diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index f8fab3c..ea10b9c 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -1,6 +1,8 @@
 ---
-name: coverage
+name: Coverage
+
 on: [push]
+
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -10,12 +12,8 @@ jobs:
       uses: ruby/setup-ruby@v1
       with:
         ruby-version: 3.2
-    - uses: amancevice/setup-code-climate@v0
-      with:
-        cc_test_reporter_id: ${{ secrets.CC_TEST_REPORTER_ID }}
-    - run: cc-test-reporter before-build
+        bundler-cache: true
     - name: Build and test with RSpec
-      run: |
-        bundle install --jobs 4 --retry 3
-        bundle exec rspec
-    - run: cc-test-reporter after-build
+      run: bundle exec rspec
+      env:
+        COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
diff --git a/.github/workflows/danger-comment.yml b/.github/workflows/danger-comment.yml
new file mode 100644
index 0000000..e6aa88c
--- /dev/null
+++ b/.github/workflows/danger-comment.yml
@@ -0,0 +1,11 @@
+name: Danger Comment
+
+on:
+  workflow_run:
+    workflows: [Danger]
+    types: [completed]
+
+jobs:
+  comment:
+    uses: numbata/danger-pr-comment/.github/workflows/danger-comment.yml@main
+    secrets: inherit
diff --git a/.github/workflows/danger.yml b/.github/workflows/danger.yml
index c643c4b..76c745c 100644
--- a/.github/workflows/danger.yml
+++ b/.github/workflows/danger.yml
@@ -1,22 +1,13 @@
----
-name: danger
+name: Danger
+
 on:
   pull_request:
     types: [opened, reopened, edited, synchronize]
+
 jobs:
   danger:
-    runs-on: ubuntu-20.04
-    steps:
-    - uses: actions/checkout@v3
-      with:
-        fetch-depth: 0
-    - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
-      with:
-        ruby-version: 2.7
-        bundler-cache: true
-    - name: Run Danger
-      run: |
-        # the personal token is public, this is ok, base64 encode to avoid tripping Github
-        TOKEN=$(echo -n Z2hwX0xNQ3VmanBFeTBvYkZVTWh6NVNqVFFBOEUxU25abzBqRUVuaAo= | base64 --decode)
-        DANGER_GITHUB_API_TOKEN=$TOKEN bundle exec danger --verbose
+    uses: numbata/danger-pr-comment/.github/workflows/danger-run.yml@main
+    secrets: inherit
+    with:
+      ruby-version: '3.1'
+      bundler-cache: true
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 9ffe62f..bc70a44 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -1,5 +1,7 @@
 name: Lint
+
 on: [push, pull_request]
+
 jobs:
   rubocop:
     name: RuboCop
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index cdbde68..a9aa482 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,6 +1,8 @@
 ---
-name: test
+name: Test
+
 on: [push, pull_request]
+
 jobs:
   test:
     runs-on: ubuntu-latest
@@ -12,6 +14,7 @@ jobs:
           - { ruby: '3.0', allowed-failure: false }
           - { ruby: '3.1', allowed-failure: false }
           - { ruby: '3.2', allowed-failure: false }
+          - { ruby: '4.0', allowed-failure: false }
           - { ruby: 'ruby-head', allowed-failure: true }
           - { ruby: 'truffleruby-head', allowed-failure: true }
           - { ruby: 'jruby-head', allowed-failure: true }
@@ -21,7 +24,7 @@ jobs:
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.entry.ruby }}
-      - run: bundle install --jobs=3 --retry=3 --path=vendor/bundle
+      - run: bundle install --jobs=3 --retry=3
       - run: bundle exec rake spec
         continue-on-error: ${{ matrix.entry.allowed-failure }}
       - name: Specs for when the i18n gem is not available
diff --git a/.rubocop.yml b/.rubocop.yml
index 1f7eac4..a71c181 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,7 +1,3 @@
-require:
-  - rubocop-rake
-  - rubocop-rspec
-
 AllCops:
   TargetRubyVersion: 2.7
   NewCops: enable
@@ -15,7 +11,7 @@ Metrics/BlockLength:
 RSpec/SpecFilePathFormat:
   Enabled: false
 
