diff --git a/.rubocop.yml b/.rubocop.yml
new file mode 100644
index 0000000..ab03e96
--- /dev/null
+++ b/.rubocop.yml
@@ -0,0 +1,21 @@
+inherit_gem:
+  betterlint:
+    - config/default.yml
+
+inherit_mode:
+  merge:
+    - Exclude
+
+AllCops:
+  TargetRubyVersion: 3.0
+  NewCops: enable
+
+Rails/EnvironmentVariableAccess:
+  Enabled: false
+
+RSpec/IndexedLet:
+  Enabled: false
+
+Style/FrozenStringLiteralComment:
+  Exclude:
+    - 'gemfiles/*'
diff --git a/.ruby-version b/.ruby-version
new file mode 100644
index 0000000..ff365e0
--- /dev/null
+++ b/.ruby-version
@@ -0,0 +1 @@
+3.1.3
diff --git a/Appraisals b/Appraisals
index fa93d7e..2681b48 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 appraise 'rspec-3.9' do
   gem 'rspec', '~> 3.9.0'
 end
diff --git a/Gemfile b/Gemfile
index 5d6c9b8..60b3130 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,10 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
-# Specify your gem's dependencies in rspec-fortify.gemspec
 gemspec
+
+gem 'appraisal'
+gem 'betterlint'
+gem 'rspec'
+gem 'tty-command'
diff --git a/Guardfile b/Guardfile
index e6c7593..c9fe0d1 100644
--- a/Guardfile
+++ b/Guardfile
@@ -1,5 +1,7 @@
-guard 'rspec', :version => 2, :cli => '-c -f d' do
+# frozen_string_literal: true
+
+guard 'rspec', version: 2, cli: '-c -f d' do
   watch(%r{^spec/.+_spec\.rb$})
   watch(%r{^lib/(.+)\.rb$})     { |m| "spec/lib/#{m[1]}_spec.rb" }
-  watch('spec/spec_helper.rb')  { "spec" }
+  watch('spec/spec_helper.rb')  { 'spec' }
 end
diff --git a/Rakefile b/Rakefile
old mode 100644
new mode 100755
index 37c6ddb..8b37144
--- a/Rakefile
+++ b/Rakefile
@@ -1,12 +1,11 @@
 #!/usr/bin/env rake
+# frozen_string_literal: true
+
 require 'bundler/setup'
-require "bundler/gem_tasks"
+require 'bundler/gem_tasks'
 
-begin
-  require 'rspec/core/rake_task'
+require 'rspec/core/rake_task'
 
-  RSpec::Core::RakeTask.new(:spec)
+RSpec::Core::RakeTask.new(:spec)
 
-  task :default => :spec
-rescue LoadError
-end
+task default: :spec
diff --git a/gemfiles/rspec_3.10.gemfile b/gemfiles/rspec_3.10.gemfile
index 1c4ab36..fc4a94b 100644
--- a/gemfiles/rspec_3.10.gemfile
+++ b/gemfiles/rspec_3.10.gemfile
@@ -1,7 +1,12 @@
+# frozen_string_literal: true
+
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
 
+gem "appraisal"
+gem "betterlint"
 gem "rspec", "~> 3.10.0"
+gem "tty-command"
 
 gemspec path: "../"
diff --git a/gemfiles/rspec_3.10.gemfile.lock b/gemfiles/rspec_3.10.gemfile.lock
index 7c27bb8..975a5b4 100644
--- a/gemfiles/rspec_3.10.gemfile.lock
+++ b/gemfiles/rspec_3.10.gemfile.lock
@@ -7,14 +7,51 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
+    activesupport (7.1.3.2)
+      base64
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      connection_pool (>= 2.2.5)
+      drb
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      mutex_m
+      tzinfo (~> 2.0)
     appraisal (2.5.0)
       bundler
       rake
       thor (>= 0.14.0)
+    ast (2.4.2)
+    base64 (0.2.0)
+    betterlint (1.10.1)
+      rubocop (~> 1.62.0)
+      rubocop-performance (~> 1.21.0)
+      rubocop-rails (~> 2.24.0)
+      rubocop-rake (~> 0.6.0)
+      rubocop-rspec (~> 2.28.0)
+    bigdecimal (3.1.7)
+    concurrent-ruby (1.2.3)
+    connection_pool (2.4.1)
     diff-lcs (1.5.1)
+    drb (2.2.1)
+    i18n (1.14.4)
+      concurrent-ruby (~> 1.0)
+    json (2.7.2)
+    language_server-protocol (3.17.0.3)
+    minitest (5.22.3)
+    mutex_m (0.2.0)
+    parallel (1.24.0)
+    parser (3.3.1.0)
+      ast (~> 2.4.1)
+      racc
     pastel (0.8.0)
       tty-color (~> 0.5)
+    racc (1.7.3)
+    rack (3.0.10)
+    rainbow (3.1.1)
     rake (13.2.1)
+    regexp_parser (2.9.0)
+    rexml (3.2.6)
     rspec (3.10.0)
       rspec-core (~> 3.10.0)
       rspec-expectations (~> 3.10.0)
@@ -28,10 +65,48 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.10.0)
     rspec-support (3.10.3)
+    rubocop (1.62.1)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
+      parallel (~> 1.10)
+      parser (>= 3.3.0.2)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.31.3)
+      parser (>= 3.3.1.0)
+    rubocop-capybara (2.20.0)
+      rubocop (~> 1.41)
+    rubocop-factory_bot (2.25.1)
+      rubocop (~> 1.41)
+    rubocop-performance (1.21.0)
+      rubocop (>= 1.48.1, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+    rubocop-rails (2.24.1)
+      activesupport (>= 4.2.0)
+      rack (>= 1.1)
+      rubocop (>= 1.33.0, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+    rubocop-rake (0.6.0)
+      rubocop (~> 1.0)
+    rubocop-rspec (2.28.0)
+      rubocop (~> 1.40)
+      rubocop-capybara (~> 2.17)
+      rubocop-factory_bot (~> 2.22)
+      rubocop-rspec_rails (~> 2.28)
+    rubocop-rspec_rails (2.28.3)
+      rubocop (~> 1.40)
+    ruby-progressbar (1.13.0)
     thor (1.3.1)
     tty-color (0.6.0)
     tty-command (0.10.1)
       pastel (~> 0.8)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    unicode-display_width (2.5.0)
 
 PLATFORMS
   arm64-darwin-22
@@ -39,6 +114,7 @@ PLATFORMS
 
 DEPENDENCIES
   appraisal
+  betterlint
   rspec (~> 3.10.0)
   rspec-fortify!
   tty-command
diff --git a/gemfiles/rspec_3.11.gemfile b/gemfiles/rspec_3.11.gemfile
index 61f07c2..7e43058 100644
--- a/gemfiles/rspec_3.11.gemfile
+++ b/gemfiles/rspec_3.11.gemfile
@@ -1,7 +1,12 @@
+# frozen_string_literal: true
+
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
 
+gem "appraisal"
+gem "betterlint"
 gem "rspec", "~> 3.11.0"
+gem "tty-command"
 
 gemspec path: "../"
diff --git a/gemfiles/rspec_3.11.gemfile.lock b/gemfiles/rspec_3.11.gemfile.lock
index 8327ee8..6348a72 100644
--- a/gemfiles/rspec_3.11.gemfile.lock
+++ b/gemfiles/rspec_3.11.gemfile.lock
@@ -7,14 +7,51 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
+    activesupport (7.1.3.2)
+      base64
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      connection_pool (>= 2.2.5)
+      drb
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      mutex_m
+      tzinfo (~> 2.0)
     appraisal (2.5.0)
       bundler
       rake
       thor (>= 0.14.0)
+    ast (2.4.2)
+    base64 (0.2.0)
+    betterlint (1.10.1)
+      rubocop (~> 1.62.0)
+      rubocop-performance (~> 1.21.0)
+      rubocop-rails (~> 2.24.0)
+      rubocop-rake (~> 0.6.0)
+      rubocop-rspec (~> 2.28.0)
+    bigdecimal (3.1.7)
+    concurrent-ruby (1.2.3)
+    connection_pool (2.4.1)
     diff-lcs (1.5.1)
+    drb (2.2.1)
+    i18n (1.14.4)
+      concurrent-ruby (~> 1.0)
+    json (2.7.2)
+    language_server-protocol (3.17.0.3)
+    minitest (5.22.3)
+    mutex_m (0.2.0)
+    parallel (1.24.0)
+    parser (3.3.1.0)
+      ast (~> 2.4.1)
+      racc
     pastel (0.8.0)
       tty-color (~> 0.5)
+    racc (1.7.3)
+    rack (3.0.10)
+    rainbow (3.1.1)
     rake (13.2.1)
+    regexp_parser (2.9.0)
+    rexml (3.2.6)
     rspec (3.11.0)
       rspec-core (~> 3.11.0)
       rspec-expectations (~> 3.11.0)
@@ -28,10 +65,48 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.11.0)
     rspec-support (3.11.1)
+    rubocop (1.62.1)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
+      parallel (~> 1.10)
+      parser (>= 3.3.0.2)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.31.3)
+      parser (>= 3.3.1.0)
+    rubocop-capybara (2.20.0)
+      rubocop (~> 1.41)
+    rubocop-factory_bot (2.25.1)
+      rubocop (~> 1.41)
+    rubocop-performance (1.21.0)
+      rubocop (>= 1.48.1, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+    rubocop-rails (2.24.1)
+      activesupport (>= 4.2.0)
+      rack (>= 1.1)
+      rubocop (>= 1.33.0, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+    rubocop-rake (0.6.0)
+      rubocop (~> 1.0)
+    rubocop-rspec (2.28.0)
+      rubocop (~> 1.40)
+      rubocop-capybara (~> 2.17)
+      rubocop-factory_bot (~> 2.22)
+      rubocop-rspec_rails (~> 2.28)
+    rubocop-rspec_rails (2.28.3)
+      rubocop (~> 1.40)
+    ruby-progressbar (1.13.0)
     thor (1.3.1)
     tty-color (0.6.0)
     tty-command (0.10.1)
       pastel (~> 0.8)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    unicode-display_width (2.5.0)
 
 PLATFORMS
   arm64-darwin-22
@@ -39,6 +114,7 @@ PLATFORMS
 
 DEPENDENCIES
   appraisal
+  betterlint
   rspec (~> 3.11.0)
   rspec-fortify!
   tty-command
diff --git a/gemfiles/rspec_3.12.gemfile b/gemfiles/rspec_3.12.gemfile
index 561a9cd..54cce98 100644
--- a/gemfiles/rspec_3.12.gemfile
+++ b/gemfiles/rspec_3.12.gemfile
@@ -1,7 +1,12 @@
+# frozen_string_literal: true
+
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
 
+gem "appraisal"
+gem "betterlint"
 gem "rspec", "~> 3.12.0"
+gem "tty-command"
 
 gemspec path: "../"
diff --git a/gemfiles/rspec_3.12.gemfile.lock b/gemfiles/rspec_3.12.gemfile.lock
index 3d4151c..68eaf1b 100644
--- a/gemfiles/rspec_3.12.gemfile.lock
+++ b/gemfiles/rspec_3.12.gemfile.lock
@@ -7,14 +7,51 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
+    activesupport (7.1.3.2)
+      base64
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      connection_pool (>= 2.2.5)
+      drb
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      mutex_m
+      tzinfo (~> 2.0)
     appraisal (2.5.0)
       bundler
       rake
       thor (>= 0.14.0)
+    ast (2.4.2)
+    base64 (0.2.0)
+    betterlint (1.10.1)
+      rubocop (~> 1.62.0)
+      rubocop-performance (~> 1.21.0)
+      rubocop-rails (~> 2.24.0)
+      rubocop-rake (~> 0.6.0)
+      rubocop-rspec (~> 2.28.0)
+    bigdecimal (3.1.7)
+    concurrent-ruby (1.2.3)
+    connection_pool (2.4.1)
     diff-lcs (1.5.1)
+    drb (2.2.1)
+    i18n (1.14.4)
+      concurrent-ruby (~> 1.0)
+    json (2.7.2)
+    language_server-protocol (3.17.0.3)
+    minitest (5.22.3)
+    mutex_m (0.2.0)
+    parallel (1.24.0)
+    parser (3.3.1.0)
+      ast (~> 2.4.1)
+      racc
     pastel (0.8.0)
       tty-color (~> 0.5)
+    racc (1.7.3)
+    rack (3.0.10)
+    rainbow (3.1.1)
     rake (13.2.1)
+    regexp_parser (2.9.0)
+    rexml (3.2.6)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)
@@ -28,10 +65,48 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.12.0)
     rspec-support (3.12.2)
+    rubocop (1.62.1)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
+      parallel (~> 1.10)
+      parser (>= 3.3.0.2)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.31.3)
+      parser (>= 3.3.1.0)
+    rubocop-capybara (2.20.0)
+      rubocop (~> 1.41)
+    rubocop-factory_bot (2.25.1)
+      rubocop (~> 1.41)
+    rubocop-performance (1.21.0)
+      rubocop (>= 1.48.1, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+    rubocop-rails (2.24.1)
+      activesupport (>= 4.2.0)
+      rack (>= 1.1)
+      rubocop (>= 1.33.0, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+    rubocop-rake (0.6.0)
+      rubocop (~> 1.0)
+    rubocop-rspec (2.28.0)
+      rubocop (~> 1.40)
+      rubocop-capybara (~> 2.17)
+      rubocop-factory_bot (~> 2.22)
+      rubocop-rspec_rails (~> 2.28)
+    rubocop-rspec_rails (2.28.3)
+      rubocop (~> 1.40)
+    ruby-progressbar (1.13.0)
     thor (1.3.1)
     tty-color (0.6.0)
     tty-command (0.10.1)
       pastel (~> 0.8)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    unicode-display_width (2.5.0)
 
 PLATFORMS
   arm64-darwin-22
@@ -39,6 +114,7 @@ PLATFORMS
 
 DEPENDENCIES
   appraisal
+  betterlint
   rspec (~> 3.12.0)
   rspec-fortify!
   tty-command
diff --git a/gemfiles/rspec_3.13.gemfile b/gemfiles/rspec_3.13.gemfile
index be287d5..7ec1349 100644
--- a/gemfiles/rspec_3.13.gemfile
+++ b/gemfiles/rspec_3.13.gemfile
@@ -1,7 +1,12 @@
+# frozen_string_literal: true
+
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
 
+gem "appraisal"
+gem "betterlint"
 gem "rspec", "~> 3.13.0"
+gem "tty-command"
 
 gemspec path: "../"
diff --git a/gemfiles/rspec_3.13.gemfile.lock b/gemfiles/rspec_3.13.gemfile.lock
index c873fb0..31115d9 100644
--- a/gemfiles/rspec_3.13.gemfile.lock
+++ b/gemfiles/rspec_3.13.gemfile.lock
@@ -7,14 +7,51 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
+    activesupport (7.1.3.2)
+      base64
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      connection_pool (>= 2.2.5)
+      drb
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      mutex_m
+      tzinfo (~> 2.0)
     appraisal (2.5.0)
       bundler
       rake
       thor (>= 0.14.0)
+    ast (2.4.2)
+    base64 (0.2.0)
+    betterlint (1.10.1)
+      rubocop (~> 1.62.0)
+      rubocop-performance (~> 1.21.0)
+      rubocop-rails (~> 2.24.0)
+      rubocop-rake (~> 0.6.0)
+      rubocop-rspec (~> 2.28.0)
+    bigdecimal (3.1.7)
+    concurrent-ruby (1.2.3)
+    connection_pool (2.4.1)
     diff-lcs (1.5.1)
+    drb (2.2.1)
+    i18n (1.14.4)
+      concurrent-ruby (~> 1.0)
+    json (2.7.2)
+    language_server-protocol (3.17.0.3)
+    minitest (5.22.3)
+    mutex_m (0.2.0)
+    parallel (1.24.0)
+    parser (3.3.1.0)
+      ast (~> 2.4.1)
+      racc
     pastel (0.8.0)
       tty-color (~> 0.5)
+    racc (1.7.3)
+    rack (3.0.10)
+    rainbow (3.1.1)
     rake (13.2.1)
+    regexp_parser (2.9.0)
+    rexml (3.2.6)
     rspec (3.13.0)
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)
@@ -28,10 +65,48 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
     rspec-support (3.13.1)
+    rubocop (1.62.1)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
+      parallel (~> 1.10)
+      parser (>= 3.3.0.2)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.31.3)
+      parser (>= 3.3.1.0)
+    rubocop-capybara (2.20.0)
+      rubocop (~> 1.41)
+    rubocop-factory_bot (2.25.1)
+      rubocop (~> 1.41)
+    rubocop-performance (1.21.0)
+      rubocop (>= 1.48.1, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+    rubocop-rails (2.24.1)
+      activesupport (>= 4.2.0)
+      rack (>= 1.1)
+      rubocop (>= 1.33.0, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+    rubocop-rake (0.6.0)
+      rubocop (~> 1.0)
+    rubocop-rspec (2.28.0)
+      rubocop (~> 1.40)
+      rubocop-capybara (~> 2.17)
+      rubocop-factory_bot (~> 2.22)
+      rubocop-rspec_rails (~> 2.28)
+    rubocop-rspec_rails (2.28.3)
+      rubocop (~> 1.40)
+    ruby-progressbar (1.13.0)
     thor (1.3.1)
     tty-color (0.6.0)
     tty-command (0.10.1)
       pastel (~> 0.8)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    unicode-display_width (2.5.0)
 
 PLATFORMS
   arm64-darwin-22
@@ -39,6 +114,7 @@ PLATFORMS
 
 DEPENDENCIES
   appraisal
+  betterlint
   rspec (~> 3.13.0)
   rspec-fortify!
   tty-command
diff --git a/gemfiles/rspec_3.9.gemfile b/gemfiles/rspec_3.9.gemfile
index 4212c75..5915605 100644
--- a/gemfiles/rspec_3.9.gemfile
+++ b/gemfiles/rspec_3.9.gemfile
@@ -1,7 +1,12 @@
+# frozen_string_literal: true
+
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
 
+gem "appraisal"
+gem "betterlint"
 gem "rspec", "~> 3.9.0"
+gem "tty-command"
 
 gemspec path: "../"
diff --git a/gemfiles/rspec_3.9.gemfile.lock b/gemfiles/rspec_3.9.gemfile.lock
index fd326d3..a6cc3e4 100644
--- a/gemfiles/rspec_3.9.gemfile.lock
+++ b/gemfiles/rspec_3.9.gemfile.lock
@@ -7,14 +7,51 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
+    activesupport (7.1.3.2)
+      base64
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      connection_pool (>= 2.2.5)
+      drb
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      mutex_m
+      tzinfo (~> 2.0)
     appraisal (2.5.0)
       bundler
       rake
       thor (>= 0.14.0)
+    ast (2.4.2)
+    base64 (0.2.0)
+    betterlint (1.10.1)
+      rubocop (~> 1.62.0)
+      rubocop-performance (~> 1.21.0)
+      rubocop-rails (~> 2.24.0)
+      rubocop-rake (~> 0.6.0)
+      rubocop-rspec (~> 2.28.0)
+    bigdecimal (3.1.7)
+    concurrent-ruby (1.2.3)
+    connection_pool (2.4.1)
     diff-lcs (1.5.1)
+    drb (2.2.1)
+    i18n (1.14.4)
+      concurrent-ruby (~> 1.0)
+    json (2.7.2)
+    language_server-protocol (3.17.0.3)
+    minitest (5.22.3)
+    mutex_m (0.2.0)
+    parallel (1.24.0)
+    parser (3.3.1.0)
+      ast (~> 2.4.1)
+      racc
     pastel (0.8.0)
       tty-color (~> 0.5)
+    racc (1.7.3)
+    rack (3.0.10)
+    rainbow (3.1.1)
     rake (13.2.1)
+    regexp_parser (2.9.0)
+    rexml (3.2.6)
     rspec (3.9.0)
       rspec-core (~> 3.9.0)
       rspec-expectations (~> 3.9.0)
@@ -28,10 +65,48 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.9.0)
     rspec-support (3.9.4)
+    rubocop (1.62.1)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
+      parallel (~> 1.10)
+      parser (>= 3.3.0.2)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.31.3)
+      parser (>= 3.3.1.0)
+    rubocop-capybara (2.20.0)
+      rubocop (~> 1.41)
+    rubocop-factory_bot (2.25.1)
+      rubocop (~> 1.41)
+    rubocop-performance (1.21.0)
+      rubocop (>= 1.48.1, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+    rubocop-rails (2.24.1)
+      activesupport (>= 4.2.0)
+      rack (>= 1.1)
+      rubocop (>= 1.33.0, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+    rubocop-rake (0.6.0)
+      rubocop (~> 1.0)
+    rubocop-rspec (2.28.0)
+      rubocop (~> 1.40)
+      rubocop-capybara (~> 2.17)
+      rubocop-factory_bot (~> 2.22)
+      rubocop-rspec_rails (~> 2.28)
+    rubocop-rspec_rails (2.28.3)
+      rubocop (~> 1.40)
+    ruby-progressbar (1.13.0)
     thor (1.3.1)
     tty-color (0.6.0)
     tty-command (0.10.1)
       pastel (~> 0.8)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    unicode-display_width (2.5.0)
 
 PLATFORMS
   arm64-darwin-22
@@ -39,6 +114,7 @@ PLATFORMS
 
 DEPENDENCIES
   appraisal
+  betterlint
   rspec (~> 3.9.0)
   rspec-fortify!
   tty-command
diff --git a/lib/rspec/fortify.rb b/lib/rspec/fortify.rb
index 2f4f7cf..1c628b2 100644
--- a/lib/rspec/fortify.rb
+++ b/lib/rspec/fortify.rb
@@ -1,52 +1,52 @@
+# frozen_string_literal: true
+
 require 'rspec/core'
 require 'rspec/fortify/version'
 require 'rspec_ext/rspec_ext'
 
 module RSpec
   class Fortify
-    def self.setup
+    def self.setup # rubocop:disable Metrics/AbcSize
       RSpec.configure do |config|
-        config.add_setting :clear_lets_on_failure, :default => true
-        config.add_setting :default_retry_count, :default => 1
-        config.add_setting :default_sleep_interval, :default => 0
-        config.add_setting :display_try_failure_messages, :default => true
-        config.add_setting :exponential_backoff, :default => false
+        config.add_setting :clear_lets_on_failure, default: true
+        config.add_setting :default_retry_count, default: 1
+        config.add_setting :default_sleep_interval, default: 0
+        config.add_setting :display_try_failure_messages, default: true
+        config.add_setting :exponential_backoff, default: false
         config.add_setting :retry_on_failure, default: main? || pr?
         config.add_setting :retry_on_failure_count, default: 2
         config.add_setting :retry_on_success, default: pr? && changed_specs.size < 30
         config.add_setting :retry_on_success_count, default: 10
-        config.add_setting :verbose_retry, :default => true
+        config.add_setting :verbose_retry, default: true
 
