diff --git a/api/ruby/building-your-first-github-app/Gemfile.lock b/api/ruby/building-your-first-github-app/Gemfile.lock
index 5cbe9b946..fe0d3102f 100644
--- a/api/ruby/building-your-first-github-app/Gemfile.lock
+++ b/api/ruby/building-your-first-github-app/Gemfile.lock
@@ -11,7 +11,7 @@ GEM
     octokit (4.9.0)
       sawyer (~> 0.8.0, >= 0.5.3)
     public_suffix (3.0.2)
-    rack (2.0.5)
+    rack (2.2.3)
     rack-protection (2.0.3)
       rack
     sawyer (0.8.1)