diff --git a/circle.yml b/circle.yml
index 38fdfea..d49cfb0 100644
--- a/circle.yml
+++ b/circle.yml
@@ -1,6 +1,6 @@
 machine:
   node:
-    version: v4.2.2
+    version: v6.3.0
 
 test:
   override: