diff --git a/backbonejs-examples/ex2/Gemfile.lock b/backbonejs-examples/ex2/Gemfile.lock
index c769fef..2baec24 100644
--- a/backbonejs-examples/ex2/Gemfile.lock
+++ b/backbonejs-examples/ex2/Gemfile.lock
@@ -32,7 +32,7 @@ GEM
     hiredis (0.3.2)
     json (1.4.6)
     multi_json (1.1.0)
-    rack (1.4.1)
+    rack (1.6.12)
     rack-protection (1.2.0)
       rack
     redis (2.2.2)