diff --git a/circle.yml b/circle.yml
index 7989a72..c02ffa4 100644
--- a/circle.yml
+++ b/circle.yml
@@ -1,3 +1,3 @@
 machine:
   node:
-    version: 4
\ No newline at end of file
+    version: 6
\ No newline at end of file