diff --git a/Gemfile.lock b/Gemfile.lock
index 474e1b2..b41d077 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     mustermann (1.0.3)
-    rack (2.0.7)
+    rack (2.2.3)
     rack-protection (2.0.5)
       rack
     sinatra (2.0.5)