diff --git a/circle.yml b/circle.yml
index 9cdd344..4ff1c88 100644
--- a/circle.yml
+++ b/circle.yml
@@ -1,6 +1,8 @@
 machine:
   pre:
     - npm install -g npm@3
+  node:
+    version: iojs-3.2.0
 
 test:
   pre: