diff --git a/setup.py b/setup.py
index 9bc6b96c..6d145e4a 100644
--- a/setup.py
+++ b/setup.py
@@ -83,7 +83,7 @@
         'numpy>=1.16,<1.23',
         'pydantic>=1.7,<1.10',
     ],
-    tests_require=["tox>=3.20,<3.25"],
+    tests_require=["tox>=3.20,<3.28"],
     extras_require={
         'keras': keras_deps,
         'other': other_deps,