diff --git a/Gemfile b/Gemfile
index 5f9add18..3c59069b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ group :default do
   if rack_version = ENV['RACK_VERSION']
     gem 'rack', rack_version
   else
-    gem 'rack', '~> 2.2.20'
+    gem 'rack', '~> 3.2.4'
   end
 end
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 0a8c71cd..9919ade6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,8 +6,8 @@ GEM
       rake
       thor (>= 0.14.0)
     diff-lcs (1.6.2)
-    rack (2.2.20)
-    rake (13.3.0)
+    rack (3.2.4)
+    rake (13.3.1)
     rspec (3.13.2)
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)
@@ -17,7 +17,7 @@ GEM
     rspec-expectations (3.13.5)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
-    rspec-mocks (3.13.6)
+    rspec-mocks (3.13.7)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
     rspec-support (3.13.6)
@@ -33,6 +33,6 @@ PLATFORMS
 
 DEPENDENCIES
   appraisal
-  rack (~> 2.2.20)
+  rack (~> 3.2.4)
   rake (~> 13.3)
   rspec