         # retry based on example metadata
-        config.add_setting :retry_count_condition, :default => ->(_) { nil }
+        config.add_setting :retry_count_condition, default: ->(_) {}
 
         # If a list of exceptions is provided and 'retry' > 1, we only retry if
         # the exception that was raised by the example is NOT in that list. Otherwise
         # we ignore the 'retry' value and fail immediately.
         #
         # If no list of exceptions is provided and 'retry' > 1, we always retry.
-        config.add_setting :exceptions_to_hard_fail, :default => []
+        config.add_setting :exceptions_to_hard_fail, default: []
 
         # If a list of exceptions is provided and 'retry' > 1, we only retry if
         # the exception that was raised by the example is in that list. Otherwise
         # we ignore the 'retry' value and fail immediately.
         #
         # If no list of exceptions is provided and 'retry' > 1, we always retry.
-        config.add_setting :exceptions_to_retry, :default => []
+        config.add_setting :exceptions_to_retry, default: []
 
         # Callback between retries
-        config.add_setting :retry_callback, :default => nil
+        config.add_setting :retry_callback, default: nil
 
-        config.around :each do |example|
-          example.run_with_retry
-        end
+        config.around :each, &:run_with_retry
       end
     end
 
     attr_reader :context, :ex
 
-    def initialize(ex, opts = {})
-      @ex = ex
+    def initialize(example, opts = {})
+      @ex = example
       @ex.metadata.merge!(opts)
       current_example.attempts ||= 0
     end
@@ -55,7 +55,7 @@ def current_example
       @current_example ||= RSpec.current_example
     end
 
-    def retry_count
+    def retry_count # rubocop:disable Metrics/AbcSize
       if retry_on_success?
         RSpec.configuration.retry_on_success_count
       elsif retry_on_failure?
@@ -82,28 +82,30 @@ def attempts=(val)
     end
 
     def clear_lets
-      !ex.metadata[:clear_lets_on_failure].nil? ?
-          ex.metadata[:clear_lets_on_failure] :
-          RSpec.configuration.clear_lets_on_failure
+      if ex.metadata[:clear_lets_on_failure].nil?
+        RSpec.configuration.clear_lets_on_failure
+      else
+        ex.metadata[:clear_lets_on_failure]
+      end
     end
 
     def sleep_interval
       if ex.metadata[:exponential_backoff]
-          2**(current_example.attempts-1) * ex.metadata[:retry_wait]
+        (2**(current_example.attempts - 1)) * ex.metadata[:retry_wait]
       else
-          ex.metadata[:retry_wait] ||
-              RSpec.configuration.default_sleep_interval
+        ex.metadata[:retry_wait] ||
+          RSpec.configuration.default_sleep_interval
       end
     end
 
     def exceptions_to_hard_fail
       ex.metadata[:exceptions_to_hard_fail] ||
-          RSpec.configuration.exceptions_to_hard_fail
+        RSpec.configuration.exceptions_to_hard_fail
     end
 
     def exceptions_to_retry
       ex.metadata[:exceptions_to_retry] ||
-          RSpec.configuration.exceptions_to_retry
+        RSpec.configuration.exceptions_to_retry
     end
 
     def verbose_retry?
@@ -114,7 +116,7 @@ def display_try_failure_messages?
       RSpec.configuration.display_try_failure_messages?
     end
 
-    def run
+    def run # rubocop:disable Metrics/PerceivedComplexity, Metrics/AbcSize, Metrics/CyclomaticComplexity
       loop do
         RSpec.configuration.formatters.each { |f| f.retry(ex) if f.respond_to? :retry } if attempts.positive?
 
@@ -142,9 +144,7 @@ def run
           break
         end
 
-        if exceptions_to_retry.any? && ex.exception && !exception_exists_in?(exceptions_to_retry, ex.exception)
-          break
-        end
+        break if exceptions_to_retry.any? && ex.exception && !exception_exists_in?(exceptions_to_retry, ex.exception)
 
         if verbose_retry? && display_try_failure_messages? && retry_on_failure? && (attempts != retry_count)
           exception_strings =
@@ -172,21 +172,21 @@ def run
 
     # borrowed from ActiveSupport::Inflector
     def ordinalize(number)
-      if (11..13).include?(number.to_i % 100)
+      if (11..13).cover?(number.to_i % 100)
         "#{number}th"
       else
         case number.to_i % 10
-        when 1; "#{number}st"
-        when 2; "#{number}nd"
-        when 3; "#{number}rd"
-        else    "#{number}th"
+          when 1 then "#{number}st"
+          when 2 then "#{number}nd"
+          when 3 then "#{number}rd"
+          else "#{number}th"
         end
       end
     end
 
     def exception_exists_in?(list, exception)
       list.any? do |exception_klass|
-        exception.is_a?(exception_klass) || exception_klass === exception
+        exception.is_a?(exception_klass) || exception_klass === exception # rubocop:disable Style/CaseEquality
       end
     end
 
@@ -229,7 +229,7 @@ def should_retry?
 end
 
 def cast_to_boolean(value)
-  if value.nil? || %w(false f 0 no n).include?(value.to_s.downcase)
+  if value.nil? || %w(false f 0 no n).include?(value.to_s.downcase) # rubocop:disable Style/IfWithBooleanLiteralBranches
     false
   else
     true
diff --git a/lib/rspec/fortify/formatter.rb b/lib/rspec/fortify/formatter.rb
index 4619398..b956d97 100644
--- a/lib/rspec/fortify/formatter.rb
+++ b/lib/rspec/fortify/formatter.rb
@@ -1,56 +1,65 @@
+# frozen_string_literal: true
+
 require 'rspec/core/formatters/base_text_formatter'
 
-class RSpec::Fortify::Formatter < RSpec::Core::Formatters::BaseTextFormatter
-  RSpec::Core::Formatters.register self, :example_passed
+module RSpec
+  module Fortify
+    class Formatter < RSpec::Core::Formatters::BaseTextFormatter
+      RSpec::Core::Formatters.register self, :example_passed
 
-  def initialize(output)
-    super(output)
-    @tries = Hash.new { |h, k| h[k] = { successes: 0, tries: 0 } }
-  end
+      def initialize(output)
+        super(output)
+        @tries = Hash.new { |h, k| h[k] = { successes: 0, tries: 0 } }
+      end
 
-  def seed(_); end
+      def seed(_); end
 
-  def message(_message); end
+      def message(_message); end
 
-  def close(_); end
+      def close(_); end
 
-  def dump_failures(_); end
+      def dump_failures(_); end
 
-  def dump_pending(_); end
+      def dump_pending(_); end
 
-  def dump_summary(notification)
-    summary = "\nRSpec Fortify Summary:\n"
-    @tries.each do |key, retry_data|
-      next if retry_data[:successes] < 1 || retry_data[:tries] <= 1
-      summary += "\t#{key.location}: #{key.full_description}: passed at attempt #{retry_data[:tries]}\n"
-    end
-    retried = @tries.count { |_, v| v[:tries] > 1  && v[:successes] > 0 }
-    summary += "\n\t#{retried} of #{notification.example_count} tests passed with retries.\n"
-    summary += "\t#{notification.failure_count} tests failed all retries.\n"
-    output.puts summary
-  end
+      def dump_summary(notification) # rubocop:disable Metrics/AbcSize
+        summary = "\nRSpec Fortify Summary:\n"
+        @tries.each do |key, retry_data|
+          next if retry_data[:successes] < 1 || retry_data[:tries] <= 1
 
-  def example_passed(notification)
-    increment_success notification.example
-  end
+          summary += "\t#{key.location}: #{key.full_description}: passed at attempt #{retry_data[:tries]}\n"
+        end
+        retried = @tries.count { |_, v| v[:tries] > 1 && (v[:successes]).positive? }
+        summary += "\n\t#{retried} of #{notification.example_count} tests passed with retries.\n"
+        summary += "\t#{notification.failure_count} tests failed all retries.\n"
+        output.puts summary
+      end
 
-  def retry(example)
-    increment_tries example
-  end
+      def example_passed(notification)
+        increment_success notification.example
+      end
 
-  private
+      def retry(example)
+        increment_tries example
+      end
 
-  def increment_success(example)
-    # debugger
-    previous = @tries[example]
-    @tries[example] = {
-      successes: previous[:successes] + 1, tries: previous[:tries] + 1 }
-  end
+      private
 
-  def increment_tries(example)
-    # debugger
-    previous = @tries[example]
-    @tries[example] = {
-      successes: previous[:successes], tries: previous[:tries] + 1 }
+      def increment_success(example)
+        # debugger
+        previous = @tries[example]
+        @tries[example] = {
+          successes: previous[:successes] + 1, tries: previous[:tries] + 1
+        }
+      end
+
+      def increment_tries(example)
+        # debugger
+        previous = @tries[example]
+        @tries[example] = {
+          successes: previous[:successes], tries: previous[:tries] + 1
+        }
+      end
+    end
   end
 end
diff --git a/lib/rspec/fortify/version.rb b/lib/rspec/fortify/version.rb
index 98694a5..ba39cb4 100644
--- a/lib/rspec/fortify/version.rb
+++ b/lib/rspec/fortify/version.rb
@@ -1,5 +1,7 @@
+# frozen_string_literal: true
+
 module RSpec
   class Fortify
-    VERSION = "1.0.0.pre"
+    VERSION = '1.0.0.pre'
   end
 end
diff --git a/lib/rspec_ext/rspec_ext.rb b/lib/rspec_ext/rspec_ext.rb
index 3fd0fc3..35b7b95 100644
--- a/lib/rspec_ext/rspec_ext.rb
+++ b/lib/rspec_ext/rspec_ext.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RSpec
   module Core
     class Example
diff --git a/rspec-fortify.gemspec b/rspec-fortify.gemspec
index ee82785..6fe2e8a 100644
--- a/rspec-fortify.gemspec
+++ b/rspec-fortify.gemspec
@@ -1,22 +1,22 @@
-# -*- encoding: utf-8 -*-
-require File.expand_path('../lib/rspec/fortify/version', __FILE__)
+# frozen_string_literal: true
 
-Gem::Specification.new do |gem|
-  gem.authors       = ['Yusuke Mito', 'Michael Glass', 'Devin Burnette']
-  gem.email         = ["devin@betterment.com"]
-  gem.description   = %q{retry intermittently failing rspec examples}
-  gem.summary       = %q{retry intermittently failing rspec examples}
-  gem.homepage      = "https://github.com/Betterment/rspec-fortify"
-  gem.license       = "MIT"
+require 'English'
+require File.expand_path('lib/rspec/fortify/version', __dir__)
 
-  gem.files         = `git ls-files`.split($\)
-  gem.executables   = []
-  gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
-  gem.name          = "rspec-fortify"
-  gem.require_paths = ["lib"]
-  gem.version       = RSpec::Fortify::VERSION
-  gem.add_runtime_dependency(%{rspec-core}, '>3.9')
-  gem.add_development_dependency %q{appraisal}
-  gem.add_development_dependency %q{rspec}
-  gem.add_development_dependency %q{tty-command}
+Gem::Specification.new do |spec|
+  spec.authors       = ['Yusuke Mito', 'Michael Glass', 'Devin Burnette']
+  spec.email         = ['devin@betterment.com']
+  spec.description   = 'retry intermittently failing rspec examples'
+  spec.summary       = 'retry intermittently failing rspec examples'
+  spec.homepage      = 'https://github.com/Betterment/rspec-fortify'
+  spec.license       = 'MIT'
+  spec.metadata['rubygems_mfa_required'] = 'true'
+
+  spec.files         = `git ls-files`.split($OUTPUT_RECORD_SEPARATOR)
+  spec.executables   = []
+  spec.name          = 'rspec-fortify'
+  spec.require_paths = ['lib']
+  spec.version       = RSpec::Fortify::VERSION
+  spec.required_ruby_version = '>= 3.0'
+  spec.add_runtime_dependency 'rspec-core', '>3.9'
 end
diff --git a/spec/fixtures/bad_test.rb b/spec/fixtures/bad_test.rb
index 8d2fb1f..cc2bf6d 100644
--- a/spec/fixtures/bad_test.rb
+++ b/spec/fixtures/bad_test.rb
@@ -1,6 +1,8 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
-RSpec.describe 'Bad Test Example' do
+RSpec.describe 'Bad Test Example' do # rubocop:disable RSpec/FilePath
   let(:foo) { false }
 
   it 'is a bad test' do
diff --git a/spec/fixtures/flaky_test.rb b/spec/fixtures/flaky_test.rb
index 855da0b..73d4cf4 100644
--- a/spec/fixtures/flaky_test.rb
+++ b/spec/fixtures/flaky_test.rb
@@ -1,13 +1,15 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
-RSpec.describe 'Flaky Test Example' do
-  before(:all) do
-    $try_counter = 0
+RSpec.describe 'Flaky Test Example' do # rubocop:disable RSpec/FilePath
+  before(:all) do # rubocop:disable RSpec/BeforeAfterAll
+    $try_counter = 0 # rubocop:disable Style/GlobalVars
   end
 
   it 'fails on the third try' do
-    $try_counter += 1
+    $try_counter += 1 # rubocop:disable Style/GlobalVars
 
-    expect($try_counter).not_to eq(3), "Intentionally failing on the third try"
+    expect($try_counter).not_to eq(3), 'Intentionally failing on the third try' # rubocop:disable Style/GlobalVars
   end
 end
diff --git a/spec/fixtures/good_test.rb b/spec/fixtures/good_test.rb
index ff5cdb7..c8a8e40 100644
--- a/spec/fixtures/good_test.rb
+++ b/spec/fixtures/good_test.rb
@@ -1,6 +1,8 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
-RSpec.describe 'Good Test Example' do
+RSpec.describe 'Good Test Example' do # rubocop:disable RSpec/FilePath
   let(:foo) { true }
 
   it 'is a good test' do
diff --git a/spec/lib/rspec/fortify_spec.rb b/spec/lib/rspec/fortify_spec.rb
index a287f59..6ba1bc5 100644
--- a/spec/lib/rspec/fortify_spec.rb
+++ b/spec/lib/rspec/fortify_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 require 'tty-command'
 
@@ -16,19 +18,19 @@
         end
 
         it 'retries bad test examples the configured failed retry amount' do
-          out, _err = cmd.run!('bundle exec rspec spec/fixtures/bad_test.rb', env:)
+          out, _err = cmd.run!('bundle exec rspec spec/fixtures/bad_test.rb', env: env)
           expect(out).to include('2nd try')
           expect(out).not_to include('10th try')
         end
 
         it 'runs good test examples once' do
-          out, _err = cmd.run!('bundle exec rspec spec/fixtures/good_test.rb', env:)
+          out, _err = cmd.run!('bundle exec rspec spec/fixtures/good_test.rb', env: env)
           expect(out).to include('1st try')
           expect(out).not_to include('2nd try')
         end
 
         it 'runs flaky test examples once' do
-          out, _err = cmd.run!('bundle exec rspec spec/fixtures/flaky_test.rb', env:)
+          out, _err = cmd.run!('bundle exec rspec spec/fixtures/flaky_test.rb', env: env)
           expect(out).to include('1st try')
           expect(out).not_to include('2nd try')
         end
@@ -43,19 +45,19 @@
         end
 
         it 'retries bad test examples the configured failed retry amount' do
-          out, _err = cmd.run!('bundle exec rspec spec/fixtures/bad_test.rb', env:)
+          out, _err = cmd.run!('bundle exec rspec spec/fixtures/bad_test.rb', env: env)
           expect(out).to include('2nd try')
           expect(out).not_to include('10th try')
         end
 
         it 'runs good test examples once' do
-          out, _err = cmd.run!('bundle exec rspec spec/fixtures/good_test.rb', env:)
+          out, _err = cmd.run!('bundle exec rspec spec/fixtures/good_test.rb', env: env)
           expect(out).to include('1st try')
           expect(out).not_to include('2nd try')
         end
 
         it 'runs flaky test examples once' do
-          out, _err = cmd.run!('bundle exec rspec spec/fixtures/flaky_test.rb', env:)
+          out, _err = cmd.run!('bundle exec rspec spec/fixtures/flaky_test.rb', env: env)
           expect(out).to include('1st try')
           expect(out).not_to include('2nd try')
         end
@@ -75,19 +77,19 @@
           end
 
           it 'retries bad test examples the configured failed retry amount' do
-            out, _err = cmd.run!('bundle exec rspec spec/fixtures/bad_test.rb', env:)
+            out, _err = cmd.run!('bundle exec rspec spec/fixtures/bad_test.rb', env: env)
             expect(out).to include('2nd try')
             expect(out).not_to include('10th try')
           end
 
           it 'runs good test examples once' do
-            out, _err = cmd.run!('bundle exec rspec spec/fixtures/good_test.rb', env:)
+            out, _err = cmd.run!('bundle exec rspec spec/fixtures/good_test.rb', env: env)
             expect(out).to include('1st try')
             expect(out).not_to include('2nd try')
           end
 
           it 'runs flaky test examples once' do
-            out, _err = cmd.run!('bundle exec rspec spec/fixtures/flaky_test.rb', env:)
+            out, _err = cmd.run!('bundle exec rspec spec/fixtures/flaky_test.rb', env: env)
             expect(out).to include('1st try')
             expect(out).not_to include('2nd try')
           end
@@ -104,18 +106,18 @@
           end
 
           it 'retries bad test examples the configured failed retry amount' do
-            out, _err = cmd.run!('bundle exec rspec spec/fixtures/bad_test.rb', env:)
+            out, _err = cmd.run!('bundle exec rspec spec/fixtures/bad_test.rb', env: env)
             expect(out).to include('1st try')
             expect(out).not_to include('2nd try')
           end
 
           it 'retries good test examples the configured success retry amount' do
-            out, _err = cmd.run!('bundle exec rspec spec/fixtures/good_test.rb', env:)
+            out, _err = cmd.run!('bundle exec rspec spec/fixtures/good_test.rb', env: env)
             expect(out).to include('10th try')
           end
 
           it 'retries flaky test examples until they flake' do
-            out, _err = cmd.run!('bundle exec rspec spec/fixtures/flaky_test.rb', env:)
+            out, _err = cmd.run!('bundle exec rspec spec/fixtures/flaky_test.rb', env: env)
             expect(out).to include('2nd try')
           end
         end
@@ -131,19 +133,19 @@
         end
 
         it 'retries bad test examples the configured failed retry amount' do
-          out, _err = cmd.run!('bundle exec rspec spec/fixtures/bad_test.rb', env:)
+          out, _err = cmd.run!('bundle exec rspec spec/fixtures/bad_test.rb', env: env)
           expect(out).to include('2nd try')
           expect(out).not_to include('10th try')
         end
 
         it 'runs good test examples once' do
-          out, _err = cmd.run!('bundle exec rspec spec/fixtures/good_test.rb', env:)
+          out, _err = cmd.run!('bundle exec rspec spec/fixtures/good_test.rb', env: env)
           expect(out).to include('1st try')
           expect(out).not_to include('2nd try')
         end
 
         it 'runs flaky test examples once' do
-          out, _err = cmd.run!('bundle exec rspec spec/fixtures/flaky_test.rb', env:)
+          out, _err = cmd.run!('bundle exec rspec spec/fixtures/flaky_test.rb', env: env)
           expect(out).to include('1st try')
           expect(out).not_to include('2nd try')
         end
@@ -161,19 +163,19 @@
         end
 
         it 'runs bad test examples once' do
-          out, _err = cmd.run!('bundle exec rspec spec/fixtures/bad_test.rb', env:)
+          out, _err = cmd.run!('bundle exec rspec spec/fixtures/bad_test.rb', env: env)
           expect(out).to include('1st try')
           expect(out).not_to include('2nd try')
         end
 
         it 'runs good test examples once' do
-          out, _err = cmd.run!('bundle exec rspec spec/fixtures/good_test.rb', env:)
+          out, _err = cmd.run!('bundle exec rspec spec/fixtures/good_test.rb', env: env)
           expect(out).to include('1st try')
           expect(out).not_to include('2nd try')
         end
 
         it 'runs flaky test examples once' do
-          out, _err = cmd.run!('bundle exec rspec spec/fixtures/flaky_test.rb', env:)
+          out, _err = cmd.run!('bundle exec rspec spec/fixtures/flaky_test.rb', env: env)
           expect(out).to include('1st try')
           expect(out).not_to include('2nd try')
         end
@@ -188,19 +190,19 @@
         end
 
         it 'runs bad test examples once' do
-          out, _err = cmd.run!('bundle exec rspec spec/fixtures/bad_test.rb', env:)
+          out, _err = cmd.run!('bundle exec rspec spec/fixtures/bad_test.rb', env: env)
           expect(out).to include('1st try')
           expect(out).not_to include('2nd try')
         end
 
         it 'runs good test examples once' do
-          out, _err = cmd.run!('bundle exec rspec spec/fixtures/good_test.rb', env:)
+          out, _err = cmd.run!('bundle exec rspec spec/fixtures/good_test.rb', env: env)
           expect(out).to include('1st try')
           expect(out).not_to include('2nd try')
         end
 
         it 'runs flaky test examples once' do
-          out, _err = cmd.run!('bundle exec rspec spec/fixtures/flaky_test.rb', env:)
+          out, _err = cmd.run!('bundle exec rspec spec/fixtures/flaky_test.rb', env: env)
           expect(out).to include('1st try')
           expect(out).not_to include('2nd try')
         end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index c5ab267..f9db90a 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require 'rspec/fortify'