diff --git a/test/unit/module/cfn_json/test_cfn_json.py b/test/unit/module/cfn_json/test_cfn_json.py
index fdbd1232ce..b9a8ea6423 100644
--- a/test/unit/module/cfn_json/test_cfn_json.py
+++ b/test/unit/module/cfn_json/test_cfn_json.py
@@ -4,7 +4,7 @@
 """
 from test.testlib.testcase import BaseTestCase
 from six import StringIO
-from mock import patch
+from unittest.mock import patch
 from cfnlint.template import Template  # pylint: disable=E0401
 from cfnlint.rules import RulesCollection
 from cfnlint.core import DEFAULT_RULESDIR  # pylint: disable=E0401
diff --git a/test/unit/module/cfn_yaml/test_yaml.py b/test/unit/module/cfn_yaml/test_yaml.py
index eda754fab6..4a50e4029e 100644
--- a/test/unit/module/cfn_yaml/test_yaml.py
+++ b/test/unit/module/cfn_yaml/test_yaml.py
@@ -4,7 +4,7 @@
 """
 from test.testlib.testcase import BaseTestCase
 from six import StringIO
-from mock import patch
+from unittest.mock import patch
 from cfnlint.template import Template  # pylint: disable=E0401
 from cfnlint.rules import RulesCollection
 from cfnlint.core import DEFAULT_RULESDIR  # pylint: disable=E0401
diff --git a/test/unit/module/config/test_config_file_args.py b/test/unit/module/config/test_config_file_args.py
index b98d8d5c61..e1c5dfb1c9 100644
--- a/test/unit/module/config/test_config_file_args.py
+++ b/test/unit/module/config/test_config_file_args.py
@@ -5,7 +5,7 @@
 import logging
 from test.testlib.testcase import BaseTestCase
 import jsonschema
-from mock import patch
+from unittest.mock import patch
 import cfnlint.config  # pylint: disable=E0401
 try:  # pragma: no cover
     from pathlib import Path
diff --git a/test/unit/module/config/test_config_mixin.py b/test/unit/module/config/test_config_mixin.py
index 1c3213af91..763abf4635 100644
--- a/test/unit/module/config/test_config_mixin.py
+++ b/test/unit/module/config/test_config_mixin.py
@@ -5,7 +5,7 @@
 import logging
 import os
 from test.testlib.testcase import BaseTestCase
-from mock import patch
+from unittest.mock import patch
 import cfnlint.config  # pylint: disable=E0401
 from cfnlint.helpers import REGIONS
 
diff --git a/test/unit/module/core/test_run_cli.py b/test/unit/module/core/test_run_cli.py
index 57230558f5..d6a71ffa79 100644
--- a/test/unit/module/core/test_run_cli.py
+++ b/test/unit/module/core/test_run_cli.py
@@ -7,7 +7,7 @@
 from six import StringIO
 import cfnlint.core  # pylint: disable=E0401
 import cfnlint.config  # pylint: disable=E0401
-from mock import patch
+from unittest.mock import patch
 
 
 LOGGER = logging.getLogger('cfnlint')
diff --git a/test/unit/module/custom_rules/test_custom_rules.py b/test/unit/module/custom_rules/test_custom_rules.py
index 818e5a7213..d2eb640eb0 100644
--- a/test/unit/module/custom_rules/test_custom_rules.py
+++ b/test/unit/module/custom_rules/test_custom_rules.py
@@ -4,7 +4,7 @@
 """
 from test.testlib.testcase import BaseTestCase
 from six import StringIO
-from mock import patch
+from unittest.mock import patch
 from cfnlint.template import Template  # pylint: disable=E0401
 from cfnlint.rules import RulesCollection
 from cfnlint.core import DEFAULT_RULESDIR  # pylint: disable=E0401
diff --git a/test/unit/module/helpers/test_downloads_metadata.py b/test/unit/module/helpers/test_downloads_metadata.py
index 7a027b0f56..f76517cd55 100644
--- a/test/unit/module/helpers/test_downloads_metadata.py
+++ b/test/unit/module/helpers/test_downloads_metadata.py
@@ -5,7 +5,7 @@
 import sys
 import os
 from test.testlib.testcase import BaseTestCase
-from mock import patch, MagicMock, mock_open
+from unittest.mock import patch, MagicMock, mock_open
 import cfnlint.helpers
 import json
 
diff --git a/test/unit/module/helpers/test_get_url_content.py b/test/unit/module/helpers/test_get_url_content.py
index 95f4ec3ee2..6054d38cf1 100644
--- a/test/unit/module/helpers/test_get_url_content.py
+++ b/test/unit/module/helpers/test_get_url_content.py
@@ -9,7 +9,7 @@
 except:
     pass
 from test.testlib.testcase import BaseTestCase
-from mock import patch, MagicMock
+from unittest.mock import patch, MagicMock
 import cfnlint.helpers
 
 
@@ -146,4 +146,4 @@ def test_url_has_newer_version_negative(self, mock_load_metadata, mocked_urlopen
         mocked_urlopen.return_value = cm
 
         result = cfnlint.helpers.url_has_newer_version(url)
-        self.assertTrue(result)
\ No newline at end of file
+        self.assertTrue(result)
diff --git a/test/unit/module/maintenance/test_update_documentation.py b/test/unit/module/maintenance/test_update_documentation.py
index 1837e72c50..3c2e2f46bd 100644
--- a/test/unit/module/maintenance/test_update_documentation.py
+++ b/test/unit/module/maintenance/test_update_documentation.py
@@ -5,7 +5,7 @@
 import sys
 import logging
 from test.testlib.testcase import BaseTestCase
-from mock import patch, mock_open, call
+from unittest.mock import patch, mock_open, call
 import cfnlint.maintenance
 from cfnlint.rules import CloudFormationLintRule, RulesCollection
 
diff --git a/test/unit/module/maintenance/test_update_iam_policies.py b/test/unit/module/maintenance/test_update_iam_policies.py
index e0bf53eb93..c202d9fed4 100644
--- a/test/unit/module/maintenance/test_update_iam_policies.py
+++ b/test/unit/module/maintenance/test_update_iam_policies.py
@@ -5,7 +5,7 @@
 import sys
 import logging
 from test.testlib.testcase import BaseTestCase
-from mock import patch
+from unittest.mock import patch
 import cfnlint.maintenance
 
 LOGGER = logging.getLogger('cfnlint.maintenance')
diff --git a/test/unit/module/maintenance/test_update_resource_specs.py b/test/unit/module/maintenance/test_update_resource_specs.py
index da4da10b6c..71cbe20b6f 100644
--- a/test/unit/module/maintenance/test_update_resource_specs.py
+++ b/test/unit/module/maintenance/test_update_resource_specs.py
@@ -6,7 +6,7 @@
 import logging
 import zipfile
 from test.testlib.testcase import BaseTestCase
-from mock import patch, MagicMock, Mock, ANY
+from unittest.mock import patch, MagicMock, Mock, ANY
 import cfnlint.maintenance
 try:
     from urllib.request import urlopen, Request
diff --git a/tox.ini b/tox.ini
index c1391041d9..4a0ab90b99 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,7 +8,6 @@ commands =
   coverage xml
 skip_install = True
 deps =
-  mock
   coverage
   pydot
 setenv =