diff --git a/requirements/tox.txt b/requirements/tox.txt
index 8c89d3f..8a578e2 100644
--- a/requirements/tox.txt
+++ b/requirements/tox.txt
@@ -4,4 +4,4 @@
 
 -r test.txt
 
-tox==3.20.1
+tox==4.3.5