diff --git a/setup.py b/setup.py
index d90958b69..3dced5a22 100644
--- a/setup.py
+++ b/setup.py
@@ -48,7 +48,7 @@
       author="Benjamin Peterson",
       author_email="benjamin@python.org",
       url="https://github.com/benjaminp/six",
-      tests_require=["pytest"],
+      tests_require=["pytest<3.3"],
       py_modules=["six"],
       description="Python 2 and 3 compatibility utilities",
       long_description=six_long_description,