diff --git a/.travis.yml b/.travis.yml
index 49878ea7..03d23a68 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,6 @@
 language: php
 php:
+    - '5.3'
     - '5.4'
     - '5.5'
     - '5.6'