diff --git a/Gemfile.lock b/Gemfile.lock
index fcfe811..f1bd4fa 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -38,7 +38,7 @@ GEM
     logger (1.6.1)
     mock_redis (0.45.0)
     multipart-post (2.4.1)
-    mustermann (3.0.0)
+    mustermann (3.0.3)
       ruby2_keywords (~> 0.0.1)
     net-http (0.4.1)
       uri
@@ -56,8 +56,9 @@ GEM
     rack (3.1.8)
     rack-cors (2.0.2)
       rack (>= 2.0.0)
-    rack-protection (4.0.0)
+    rack-protection (4.1.0)
       base64 (>= 0.1.0)
+      logger (>= 1.6.0)
       rack (>= 3.0.0, < 4)
     rack-session (2.0.0)
       rack (>= 3.0.0)
@@ -119,14 +120,15 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
-    sinatra (4.0.0)
+    sinatra (4.1.0)
+      logger (>= 1.6.0)
       mustermann (~> 3.0)
       rack (>= 3.0.0, < 4)
-      rack-protection (= 4.0.0)
+      rack-protection (= 4.1.0)
       rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
     stringio (3.1.1)
-    tilt (2.3.0)
+    tilt (2.4.0)
     unicode-display_width (2.6.0)
     unicorn (6.1.0)
       kgio (~> 2.6)
diff --git a/app.rb b/app.rb
index 9f3f721..3849ce0 100644
--- a/app.rb
+++ b/app.rb
@@ -11,6 +11,7 @@ class Rubies < Sinatra::Base
   configure do
     set :logging,    true
     set :protection, except: [:json_csrf]
+    set :host_authorization, { permitted_hosts: [] }
   end
 
   configure :production do