diff --git a/tox.ini b/tox.ini
index 3c97e65..a40d7dc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,7 +16,7 @@ deps =
   django111: django>=1.11,<1.12
   pytest-cov
   pytest-django
-  pytest
+  pytest<4.1
   WebTest
   mock
   httmock