diff --git a/Gemfile.lock b/Gemfile.lock
index 921a609..8dc510a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -64,7 +64,7 @@ GEM
     mercenary (0.4.0)
     methodphitamine (1.0.0)
     mime-types (1.25.1)
-    mustermann (1.1.1)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     oyster (0.9.5)
     packr (3.2.1)
@@ -73,8 +73,8 @@ GEM
       forwardable-extended (~> 2.6)
     posix-spawn (0.3.15)
     public_suffix (4.0.6)
-    rack (2.2.3)
-    rack-protection (2.1.0)
+    rack (2.2.4)
+    rack-protection (3.0.4)
       rack
     rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
@@ -85,14 +85,14 @@ GEM
     safe_yaml (1.0.5)
     sassc (2.4.0)
       ffi (~> 1.9)
-    sinatra (2.1.0)
-      mustermann (~> 1.0)
-      rack (~> 2.2)
-      rack-protection (= 2.1.0)
+    sinatra (3.0.4)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.4)
       tilt (~> 2.0)
     terminal-table (2.0.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
-    tilt (2.0.10)
+    tilt (2.0.11)
     unicode-display_width (1.7.0)
 
 PLATFORMS