diff --git a/Gemfile.lock b/Gemfile.lock
index 3a861e1..65cda20 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -49,7 +49,7 @@ GEM
     mustermann-grape (1.0.1)
       mustermann (>= 1.0.0)
     mysql2 (0.5.3)
-    rack (2.2.3)
+    rack (3.0.7)
     rack-accept (0.4.5)
       rack (>= 0.4)
     ruby2_keywords (0.0.4)