diff --git a/.travis.yml b/.travis.yml
index a2e002a..17be18c 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
 
 script:
  - vendor/bin/phpunit