diff --git a/.travis.yml b/.travis.yml
index ba523905..5ece0586 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,10 @@
 language: php
 
 php:
+  - 5.4
+  - 5.5
+  - 5.6
+  - 7.0
   - 7.1
   - 7.2
   - 7.3