diff --git a/circle.yml b/circle.yml
index 28cf9dc..247f8d0 100644
--- a/circle.yml
+++ b/circle.yml
@@ -1,6 +1,6 @@
 machine:
   python:
-    version: 3.5.0
+    version: 3.4.2
 
 dependencies:
   pre: