diff --git a/tox.ini b/tox.ini
index 5e0c74a7d..6de6cc1e9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,7 +2,7 @@
 envlist = py26, py27, py33, py34, py35, py36
 [testenv]
 deps =
-    pytest>=2.3.5
+    pytest>=2.3.5, < 3.3
     pytest-cache
 # docopt for sith doctests
     docopt