diff --git a/requirements_dev.txt b/requirements_dev.txt
index 3f5cc38..5400473 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,7 +3,7 @@ bumpversion==0.6.0
 wheel==0.37.0
 watchdog==2.1.3
 flake8==3.9.0
-tox==3.24.2
+tox==3.24.4
 coverage==5.5
 cryptography==3.4.8
 Sphinx==4.1.2