diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index a74c597..d0e5e5c 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -22,11 +22,11 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rails-version: ['5.2.8.1', '6.0.3.7', '6.1.7.6', '7.0.8', '7.1.2', 'main']
-        ruby-version: ['2.7', '3.0', '3.1', '3.2']
+        rails-version: ['5.2.8.1', '6.1.7.6', '7.0.8', '7.1.2', 'main']
+        ruby-version: ['2.7', '3.0', '3.1', '3.2', '3.3']
         exclude:
-          - rails-version: '5.2.5'
-            ruby-version: '3.0'
+          - rails-version: '5.2.8.1'
+            ruby-version: '3.3'
 
     env:
       RAILS_VERSION: ${{ matrix.rails-version }}
@@ -34,10 +34,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Set up Ruby
-    # To automatically get bug fixes and new Ruby versions for ruby/setup-ruby,
-    # change this to (see https://github.com/ruby/setup-ruby#versioning):
-    # uses: ruby/setup-ruby@v1
-      uses: ruby/setup-ruby@55283cc23133118229fd3f97f9336ee23a179fcf # v1.146.0
+      uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby-version }}
         bundler-cache: true # runs 'bundle install' and caches installed gems automatically
diff --git a/README.rdoc b/README.rdoc
index c797579..89a6266 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -6,7 +6,7 @@ This gem hooks into the Rack middleware of Rails. This way all paths are downcas
 
 == Requirements
 
-This gem is tested with 5.2.x, 6.0.x, 6.1.x., 7.x. It reportedly also works with Sinatra, although I do not use Sinatra myself. Sinatra test-cases will be most welcome.
+This gem is tested with 5.2.x, 6.x, 7.x. It reportedly also works with Sinatra, although I do not use Sinatra myself. Sinatra test-cases will be most welcome.
 
 It has previously worked - and I presume still works - in Rails 5.0.x and 5.1.x.
 
diff --git a/test.rb b/test.rb
deleted file mode 100644
index 792f384..0000000
--- a/test.rb
+++ /dev/null
@@ -1,103 +0,0 @@
-# frozen_string_literal: true
-
-gem "activesupport"
-# require 'active_support/all'
-require "route_downcaser"
-require "route_downcaser/downcase_route_middleware"
-require "route_downcaser/original_downcase_route_middleware"
-
-require "benchmark"
-
-class FakeApp
-  def call(env)
-  end
-end
-
-ITERATIONS = 1_000_000
-
-app = FakeApp.new
-original_downcaser = RouteDowncaser::OriginalDowncaseRouteMiddleware.new(app)
-optimized_downcaser = RouteDowncaser::DowncaseRouteMiddleware.new(app)
-
-Benchmark.bmbm do |bm|
-  # bm.report("Original with small env") do
-  #   ITERATIONS.times do
-  #     env = {
-  #       "PATH_INFO" => "/Here/Or/There",
-  #       "REQUEST_URI" => "/Here/Or/There",
-  #       "REQUEST_METHOD" => "GET",
-  #     }
-  #     original_downcaser.call(env)
-  #   end
-  # end
-  bm.report("Original") do
-    ITERATIONS.times do
-      env = {
-        "PATH_INFO" => "/Here/Or/There",
-        "REQUEST_URI" => "/Here/Or/There",
-        "REQUEST_METHOD" => "GET",
-        "GATEWAY_INTERFACE" => "GATEWAY_INTERFACE",
-        "HTTP_ACCEPT" => "HTTP_ACCEPT",
-        "HTTP_ACCEPT_CHARSET" => "HTTP_ACCEPT_CHARSET",
-        "HTTP_ACCEPT_ENCODING" => "HTTP_ACCEPT_ENCODING",
-        "HTTP_ACCEPT_LANGUAGE" => "HTTP_ACCEPT_LANGUAGE",
-        "HTTP_CACHE_CONTROL" => "HTTP_CACHE_CONTROL",
-        "HTTP_CONNECTION" => "HTTP_CONNECTION",
-        "HTTP_COOKIE" => "HTTP_COOKIE",
-        "HTTP_HOST" => "HTTP_HOST",
-        "HTTP_KEEP_ALIVE" => "HTTP_KEEP_ALIVE",
-        "HTTP_REFERER" => "HTTP_REFERER",
-        "HTTP_USER_AGENT" => "HTTP_USER_AGENT",
-        "QUERY_STRING" => "QUERY_STRING",
-        "REMOTE_ADDR" => "REMOTE_ADDR",
-        "REMOTE_HOST" => "REMOTE_HOST",
-        "REMOTE_USER" => "REMOTE_USER",
-        "SERVER_NAME" => "SERVER_NAME",
-        "SERVER_PORT" => "SERVER_PORT",
-        "SERVER_PROTOCOL" => "SERVER_PROTOCOL",
-        "SERVER_SOFTWARE" => "SERVER_SOFTWARE"
-      }
-      original_downcaser.call(env)
-    end
-  end
-  # bm.report("Optimized with small env") do
-  #   ITERATIONS.times do
-  #     env = {
-  #       "PATH_INFO" => "/Here/Or/There",
-  #       "REQUEST_URI" => "/Here/Or/There",
-  #       "REQUEST_METHOD" => "GET",
-  #     }
-  #     optimized_downcaser.call(env)
-  #   end
-  # end
-  bm.report("Optimized") do
-    ITERATIONS.times do
-      env = {
-        "PATH_INFO" => "/Here/Or/There",
-        "REQUEST_URI" => "/Here/Or/There",
-        "REQUEST_METHOD" => "GET",
-        "GATEWAY_INTERFACE" => "GATEWAY_INTERFACE",
-        "HTTP_ACCEPT" => "HTTP_ACCEPT",
-        "HTTP_ACCEPT_CHARSET" => "HTTP_ACCEPT_CHARSET",
-        "HTTP_ACCEPT_ENCODING" => "HTTP_ACCEPT_ENCODING",
-        "HTTP_ACCEPT_LANGUAGE" => "HTTP_ACCEPT_LANGUAGE",
-        "HTTP_CACHE_CONTROL" => "HTTP_CACHE_CONTROL",
-        "HTTP_CONNECTION" => "HTTP_CONNECTION",
-        "HTTP_COOKIE" => "HTTP_COOKIE",
-        "HTTP_HOST" => "HTTP_HOST",
-        "HTTP_KEEP_ALIVE" => "HTTP_KEEP_ALIVE",
-        "HTTP_REFERER" => "HTTP_REFERER",
-        "HTTP_USER_AGENT" => "HTTP_USER_AGENT",
-        "QUERY_STRING" => "QUERY_STRING",
-        "REMOTE_ADDR" => "REMOTE_ADDR",
-        "REMOTE_HOST" => "REMOTE_HOST",
-        "REMOTE_USER" => "REMOTE_USER",
-        "SERVER_NAME" => "SERVER_NAME",
-        "SERVER_PORT" => "SERVER_PORT",
-        "SERVER_PROTOCOL" => "SERVER_PROTOCOL",
-        "SERVER_SOFTWARE" => "SERVER_SOFTWARE"
-      }
-      optimized_downcaser.call(env)
-    end
-  end
-end