diff --git a/tox.ini b/tox.ini
index bc0fbd0..f0f3a40 100644
--- a/tox.ini
+++ b/tox.ini
@@ -17,6 +17,6 @@ deps =
   psycopg2
   pytest-cov
   pytest-django
-  pytest
+  pytest<4.1
 commands =
   py.test {posargs:tests/}