diff --git a/tox.ini b/tox.ini
index 35e18d9c..d5910619 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,7 +2,7 @@
 envlist = py27, py33, py34, py35, py36
 [testenv]
 deps =
-    pytest>=2.3.5, < 3.3
+    pytest>=2.3.5, < 3.7
     pytest-cache
 # docopt for sith doctests
     docopt