diff --git a/Gemfile.lock b/Gemfile.lock
index ee381a8..47112c6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -21,24 +21,24 @@ GEM
     minitest (5.14.2)
     multi_json (1.15.0)
     multi_xml (0.6.0)
-    mustermann (1.1.1)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.3)
-    rack-protection (2.1.0)
+    rack (2.2.4)
+    rack-protection (3.0.4)
       rack
-    ruby2_keywords (0.0.2)
-    sinatra (2.1.0)
-      mustermann (~> 1.0)
-      rack (~> 2.2)
-      rack-protection (= 2.1.0)
+    ruby2_keywords (0.0.5)
+    sinatra (3.0.4)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.4)
       tilt (~> 2.0)
-    sinatra-contrib (2.1.0)
+    sinatra-contrib (3.0.4)
       multi_json
-      mustermann (~> 1.0)
-      rack-protection (= 2.1.0)
-      sinatra (= 2.1.0)
+      mustermann (~> 3.0)
+      rack-protection (= 3.0.4)
+      sinatra (= 3.0.4)
       tilt (~> 2.0)
-    tilt (2.0.10)
+    tilt (2.0.11)
     tzinfo (2.0.3)
       concurrent-ruby (~> 1.0)
     zeitwerk (2.4.2)