diff --git a/.travis.yml b/.travis.yml
index 0c567b0..75d02b3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,8 +18,6 @@ matrix:
   include:
     - php: 5.6
       env: DB=MYSQL CORE_RELEASE=3
-    - php: 5.6
-      env: DB=MYSQL CORE_RELEASE=3.1
     - php: 5.6
       env: DB=PGSQL CORE_RELEASE=3.2
   allow_failures: