diff --git a/.travis.yml b/.travis.yml
index f7a0fc8..0e101c0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,3 +15,6 @@ node_js:
  - "iojs-v1.8"
  - "iojs-v2.0"
  - "iojs-v3.0"
+ - "4"
+ - "5"
+ - "6"