diff --git a/.travis.yml b/.travis.yml
index f7bed72c3d..626b90c50d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,7 +8,9 @@ language: php
 
 # list any PHP version you want to test against
 php:
+  - 5.6
   - 7.0
+  - nightly
 
 # execute any number of scripts before the test run, custom env's are available as variables
 before_script: