diff --git a/requirements_dev.txt b/requirements_dev.txt
index 8274134..d913e24 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,7 +3,7 @@ bumpversion==0.6.0
 wheel==0.36.2
 watchdog==2.1.3
 flake8==3.9.0
-tox==3.23.0
+tox==3.24.1
 coverage==5.5
 cryptography==3.4.7
 Sphinx==4.0.3