diff --git a/requirements_dev.txt b/requirements_dev.txt
index 7ac9fb2..9aa5ee5 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ watchdog==0.9.0
 flake8==3.7.8
 coverage==4.5.4
 Sphinx==2.2.0
-tox==3.14.0
+tox==4.23.2
 twine==2.0.0
 
 pytest-runner==5.1