diff --git a/Gemfile.lock b/Gemfile.lock
index 9a7a436..ae74311 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,6 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    backports (3.15.0)
     haml (5.1.2)
       temple (>= 0.8.0)
       tilt
@@ -11,23 +10,24 @@ GEM
     mime-types (3.3)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.1009)
-    multi_json (1.14.1)
+    multi_json (1.15.0)
     multi_xml (0.6.0)
-    mustermann (1.0.3)
-    rack (2.0.7)
-    rack-protection (2.0.7)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.3)
+    rack-protection (2.2.0)
       rack
-    sinatra (2.0.7)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.0)
       mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.7)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
       tilt (~> 2.0)
-    sinatra-contrib (2.0.7)
-      backports (>= 2.8.2)
+    sinatra-contrib (2.2.0)
       multi_json
       mustermann (~> 1.0)
-      rack-protection (= 2.0.7)
-      sinatra (= 2.0.7)
+      rack-protection (= 2.2.0)
+      sinatra (= 2.2.0)
       tilt (~> 2.0)
     sinatra-reloader (1.0)
       sinatra-contrib