diff --git a/setup.py b/setup.py
index d25db4b..df2ea09 100644
--- a/setup.py
+++ b/setup.py
@@ -14,7 +14,7 @@
     'sorl-thumbnail',
     'factory-boy>=3.2,<3.3',
     'coverage>=5.5,<6.4',
-    'tox>=3.17,<3.26',
+    'tox>=3.17,<4.2',
 ]