diff --git a/test-requirements.txt b/test-requirements.txt
index 7d9c258..2422e28 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -9,7 +9,6 @@
 #
 charm-tools>=2.4.4
 requests>=2.18.4
-mock>=1.2
 flake8>=2.2.4,<=2.4.1
 stestr>=2.2.0
 coverage>=4.5.2
diff --git a/unit_tests/test_actions.py b/unit_tests/test_actions.py
index 6f37c83..d921671 100644
--- a/unit_tests/test_actions.py
+++ b/unit_tests/test_actions.py
@@ -12,8 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import mock
-from mock import patch
+from unittest import mock
+from unittest.mock import patch
 
 from test_utils import CharmTestCase
 
diff --git a/unit_tests/test_ceilometer_hooks.py b/unit_tests/test_ceilometer_hooks.py
index 2be6c51..962f686 100644
--- a/unit_tests/test_ceilometer_hooks.py
+++ b/unit_tests/test_ceilometer_hooks.py
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 import json
-from mock import patch
+from unittest.mock import patch
 
 import ceilometer_utils
 
diff --git a/unit_tests/test_ceilometer_utils.py b/unit_tests/test_ceilometer_utils.py
index afa56b8..5707e07 100644
--- a/unit_tests/test_ceilometer_utils.py
+++ b/unit_tests/test_ceilometer_utils.py
@@ -14,7 +14,7 @@
 
 import sys
 
-from mock import MagicMock, patch
+from unittest.mock import MagicMock, patch
 
 # python-apt is not installed as part of test-requirements but is imported by
 # some charmhelpers modules so create a fake import.
diff --git a/unit_tests/test_utils.py b/unit_tests/test_utils.py
index deb5206..c7dddb4 100644
--- a/unit_tests/test_utils.py
+++ b/unit_tests/test_utils.py
@@ -19,7 +19,7 @@ import yaml
 import io
 
 from contextlib import contextmanager
-from mock import patch
+from unittest.mock import patch
 
 
 @contextmanager