diff --git a/tox.ini b/tox.ini
index 67ff6bb..5b5246a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,7 +2,7 @@
 envlist = py26, py27, py33, py34, py35, py36
 [testenv]
 deps =
-    pytest>=3.0.7
+    pytest>=3.0.7, < 3.3
 # For --lf and --ff.
     pytest-cache
 setenv =