diff --git a/example/sinatra/Gemfile.lock b/example/sinatra/Gemfile.lock
index e6e4779..687667c 100644
--- a/example/sinatra/Gemfile.lock
+++ b/example/sinatra/Gemfile.lock
@@ -71,7 +71,7 @@ GEM
     json_pure (1.8.6)
     multi_json (1.13.1)
     public_suffix (3.0.2)
-    rack (1.6.10)
+    rack (1.6.13)
     rack-protection (1.5.5)
       rack
     sinatra (1.4.8)