diff --git a/.travis.yml b/.travis.yml
index 8df5ea0d..0df94707 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,7 +13,7 @@ addons:
 
 env:
   global:
-    - CORE_BRANCH=master
+    - CORE_BRANCH=stable18
     - APP_NAME=password_policy
   matrix:
     - DB=sqlite