diff --git a/requirements-dev.txt b/requirements-dev.txt
index 467fb0b7..7c12de0d 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,5 +1,4 @@
 docutils
-mock
 Pygments
 pytest
 pytest-cov
diff --git a/test_schedule.py b/test_schedule.py
index 875d5ebc..339f2d75 100644
--- a/test_schedule.py
+++ b/test_schedule.py
@@ -1,7 +1,7 @@
 """Unit tests for schedule.py"""
 import datetime
 import functools
-import mock
+from unittest import mock
 import unittest
 import os
 import time
diff --git a/tox.ini b/tox.ini
index 4e9c5016..b3d60a7f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,7 +14,6 @@ python =
 
 [testenv]
 deps =
-    mock
     pytest
     pytest-cov
     mypy