diff --git a/tox.ini b/tox.ini
index 8f05b04551f..4566e0d8f85 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,6 +5,7 @@ indexserver =
     preinstall = https://pypi.python.org/simple
 requires=tox-conda 
          setuptools==71.1.0
+         tox<=4.16.0
 
 [base]
 deps =