diff --git a/requirements_dev.txt b/requirements_dev.txt
index 456b779..f892da8 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,7 +3,7 @@ bump2version==1.0.1
 wheel==0.36.2
 watchdog==2.0.2
 flake8==3.9.0
-tox==3.23.0
+tox==4.23.0
 coverage==5.5
 Sphinx==3.5.2
 pyinstaller==4.2