diff --git a/Gemfile.lock b/Gemfile.lock
index 337429e..33e6314 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -46,7 +46,7 @@ GEM
     mustermann (1.0.3)
     os (1.0.0)
     public_suffix (3.0.3)
-    rack (2.0.6)
+    rack (2.2.3)
     rack-protection (2.0.5)
       rack
     rake (10.5.0)