diff --git a/Gemfile.lock b/Gemfile.lock
index 6691f833..a20f0f8c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -35,7 +35,7 @@ GEM
       multi_json (~> 1.0)
       multi_xml (~> 0.5)
       rack (~> 1.2)
-    rack (1.5.2)
+    rack (1.6.13)
     rake (0.9.2.2)
     rdoc (3.12.2)
       json (~> 1.4)