diff --git a/Gemfile.lock b/Gemfile.lock
index 097bcf8..b983da9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -12,12 +12,13 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.1009)
     multi_xml (0.6.0)
-    mustermann (1.0.3)
+    mustermann (3.0.0)
+      ruby2_keywords (~> 0.0.1)
     nio4r (2.5.2)
     puma (4.2.1)
       nio4r (~> 2.0)
-    rack (2.0.7)
-    rack-protection (2.0.7)
+    rack (2.2.4)
+    rack-protection (3.0.4)
       rack
     rubotnik (0.2.3)
       dotenv
@@ -26,13 +27,14 @@ GEM
       puma
       sinatra
       thor
-    sinatra (2.0.7)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.7)
+    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)
     thor (0.20.3)
-    tilt (2.0.10)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby