diff --git a/Gemfile.lock b/Gemfile.lock
index 4c528c2..0cadd0f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -42,6 +42,8 @@ GEM
     method_source (0.8.2)
     mini_portile2 (2.4.0)
     multi_json (1.10.1)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
     nio4r (2.5.2)
     nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
@@ -51,24 +53,26 @@ GEM
       slop (~> 3.4)
     puma (4.3.3)
       nio4r (~> 2.0)
-    rack (1.6.13)
+    rack (2.2.3)
     rack-flash (0.1.2)
       rack
-    rack-protection (1.5.5)
+    rack-protection (2.2.0)
       rack
     rake (13.0.1)
     rb-fsevent (0.9.4)
     rb-inotify (0.9.5)
       ffi (>= 0.5.0)
+    ruby2_keywords (0.0.5)
     sass (3.4.2)
-    sinatra (1.4.5)
-      rack (~> 1.4)
-      rack-protection (~> 1.4)
-      tilt (~> 1.3, >= 1.3.4)
+    sinatra (2.2.0)
+      mustermann (~> 1.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
+      tilt (~> 2.0)
     slop (3.6.0)
     temple (0.8.2)
     thor (0.19.1)
-    tilt (1.4.1)
+    tilt (2.0.10)
     timers (1.1.0)
 
 PLATFORMS