--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,6 +1,5 @@
 -r requirements.txt
 
-mock
 pytest
 pytest-cov
 tox
--- a/tests/test_add_module.py
+++ b/tests/test_add_module.py
@@ -28,7 +28,7 @@ import six
 import tempfile
 import unittest
 from argparse import Namespace
-from mock import patch
+from unittest.mock import patch
 from tests import TEST_DATA_DIR, MockMBSBuildsData, make_mmd, dump_mmd
 from ursa_major.handlers.add_module import AddModuleHandler
 if six.PY3:  # SafeConfigParser == ConfigParser, former deprecated in >= 3.2
--- a/tests/test_check_config.py
+++ b/tests/test_check_config.py
@@ -26,7 +26,7 @@ import os
 import pytest
 import tempfile
 
-from mock import call, patch
+from unittest.mock import call, patch
 from tests import TEST_DATA_DIR, MockMBSBuildsData, make_mmd, dump_mmd
 from ursa_major.cli import main
 
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -27,7 +27,7 @@ import tempfile
 import ursa_major.cli
 import pytest
 
-from mock import patch
+from unittest.mock import patch
 
 
 class TestTagConfigFileCLIOption:
--- a/tests/test_remove_module.py
+++ b/tests/test_remove_module.py
@@ -28,7 +28,7 @@ import six
 import tempfile
 import unittest
 from argparse import Namespace
-from mock import patch
+from unittest.mock import patch
 from tests import TEST_DATA_DIR, MockMBSBuildsData, make_mmd, dump_mmd
 from ursa_major.handlers.remove_module import RemoveModuleHandler
 
--- a/tests/test_add_tag_handler.py
+++ b/tests/test_add_tag_handler.py
@@ -23,7 +23,7 @@
 #            Qixiang Wan <qwan@redhat.com>
 
 import json
-import mock
+from unittest import mock
 import os
 import shutil
 import tempfile
--- a/tests/test_koji_service.py
+++ b/tests/test_koji_service.py
@@ -22,7 +22,7 @@
 # Written by Chenxiong Qi <cqi@redhat.com>
 #            Qixiang Wan <qwan@redhat.com>
 
-import mock
+from unittest import mock
 import unittest
 
 from ursa_major.koji_service import KojiService
--- a/tests/test_mbs.py
+++ b/tests/test_mbs.py
@@ -22,7 +22,7 @@
 # Written by Chenxiong Qi <cqi@redhat.com>
 #            Qixiang Wan <qwan@redhat.com>
 
-import mock
+from unittest import mock
 
 from tests import UrsaMajorTestCase, MockResponse, MockMBSBuildsData
 from ursa_major.mbs import MBS
--- a/tests/test_update_tag.py
+++ b/tests/test_update_tag.py
@@ -23,7 +23,7 @@
 #            Qixiang Wan <qwan@redhat.com>
 
 import json
-import mock
+from unittest import mock
 import os
 import six
 import shutil