diff --git a/Gemfile.lock b/Gemfile.lock
index 8a78c4e034e..1c97b092a1b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -347,7 +347,7 @@ GEM
     msgpack (1.7.2)
     multi_json (1.15.0)
     multipart-post (2.3.0)
-    mysql2 (0.5.5)
+    mysql2 (0.5.6)
     net-http-persistent (4.0.2)
       connection_pool (~> 2.2)
     net-imap (0.4.9)