diff --git a/requirements_dev.txt b/requirements_dev.txt
index ff4ed5c..ebdf531 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ bump2version==0.5.11
 wheel==0.33.6
 watchdog==0.9.0
 flake8==3.7.9
-tox==3.14.1
+tox==4.14.2
 coverage==4.5.4
 Sphinx==2.2.1
 twine==3.1.0