diff --git a/.travis.yml b/.travis.yml
index 1d91756..11d51b4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,11 @@
 language: php
 
 php:
+    - 5.4
+    - 5.5
+    - 5.6
     - 7
-    - 7.1
+    - hhvm
 
 before_install:
     - export PATH=$HOME/.local/bin:$PATH