diff --git a/.travis.yml b/.travis.yml
index d494c8c..61ce1dc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,13 @@ php:
     - 5.3
     - 5.4
     - 5.5
+    - 5.6
+    - hhvm
+    - hhvm-nightly
+
+os:
+    - linux
+    - osx
 
 env:
     - WP_VERSION=latest WP_MULTISITE=0