diff --git a/.travis.yml b/.travis.yml
index d8d4e6e..3bac96e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,7 +7,7 @@ php:
     - 7.4snapshot
 env:
     global:
-        - CORE_BRANCH=master
+        - CORE_BRANCH=stable18
         - APP_NAME=sharepoint
     matrix:
         - DB=sqlite