diff --git a/Gemfile.lock b/Gemfile.lock
index 8b6a7480..84ec1fc4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -301,7 +301,7 @@ GEM
       railties (>= 3.0)
     multi_json (1.15.0)
     multi_xml (0.6.0)
-    mysql2 (0.5.5)
+    mysql2 (0.5.6)
     net-imap (0.3.7)
       date
       net-protocol