diff --git a/Gemfile.lock b/Gemfile.lock
index 58624cb..352a0da 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -46,7 +46,8 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.0331)
     minitest (5.11.3)
-    mustermann (1.0.3)
+    mustermann (3.0.0)
+      ruby2_keywords (~> 0.0.1)
     necromancer (0.5.0)
     netrc (0.11.0)
     pastel (0.7.3)
@@ -56,25 +57,26 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (3.1.1)
-    rack (2.0.7)
-    rack-protection (2.0.5)
+    rack (2.2.4)
+    rack-protection (3.0.4)
       rack
     require_all (2.0.0)
     rest-client (2.0.2)
       http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 4.0)
       netrc (~> 0.8)
-    sinatra (2.0.5)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.5)
+    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-activerecord (2.0.13)
       activerecord (>= 3.2)
       sinatra (>= 1.0)
     sqlite3 (1.4.1)
     thread_safe (0.3.6)
-    tilt (2.0.9)
+    tilt (2.0.11)
     tty-color (0.5.0)
     tty-cursor (0.7.0)
     tty-font (0.4.0)