diff --git a/monasca_common/tests/policy/test_policy.py b/monasca_common/tests/policy/test_policy.py
index 50981af6..a9ffae14 100644
--- a/monasca_common/tests/policy/test_policy.py
+++ b/monasca_common/tests/policy/test_policy.py
@@ -14,8 +14,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
 import requests_mock
+from unittest import mock
 
 from oslo_context import context
 from oslo_policy import policy as os_policy
diff --git a/monasca_common/tests/test_confluent_kafka.py b/monasca_common/tests/test_confluent_kafka.py
index b23dd539..9668cb3f 100644
--- a/monasca_common/tests/test_confluent_kafka.py
+++ b/monasca_common/tests/test_confluent_kafka.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import mock
+from unittest import mock
 
 from monasca_common.confluent_kafka import consumer
 from monasca_common.confluent_kafka import producer
diff --git a/monasca_common/tests/test_kafka.py b/monasca_common/tests/test_kafka.py
index 73dcad4d..02444842 100644
--- a/monasca_common/tests/test_kafka.py
+++ b/monasca_common/tests/test_kafka.py
@@ -10,7 +10,7 @@
 # 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/monasca_common/tests/test_repositories.py b/monasca_common/tests/test_repositories.py
index dcf189d8..1fa95426 100644
--- a/monasca_common/tests/test_repositories.py
+++ b/monasca_common/tests/test_repositories.py
@@ -10,7 +10,7 @@
 #   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/monasca_common/tests/test_rest.py b/monasca_common/tests/test_rest.py
index d901f05e..36982520 100644
--- a/monasca_common/tests/test_rest.py
+++ b/monasca_common/tests/test_rest.py
@@ -10,7 +10,7 @@
 # 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/test-requirements.txt b/test-requirements.txt
index a74545d1..bcce3dba 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -8,7 +8,6 @@ Babel!=2.4.0,>=2.3.4 # BSD
 coverage!=4.4,>=4.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
 httplib2>=0.9.1 # MIT
-mock>=2.0.0 # BSD
 oslo.context>=2.19.2 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 stestr>=1.0.0 # Apache-2.0