diff --git a/api/ruby/building-your-first-github-app/Gemfile.lock b/api/ruby/building-your-first-github-app/Gemfile.lock
index db7be5c91..3692b79b4 100644
--- a/api/ruby/building-your-first-github-app/Gemfile.lock
+++ b/api/ruby/building-your-first-github-app/Gemfile.lock
@@ -33,7 +33,7 @@ GEM
     octokit (4.9.0)
       sawyer (~> 0.8.0, >= 0.5.3)
     public_suffix (5.0.1)
-    rack (2.2.6.4)
+    rack (2.2.8.1)
     rack-protection (2.2.3)
       rack
     ruby2_keywords (0.0.5)