--- a/tests/unit/test_venv.py
+++ b/tests/unit/test_venv.py
@@ -1,4 +1,4 @@
-import mock
+from unittest.mock import patch
 
 import pytest_virtualenv as venv
 from pytest_shutil import env
@@ -6,7 +6,7 @@ from pytest_shutil import env
 
 def test_PYTHONPATH_not_present_in_testing_env_if_set():
     with env.set_env('PYTHONPATH', 'fred'):
-        with mock.patch.object(venv.Workspace, 'run') as run:
+        with patch.object(venv.Workspace, 'run') as run:
             venv.VirtualEnv()
             call = run.mock_calls[0]
             assert 'PYTHONPATH' not in call[2]['env']
@@ -18,7 +18,7 @@ def test_PYTHONPATH_not_present_in_testi
 
 def test_PYTHONPATH_not_present_in_testing_env_if_unset():
     with env.no_env('PYTHONPATH'):
-        with mock.patch.object(venv.Workspace, 'run') as run:
+        with patch.object(venv.Workspace, 'run') as run:
             venv.VirtualEnv()
             call = run.mock_calls[0]
             assert 'PYTHONPATH' not in call[2]['env']