diff --git a/tox.ini b/tox.ini
index 152c85a08..da6f0eb91 100644
--- a/tox.ini
+++ b/tox.ini
@@ -36,7 +36,7 @@ deps =
   pytest-django
   pytest-random
   mock
-  pytest>=3.3.0
+  pytest>=3.3.0,<4.1
   lxml
   cssselect
   pylint<1.8