diff --git a/.travis.yml b/.travis.yml
index 30100b2..207cfd6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,8 @@ php:
     - 5.3
     - 5.4
     - 5.5
+    - 5.6
+    - hhvm
 
 before_script:
     - composer self-update