diff --git a/minimum-constraints.txt b/minimum-constraints.txt

index 570295ab..e771637b 100644

--- a/minimum-constraints.txt

+++ b/minimum-constraints.txt

@@ -92,7 +92,6 @@ wheel==0.33.5; python_version >= '3.8'

 # Direct dependencies for install (must be consistent with requirements.txt)

 M2Crypto==0.31.0

-mock==2.0.0

 ordereddict==1.1

 ply==3.10

 PyYAML==3.11; python_version == '2.6'

diff --git a/pywbem_mock/_wbemconnection_mock.py b/pywbem_mock/_wbemconnection_mock.py

index aa27b305..3eedb330 100644

--- a/pywbem_mock/_wbemconnection_mock.py

+++ b/pywbem_mock/_wbemconnection_mock.py

@@ -40,7 +40,7 @@ try:

     from collections import Counter

 except ImportError:

     from backport_collections import Counter

-from mock import Mock

+from unittest.mock import Mock

 import six

 # pylint: disable=ungrouped-imports

diff --git a/requirements.txt b/requirements.txt

index 3ac782d5..1e5cd238 100644

--- a/requirements.txt

+++ b/requirements.txt

@@ -11,9 +11,6 @@

 # On Windows, M2Crypto must be installed via pywbem_os_setup.bat

 M2Crypto>=0.31.0; python_version < '3.0' and sys_platform != 'win32'

-mock>=2.0.0,<3.0.0; python_version == '2.6'

-mock>=2.0.0,<4.0.0; python_version >= '2.7' and python_version <= '3.5'

-mock>=2.0.0; python_version >= '3.6'

 ordereddict>=1.1; python_version == '2.6'

 ply>=3.10

 # PyYAML 5.3 has removed support for Python 3.4; fixes narrow build error

diff --git a/tests/unittest/pywbem/test_cim_obj.py b/tests/unittest/pywbem/test_cim_obj.py

index 2f6b89d2..d3f8a9aa 100755

--- a/tests/unittest/pywbem/test_cim_obj.py

+++ b/tests/unittest/pywbem/test_cim_obj.py

@@ -9,7 +9,7 @@ from __future__ import absolute_import, print_function

 import sys

 import re

 from datetime import timedelta, datetime

-from mock import patch

+from unittest.mock import patch

 try:

     from collections import OrderedDict

 except ImportError:

diff --git a/tests/unittest/pywbem/test_itermethods.py b/tests/unittest/pywbem/test_itermethods.py

index f7d0f8da..c613c3df 100644

--- a/tests/unittest/pywbem/test_itermethods.py

+++ b/tests/unittest/pywbem/test_itermethods.py

@@ -24,7 +24,7 @@ from __future__ import absolute_import, print_function

 import pytest

 import six

-from mock import Mock

+from unittest.mock import Mock

 # pylint: disable=wrong-import-position, wrong-import-order, invalid-name

 from ...utils import import_installed

diff --git a/tests/unittest/pywbem/test_valuemapping.py b/tests/unittest/pywbem/test_valuemapping.py

index bf93b87c..263294a5 100644

--- a/tests/unittest/pywbem/test_valuemapping.py

+++ b/tests/unittest/pywbem/test_valuemapping.py

@@ -7,7 +7,7 @@ from __future__ import absolute_import

 import re

 import pytest

-from mock import Mock

+from unittest.mock import Mock

 # pylint: disable=wrong-import-position, wrong-import-order, invalid-name

 from ...utils import import_installed