diff --git a/requirements_dev.txt b/requirements_dev.txt
index a7d0525..560fe5f 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,6 +1,6 @@
 -r requirements.txt
 -r requirements_lint.txt
 -r requirements_test.txt
-tox==4.20.0
+tox==4.21.2
 
 -e .