diff --git a/tutorials/ruby/Gemfile.lock b/tutorials/ruby/Gemfile.lock
index 1e202bc..a34d465 100644
--- a/tutorials/ruby/Gemfile.lock
+++ b/tutorials/ruby/Gemfile.lock
@@ -3,7 +3,7 @@ GEM
   specs:
     metaparticle (0.0.0.6)
     mustermann (1.0.1)
-    rack (2.0.3)
+    rack (2.2.3)
     rack-protection (2.0.0)
       rack
     sinatra (2.0.0)