diff --git a/.travis.yml b/.travis.yml
index 8f6a9d8..72632de 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,7 @@ language: php
 php:
   - 5.3
   - 5.4
+  - 5.5
 
 before_script:
   - echo "extension = mongo.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini