diff --git a/.rubocop.yml b/.rubocop.yml
index 4f5988a..74860c7 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -8,12 +8,11 @@ Style/Documentation:
 Style/FrozenStringLiteralComment:
   Enabled: false
 
-Metrics/LineLength:
+Layout/LineLength:
   Max: 120
-  IgnoreCopDirectives: true
 
 Metrics/BlockLength:
-  ExcludedMethods:
+  AllowedMethods:
     - configure
     - context
     - define
diff --git a/Gemfile b/Gemfile
index b73a005..94db4f2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,3 +2,12 @@ source 'https://rubygems.org'
 
 # Specify your gem's dependencies in bmt-ruby.gemspec
 gemspec
+
+group :development do
+  gem 'bundler', require: false
+  gem 'pry', require: false
+  gem 'rake', require: false
+  gem 'rspec', require: false
+  gem 'rubocop', require: false
+  gem 'rubocop-performance', require: false
+end
diff --git a/bmt.gemspec b/bmt.gemspec
index edac891..b33a90e 100644
--- a/bmt.gemspec
+++ b/bmt.gemspec
@@ -16,12 +16,6 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
   spec.required_ruby_version = '>= 3.1'
 
-  spec.add_development_dependency 'bundler', '~> 2.1'
-  spec.add_development_dependency 'pry', '~> 0.11'
-  spec.add_development_dependency 'rake', '~> 12.3'
-  spec.add_development_dependency 'rspec', '~> 3.6'
-  spec.add_development_dependency 'rubocop', '1.65'
-
   spec.metadata = {
     'homepage_uri' => 'https://github.com/bugcrowd/bmt-ruby',
     'changelog_uri' => 'https://github.com/bugcrowd/bmt-ruby/blob/main/CHANGELOG.md',
diff --git a/lib/bmt.rb b/lib/bmt.rb
index 00d9183..6b69451 100644
--- a/lib/bmt.rb
+++ b/lib/bmt.rb
@@ -43,7 +43,7 @@ def methodology_keys(version: current_version)
       DATA_DIR.join(version, 'methodologies').entries
               .map(&:basename)
               .map(&:to_s)
-              .select { |dirname| dirname =~ /json/ }
+              .grep(/json/)
               .map { |filepath| File.basename(filepath, File.extname(filepath)) }
   end
 
@@ -67,6 +67,6 @@ def json_dir_names
     DATA_DIR.entries
             .map(&:basename)
             .map(&:to_s)
-            .select { |dirname| dirname =~ /^[0-9]+\.[0-9]/ }.sort
+            .grep(/^[0-9]+\.[0-9]/).sort
   end
 end
diff --git a/spec/bmt/step_spec.rb b/spec/bmt/step_spec.rb
index c147a7e..71f96d6 100644
--- a/spec/bmt/step_spec.rb
+++ b/spec/bmt/step_spec.rb
@@ -48,8 +48,6 @@
   end
 
   context 'with an executive_summary step type' do
-    let(:attributes) { methodology_json.dig('content', 'steps', 2) }
-
     subject do
       described_class.new(
         methodology:,
@@ -57,6 +55,8 @@
       )
     end
 
+    let(:attributes) { methodology_json.dig('content', 'steps', 2) }
+
     it 'returns the correct type' do
       expect(subject.type).to eq 'executive_summary'
     end
diff --git a/spec/bmt_spec.rb b/spec/bmt_spec.rb
index 9dde979..bc14f6b 100644
--- a/spec/bmt_spec.rb
+++ b/spec/bmt_spec.rb
@@ -5,7 +5,7 @@
     subject { described_class.versions }
 
     it 'return all of the versions in the filesystem in reverse semver order' do
-      is_expected.to eq(['2.1', '1.0'])
+      expect(subject).to eq(['2.1', '1.0'])
     end
   end
 
@@ -13,7 +13,7 @@
     subject { described_class.current_version }
 
     it 'return the most recent version number for the vrt' do
-      is_expected.to eq('2.1')
+      expect(subject).to eq('2.1')
     end
   end
 
@@ -22,7 +22,7 @@
       subject { described_class.methodology_keys }
 
       it 'returns methodologies for the latest version' do
-        is_expected.to match_array(%w[website-testing outback-animal-testing])
+        expect(subject).to match_array(%w[website-testing outback-animal-testing])
       end
     end
 
@@ -30,7 +30,7 @@
       subject { described_class.methodology_keys(version: '1.0') }
 
       it 'returns methodologies for the specified version' do
-        is_expected.to match_array(['website-testing'])
+        expect(subject).to match_array(['website-testing'])
       end
     end
   end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index ab7bee0..aaeb1ad 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -6,7 +6,7 @@
     c.syntax = :expect
   end
 
-  config.before(:each) do
+  config.before do
     # The following adds a new, test-only BMT versions
     stub_const('BMT::DATA_DIR', Pathname.new('spec/sample'))
   end