diff --git a/Gemfile.lock b/Gemfile.lock
index c12050c..26af761 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,7 +3,7 @@ GEM
   specs:
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.3)
+    rack (2.2.6.3)
     rack-protection (2.2.0)
       rack
     ruby2_keywords (0.0.5)