diff --git a/.travis.yml b/.travis.yml
index a93f41b..41a68a4 100755
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,7 +9,7 @@ env:
 matrix:
   include:
     - php: 5.4
-      env: DB=MYSQL CORE_RELEASE=master
+      env: DB=MYSQL CORE_RELEASE=3.1
 
 before_script:
   - phpenv rehash