diff --git a/Gemfile b/Gemfile
index bb5e97f..e1bbd4d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,7 +12,7 @@ group :test do
   gem 'capybara'
   gem 'capybara-selenium'
   gem 'pry-byebug'
-  gem 'rackup'
+  gem 'rackup', '>= 2.2.0'
   gem 'rack-test', '>= 2.0.0'
   gem 'rspec'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index c8faee0..6597496 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -41,7 +41,7 @@ GEM
     puma (6.4.2)
       nio4r (~> 2.0)
     racc (1.7.3)
-    rack (3.0.9.1)
+    rack (3.0.11)
     rack-protection (4.0.0)
       base64 (>= 0.1.0)
       rack (>= 3.0.0, < 4)
@@ -49,9 +49,8 @@ GEM
       rack (>= 3.0.0)
     rack-test (2.1.0)
       rack (>= 1.3)
-    rackup (2.1.0)
+    rackup (2.2.0)
       rack (>= 3)
-      webrick (~> 1.8)
     rake (13.0.6)
     regexp_parser (2.9.0)
     rexml (3.2.6)
@@ -82,7 +81,6 @@ GEM
       rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
     tilt (2.3.0)
-    webrick (1.8.1)
     websocket (1.2.10)
     xpath (3.2.0)
       nokogiri (~> 1.8)
@@ -100,7 +98,7 @@ DEPENDENCIES
   puma
   rack (~> 3.0.9)
   rack-test (>= 2.0.0)
-  rackup
+  rackup (>= 2.2.0)
   rake (~> 13.0.0)
   rspec
   sinatra (~> 4.0.0)