diff --git a/.travis.yml b/.travis.yml
index b2032b9dc..02e9f8d89 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,9 @@
 language: php
 
 php:
+ - 5.4
  - 5.5
+ - 5.6
   
 before_script:
  - pecl install channel://pecl.php.net/pthreads-0.1.0