diff --git a/ruby/src/Gemfile.lock b/ruby/src/Gemfile.lock
index ba3fe8b..7376eb9 100644
--- a/ruby/src/Gemfile.lock
+++ b/ruby/src/Gemfile.lock
@@ -4,7 +4,7 @@ GEM
     backports (3.15.0)
     multi_json (1.13.1)
     mustermann (1.0.3)
-    rack (2.0.7)
+    rack (2.2.3)
     rack-protection (2.0.7)
       rack
     sinatra (2.0.7)