diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 9153791a038..c9c9e312414 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -46,7 +46,7 @@ jobs:
       matrix:
         include:
           - gemfile: Gemfile
-            ruby: 3.4
+            ruby: head
           - gemfile: Gemfile
             ruby: 2.7 # lowest supported version
           - gemfile: gemfiles/rails_7.0.gemfile
diff --git a/Gemfile b/Gemfile
index 69aca9d35af..5d534650141 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,7 +7,6 @@ gem 'bootsnap' # required by the Rails apps generated in tests
 gem 'stackprof', platform: :ruby
 gem 'pry'
 gem 'pry-stack_explorer', platform: :ruby
-gem 'pry-byebug'
 
 if RUBY_VERSION >= "3.0"
   gem "libev_scheduler"
diff --git a/graphql.gemspec b/graphql.gemspec
index 8d6abf35e5a..abb03cd8497 100644
--- a/graphql.gemspec
+++ b/graphql.gemspec
@@ -38,6 +38,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "minitest"
   s.add_development_dependency "minitest-focus"
   s.add_development_dependency "minitest-reporters"
+  s.add_development_dependency "ostruct"
   s.add_development_dependency "rake"
   s.add_development_dependency 'rake-compiler'
   s.add_development_dependency "rubocop"
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index f454eb341d6..c6b55790a5b 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -44,7 +44,6 @@
 
 require "rake"
 require "graphql/rake_task"
-require "benchmark"
 require "pry"
 require "minitest/autorun"
 require "minitest/focus"
diff --git a/spec/support/rubocop_test_helpers.rb b/spec/support/rubocop_test_helpers.rb
index 001e402890e..09086809958 100644
--- a/spec/support/rubocop_test_helpers.rb
+++ b/spec/support/rubocop_test_helpers.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+require "yaml"
 
 module RubocopTestHelpers
   def run_rubocop_on(fixture_path, autocorrect: false)