diff --git a/examples/sinatra/Gemfile.lock b/examples/sinatra/Gemfile.lock
index 39e76bd3..5ac7625f 100644
--- a/examples/sinatra/Gemfile.lock
+++ b/examples/sinatra/Gemfile.lock
@@ -1,12 +1,13 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    rack (1.3.3)
+    rack (3.0.9.1)
     sinatra (1.0)
       rack (>= 1.0)
 
 PLATFORMS
   java
+  ruby
 
 DEPENDENCIES
   sinatra