diff --git a/tests/test_ansi2html.py b/tests/test_ansi2html.py
index d725097..b2f4852 100644
--- a/tests/test_ansi2html.py
+++ b/tests/test_ansi2html.py
@@ -26,8 +26,7 @@
 from os.path import abspath, dirname, join
 from subprocess import run
 from typing import List
-
-from mock import patch
+from unittest.mock import patch
 
 from ansi2html import Ansi2HTMLConverter
 from ansi2html.converter import (
diff --git a/tox.ini b/tox.ini
index 64d9d15..dcd5d25 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,6 @@ setenv =
     # PYTHONWARNINGS=error
     COVERAGE_FILE = {env:COVERAGE_FILE:{toxworkdir}/.coverage.{envname}}
 deps =
-    mock
     pytest
     pytest-cov
 sitepackages = False