diff --git a/Gemfile.lock b/Gemfile.lock
index 7069bb1c..a0b4875d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -126,7 +126,7 @@ GEM
     mini_portile2 (2.8.7)
     minitest (5.15.0)
     multi_json (1.15.0)
-    mustermann (2.0.2)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     mustermann-grape (1.0.2)
       mustermann (>= 1.0.0)