diff --git a/.travis.yml b/.travis.yml
index a762e2a6651a3eaf46354ad753596b89a4cf14b5..aee864b4a7a4d9644af4d0e2ec29392ec018b7ff 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,12 @@ php:
   - 5.3
   - 5.4
   - 5.5
+  - 5.6
+  - hhvm
+
+matrix:
+  allow_failures:
+    - php: hhvm
 
 before_script: composer install