diff --git a/Gemfile.lock b/Gemfile.lock
index 2dd9efb..d3f8b11 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -27,21 +27,23 @@ GEM
     mime-types-data (3.2019.0331)
     minitest (5.11.3)
     multi_xml (0.6.0)
-    mustermann (1.0.3)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
     pg (1.1.4)
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    rack (2.0.7)
-    rack-protection (2.0.5)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
-    sinatra (2.0.5)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.5)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
     thread_safe (0.3.6)
-    tilt (2.0.9)
+    tilt (2.0.11)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)