diff --git a/backbonejs-examples/ex1/Gemfile.lock b/backbonejs-examples/ex1/Gemfile.lock
index 47cd03f..fa777fa 100644
--- a/backbonejs-examples/ex1/Gemfile.lock
+++ b/backbonejs-examples/ex1/Gemfile.lock
@@ -9,7 +9,7 @@ GEM
       multi_json (~> 1.0)
     haml (3.1.4)
     multi_json (1.1.0)
-    rack (1.4.1)
+    rack (1.6.12)
     rack-protection (1.2.0)
       rack
     redis (2.2.2)