diff --git a/requirements/tox.txt b/requirements/tox.txt
index eecc2af2..31d9dae1 100644
--- a/requirements/tox.txt
+++ b/requirements/tox.txt
@@ -1,3 +1,3 @@
 -r ./coverage.txt
-tox==4.18.1
+tox==4.21.2
 tox-gh-actions==3.2.0