diff --git a/Gemfile.lock b/Gemfile.lock
index 3ff9a09..1f1ad11 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
     mustermann (1.0.3)
     pg (1.1.4)
     public_suffix (4.0.1)
-    rack (2.0.7)
+    rack (2.2.6.4)
     rack-protection (2.0.7)
       rack
     sinatra (2.0.7)