diff --git a/.travis.yml b/.travis.yml
index dd08616..9680be4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,8 +3,14 @@ go:
 - 1.2
 - 1.3
 - 1.4
+- 1.5
+- 1.6
 - tip
 
+env:
+  global:
+  - GO15VENDOREXPERIMENT=1
+
 matrix:
   allow_failures:
   - go: tip