diff --git a/.travis.yml b/.travis.yml
index d2bd36d..624ac57 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,8 +5,14 @@ php:
   - 5.3
   - 5.4
   - 5.5
+  - 5.6
+  - hhvm
+
+matrix:
+  allow_failures:
+      - php: hhvm
 
 before_script:
   - composer install --dev --prefer-source
 
-script: phpunit
+script: phpunit --coverage-text