diff --git a/.rubocop.yml b/.rubocop.yml
index a07c861..0afec5c 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,4 +1,4 @@
-require:
+plugins:
   - rubocop-rspec
   - rubocop-rake
 
diff --git a/.ruby-version b/.ruby-version
index ff365e0..4d9d11c 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.1.3
+3.4.2
diff --git a/Gemfile b/Gemfile
index d98db28..ff2841f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,3 +6,21 @@ git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 
 # Specify your gem's dependencies in graph_attack.gemspec
 gemspec
+
+# Development tasks runner.
+gem 'rake', '~> 13.0'
+
+# Testing framework.
+gem 'rspec', '~> 3.0'
+
+# CircleCI dependency to store spec results.
+gem 'rspec_junit_formatter', '~> 0.3'
+
+# Ruby code linter.
+gem 'rubocop', '~> 1.74.0'
+
+# RSpec extension for RuboCop.
+gem 'rubocop-rspec', '~> 3.5.0'
+
+# Rake extension for RuboCop
+gem 'rubocop-rake', '~> 0.7.1'
diff --git a/graph_attack.gemspec b/graph_attack.gemspec
index fd6de2b..22427a6 100644
--- a/graph_attack.gemspec
+++ b/graph_attack.gemspec
@@ -30,25 +30,4 @@ Gem::Specification.new do |spec|
 
   # A Redis-backed rate limiter.
   spec.add_dependency 'ratelimit', '>= 1.0.4'
-
-  # Loads local dependencies.
-  spec.add_development_dependency 'bundler', '~> 2.0'
-
-  # Development tasks runner.
-  spec.add_development_dependency 'rake', '~> 13.0'
-
-  # Testing framework.
-  spec.add_development_dependency 'rspec', '~> 3.0'
-
-  # CircleCI dependency to store spec results.
-  spec.add_development_dependency 'rspec_junit_formatter', '~> 0.3'
-
-  # Ruby code linter.
-  spec.add_development_dependency 'rubocop', '~> 1.56.0'
-
-  # RSpec extension for RuboCop.
-  spec.add_development_dependency 'rubocop-rspec', '~> 2.23.0'
-
-  # Rake extension for RuboCop
-  spec.add_development_dependency 'rubocop-rake', '~> 0.6.0'
 end