diff --git a/.travis.yml b/.travis.yml
index 2c7b9aae..858478bc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,7 @@
 language: php
 php:
+    - 5.4
+    - 5.5
     - 5.6
     - 7.0
     - 7.1