diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d66c773..6a98b0c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,6 @@ jobs:
           - '2.7'
           - '2.6'
         rack:
-          - '1.5'
           - '1.6'
           - '2.0'
           - '2.1'
diff --git a/Appraisals b/Appraisals
index f99fdc0..d00073e 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,7 +1,3 @@
-appraise 'rack-1.5' do
-  gem 'rack', '~> 1.5.0'
-end
-
 appraise 'rack-1.6' do
   gem 'rack', '~> 1.6.0'
 end
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d81f611..65538bb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## Unreleased
+
+  * Drop support for Rack 1.5 ([Tyler Hunt][tylerhunt])
+
 ## 1.2.0 (2023-04-14)
 
   * Add support for Rack 3.0 ([Vinny Diehl][vinnydiehl])
diff --git a/gemfiles/rack_1.5.gemfile b/gemfiles/rack_1.5.gemfile
deleted file mode 100644
index ff1f314..0000000
--- a/gemfiles/rack_1.5.gemfile
+++ /dev/null
@@ -1,7 +0,0 @@
-# This file was generated by Appraisal
-
-source "https://rubygems.org"
-
-gem "rack", "~> 1.5.0"
-
-gemspec path: "../"
diff --git a/rack-canonical-host.gemspec b/rack-canonical-host.gemspec
index cbc615f..4f20b7c 100644
--- a/rack-canonical-host.gemspec
+++ b/rack-canonical-host.gemspec
@@ -9,7 +9,7 @@ Gem::Specification.new do |gem|
   gem.author = 'Tyler Hunt'
 
   gem.add_dependency 'addressable', '> 0', '< 3'
-  gem.add_dependency 'rack', '>= 1', '< 4'
+  gem.add_dependency 'rack', '>= 1.6', '< 4'
   gem.add_development_dependency 'appraisal', '~> 2.2'
   gem.add_development_dependency 'rake', '~> 13.0'
   gem.add_development_dependency 'rspec', '~> 3.0'