diff --git a/requirements.txt b/requirements.txt
index 1517a3c7..70941df5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ pre-commit==3.8.0
 
 # Testing
 # ------------------------------------------------------------------------------
-tox==4.20.0
+tox==4.21.2
 pytest==8.3.3
 pytest-xdist==3.6.1
 pytest-cookies==0.7.0