diff --git a/requirements_dev.txt b/requirements_dev.txt
index 848ec8f..8ba6fff 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,7 +3,7 @@ bump2version==1.0.0
 wheel==0.34.2
 watchdog==0.10.2
 flake8==3.7.9
-tox==3.14.6
+tox==4.23.0
 coverage==5.0.4
 Sphinx==3.0.1
 twine==3.1.1