diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 062b35dd..94f73e7f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -28,6 +28,7 @@ jobs:
           - 3.2
           - 3.3
           - 3.4
+          - 4.0
           - jruby-9
           - truffleruby
     steps:
diff --git a/Appraisals b/Appraisals
index 0734dbe6..8ccf82cb 100644
--- a/Appraisals
+++ b/Appraisals
@@ -34,6 +34,7 @@ appraise 'rails-6.1' do
   gem 'rails', '~> 6.1.0'
   gem 'rspec-rails', '~> 5.0'
   gem 'sqlite3', '~> 1', platform: :ruby
+  gem 'benchmark'
 end
 
 # Rails 7.0 require Ruby > 2.7