diff --git a/examples/sinatra/app/src/Gemfile.lock b/examples/sinatra/app/src/Gemfile.lock
index e6304fc7..8ecb64ab 100644
--- a/examples/sinatra/app/src/Gemfile.lock
+++ b/examples/sinatra/app/src/Gemfile.lock
@@ -5,7 +5,7 @@ GEM
     logger (1.6.1)
     mustermann (3.0.3)
       ruby2_keywords (~> 0.0.1)
-    rack (3.1.8)
+    rack (3.1.12)
     rack-protection (4.1.0)
       base64 (>= 0.1.0)
       logger (>= 1.6.0)