diff --git a/Gemfile.lock b/Gemfile.lock
index 761da98..4c1bd94 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -20,7 +20,7 @@ GEM
     json (1.5.4)
     mime-types (1.16)
     multi_json (1.0.3)
-    rack (1.3.2)
+    rack (2.2.3)
     rack-test (0.6.1)
       rack (>= 1.0)
     xml-simple (1.1.0)