diff --git a/technology/guides/08-Continuous-Integration/simple-sinatra-app/Gemfile.lock b/technology/guides/08-Continuous-Integration/simple-sinatra-app/Gemfile.lock
index cc67f8a..554681c 100644
--- a/technology/guides/08-Continuous-Integration/simple-sinatra-app/Gemfile.lock
+++ b/technology/guides/08-Continuous-Integration/simple-sinatra-app/Gemfile.lock
@@ -7,7 +7,7 @@ GEM
     nio4r (2.7.0)
     puma (5.6.8)
       nio4r (~> 2.0)
-    rack (2.2.8.1)
+    rack (2.2.20)
     rack-protection (2.2.3)
       rack
     rspec (3.11.0)