diff --git a/.travis.yml b/.travis.yml
index bc9813c..9b0d46b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,7 +17,7 @@ matrix:
     - php: 5.3
       env: DB=PGSQL CORE_RELEASE=3.4
     - php: 5.6
-      env: DB=MYSQL CORE_RELEASE=3.7
+      env: DB=MYSQL CORE_RELEASE=3.6
     - php: 5.4
       env: DB=MYSQL CORE_RELEASE=3.6
     - php: 7.1