diff --git a/requirements_dev.txt b/requirements_dev.txt
index 9a28f15..8b4d125 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,7 +1,7 @@
 # test
 -r requirements_test.txt
 Django==1.11.5
-tox==2.8.1
+tox==4.23.0
 
 # docs
 Sphinx==1.6.3