diff --git a/.travis.yml b/.travis.yml
index 695ce765..6151c06d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,7 +9,7 @@ php:
 
 env:
   global:
-    - CORE_BRANCH=master
+    - CORE_BRANCH=stable9
   matrix:
     - DB=sqlite