diff --git a/requirements_dev.txt b/requirements_dev.txt
index 1aebd77..d8e3109 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -2,7 +2,7 @@ pip>=20.2.2
 wheel>=0.34.2
 watchdog==2.1.3
 flake8==3.9.2
-tox==3.24.0
+tox==4.4.6
 coverage==5.5
 Sphinx==4.1.1
 sphinx-automodapi==0.13