diff --git a/.travis.yml b/.travis.yml
index c6ad38f..d3960e1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,7 +17,7 @@ cache:
 
 matrix:
   include:
-    - php: 5.5
+    - php: 5.6
       env: 'COMPOSER_FLAGS="--prefer-stable --prefer-lowest"'
 
 before_script: