diff --git a/Gemfile.lock b/Gemfile.lock
index 0f4c00f..1a487d6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -61,7 +61,7 @@ GEM
     json (1.6.1)
     json_pure (1.6.1)
     multi_json (1.0.3)
-    rack (1.3.5)
+    rack (1.6.13)
     rack-protection (1.1.4)
       rack
     sinatra (1.3.1)