diff --git a/requirements_dev.txt b/requirements_dev.txt
index 2e9d9fe..e098dc4 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -2,7 +2,7 @@ pip>=20.2.2
 wheel>=0.35.1
 watchdog==2.0.2
 flake8==3.9.0
-tox==3.23.0
+tox==4.4.6
 coverage==5.5
 Sphinx==3.5.2
 twine==3.4.1