductor.py
index 5538d68f40..c5ddd2350c 100644
--- a/magnum/tests/unit/conductor/handlers/test_k8s_cluster_conductor.py
+++ b/magnum/tests/unit/conductor/handlers/test_k8s_cluster_conductor.py
@@ -12,8 +12,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from mock import patch
 from unittest import mock
+from unittest.mock import patch
 
 import magnum.conf
 from magnum.drivers.k8s_coreos_v1 import driver as k8s_coreos_dr
diff --git a/magnum/tests/unit/conductor/handlers/test_mesos_cluster_conductor.py b/magnum/tests/unit/conductor/handlers/test_mesos_cluster_conductor.py
index 54eb77da3d..55549faa42 100644
--- a/magnum/tests/unit/conductor/handlers/test_mesos_cluster_conductor.py
+++ b/magnum/tests/unit/conductor/handlers/test_mesos_cluster_conductor.py
@@ -12,8 +12,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from mock import patch
 from unittest import mock
+from unittest.mock import patch
 
 from magnum.drivers.heat import driver as heat_driver
 from magnum.drivers.mesos_ubuntu_v1 import driver as mesos_dr
diff --git a/magnum/tests/unit/conductor/handlers/test_nodegroup_conductor.py b/magnum/tests/unit/conductor/handlers/test_nodegroup_conductor.py
index 41fe395901..fcbaba3670 100644
--- a/magnum/tests/unit/conductor/handlers/test_nodegroup_conductor.py
+++ b/magnum/tests/unit/conductor/handlers/test_nodegroup_conductor.py
@@ -13,8 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from mock import patch
 from unittest import mock
+from unittest.mock import patch
 
 from heatclient import exc
 
diff --git a/magnum/tests/unit/conductor/handlers/test_swarm_cluster_conductor.py b/magnum/tests/unit/conductor/handlers/test_swarm_cluster_conductor.py
index 34608732e0..b057678d28 100644
--- a/magnum/tests/unit/conductor/handlers/test_swarm_cluster_conductor.py
+++ b/magnum/tests/unit/conductor/handlers/test_swarm_cluster_conductor.py
@@ -12,8 +12,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from mock import patch
 from unittest import mock
+from unittest.mock import patch
 
 import magnum.conf
 from magnum.drivers.heat import driver as heat_driver
diff --git a/magnum/tests/unit/conductor/test_utils.py b/magnum/tests/unit/conductor/test_utils.py
index 7483d36eea..f36d930047 100644
--- a/magnum/tests/unit/conductor/test_utils.py
+++ b/magnum/tests/unit/conductor/test_utils.py
@@ -12,8 +12,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from mock import patch
 from unittest import mock
+from unittest.mock import patch
 
 from magnum.conductor import utils
 from magnum import objects
diff --git a/magnum/tests/unit/drivers/test_heat_driver.py b/magnum/tests/unit/drivers/test_heat_driver.py
index ed63e8246b..2e9fc7106d 100644
--- a/magnum/tests/unit/drivers/test_heat_driver.py
+++ b/magnum/tests/unit/drivers/test_heat_driver.py
@@ -10,8 +10,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from mock import patch
 from unittest import mock
+from unittest.mock import patch
 
 from heatclient import exc as heatexc
 from oslo_utils import uuidutils
diff --git a/magnum/tests/unit/drivers/test_k8s_fedora_atomic_v1_driver.py b/magnum/tests/unit/drivers/test_k8s_fedora_atomic_v1_driver.py
index f0e7cb3e21..b0cd0aebf9 100644
--- a/magnum/tests/unit/drivers/test_k8s_fedora_atomic_v1_driver.py
+++ b/magnum/tests/unit/drivers/test_k8s_fedora_atomic_v1_driver.py
@@ -13,7 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from mock import patch
+from unittest.mock import patch
 
 from magnum.common import exception
 from magnum.drivers.k8s_fedora_atomic_v1 import driver