diff --git a/with-sinatra/Gemfile.lock b/with-sinatra/Gemfile.lock
index 442e12b0..2ede5386 100644
--- a/with-sinatra/Gemfile.lock
+++ b/with-sinatra/Gemfile.lock
@@ -13,7 +13,7 @@ GEM
     nio4r (2.7.3)
     puma (6.4.3)
       nio4r (~> 2.0)
-    rack (3.1.8)
+    rack (3.1.18)
     rack-protection (4.1.0)
       base64 (>= 0.1.0)
       logger (>= 1.6.0)