diff --git a/.travis.yml b/.travis.yml
index ed5ea02..90f1190 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,5 +2,6 @@ language: php
 php:
   - 5.3
   - 5.4
+  - 5.5
 before_script: composer install
 script: "./vendor/bin/phpunit && ./vendor/bin/phpcs -n src/"