diff --git a/Gemfile.lock b/Gemfile.lock
index ecf8c09..4125d34 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -25,7 +25,7 @@ GEM
     hashr (2.0.1)
     multi_json (1.13.1)
     mustermann (1.0.3)
-    rack (2.0.6)
+    rack (2.1.4)
     rack-protection (2.0.4)
       rack
     rack-ssl (1.4.1)