diff --git a/tox.ini b/tox.ini
index 9baa094..3144777 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@ envlist = py{27,34,35,36}
 [testenv]
 extras = dev
 deps =
-    setuptools==40.6.2
+    setuptools==34.2.0
 commands =
     pytest