diff --git a/Gemfile.lock b/Gemfile.lock
index f6d9018..eac2c08 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     mustermann (1.0.2)
-    rack (2.0.4)
+    rack (2.1.4)
     rack-protection (2.0.1)
       rack
     sinatra (2.0.1)