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