-RSpec/FilePath:
+Style/LineLength:
   Enabled: false
 
 Style/HashEachMethods:
@@ -27,4 +23,32 @@ Style/HashTransformKeys:
 Style/HashTransformValues:
   Enabled: true
 
+Naming/FileName:
+  Enabled: false
+
+Style/Documentation:
+  Enabled: false
+
+Naming/MethodParameterName:
+  Enabled: false
+
+RSpec/NestedGroups:
+  Enabled: false
+
+RSpec/ExampleLength:
+  Enabled: false
+
+RSpec/MultipleExpectations:
+  Enabled: false
+
+Lint/ConstantDefinitionInBlock:
+  Enabled: false
+
+RSpec/LeakyConstantDeclaration:
+  Enabled: false
+
 inherit_from: .rubocop_todo.yml
+
+plugins:
+  - rubocop-rake
+  - rubocop-rspec
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 9039cdc..00ce58d 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,72 +1,7 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2023-02-14 01:34:25 UTC using RuboCop version 1.45.1.
+# on 2025-12-30 16:44:41 UTC using RuboCop version 1.82.1.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
-
-# Offense count: 4
-# Configuration parameters: AllowedMethods.
-# AllowedMethods: enums
-Lint/ConstantDefinitionInBlock:
-  Exclude:
-    - 'spec/ruby-enum/enum_spec.rb'
-
-# Offense count: 1
-# Configuration parameters: ExpectMatchingDefinition, CheckDefinitionPathHierarchy, CheckDefinitionPathHierarchyRoots, Regex, IgnoreExecutableScripts, AllowedAcronyms.
-# CheckDefinitionPathHierarchyRoots: lib, spec, test, src
-# AllowedAcronyms: CLI, DSL, ACL, API, ASCII, CPU, CSS, DNS, EOF, GUID, HTML, HTTP, HTTPS, ID, IP, JSON, LHS, QPS, RAM, RHS, RPC, SLA, SMTP, SQL, SSH, TCP, TLS, TTL, UDP, UI, UID, UUID, URI, URL, UTF8, VM, XML, XMPP, XSRF, XSS
-Naming/FileName:
-  Exclude:
-    - 'lib/ruby-enum.rb'
-
-# Offense count: 6
-# Configuration parameters: MinNameLength, AllowNamesEndingInNumbers, AllowedNames, ForbiddenNames.
-# AllowedNames: as, at, by, cc, db, id, if, in, io, ip, of, on, os, pp, to
-Naming/MethodParameterName:
-  Exclude:
-    - 'lib/ruby-enum/enum.rb'
-
-# Offense count: 3
-# Configuration parameters: CountAsOne.
-RSpec/ExampleLength:
-  Max: 11
-
-# Offense count: 4
-RSpec/LeakyConstantDeclaration:
-  Exclude:
-    - 'spec/ruby-enum/enum_spec.rb'
-
-# Offense count: 6
-RSpec/MultipleExpectations:
-  Max: 11
-
-# Offense count: 18
-# Configuration parameters: EnforcedStyle, IgnoreSharedExamples.
-# SupportedStyles: always, named_only
-RSpec/NamedSubject:
-  Exclude:
-    - 'spec/ruby-enum/enum_spec.rb'
-
-# Offense count: 1
-# Configuration parameters: AllowedGroups.
-RSpec/NestedGroups:
-  Max: 4
-
-# Offense count: 4
-# Configuration parameters: AllowedConstants.
-Style/Documentation:
-  Exclude:
-    - 'spec/**/*'
-    - 'test/**/*'
-    - 'lib/ruby-enum/enum.rb'
-    - 'lib/ruby-enum/errors/base.rb'
-    - 'lib/ruby-enum/errors/uninitialized_constant_error.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, AllowedPatterns.
-# URISchemes: http, https
-Layout/LineLength:
-  Max: 148
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f845b29..1a3190e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
-### 1.0.1 (Next)
+### 1.1.0 (Next)
 
+* [#54](https://github.com/dblock/ruby-enum/pull/54): Add support for Ruby 4.0 - [@dblock](https://github.com/dblock).
+* [#53](https://github.com/dblock/ruby-enum/pull/53): Replace code climate with coveralls - [@dblock](https://github.com/dblock).
 * Your contribution here.
 
 ### 1.0.0 (2023/01/10)
diff --git a/Dangerfile b/Dangerfile
index a0a4a57..b4bc366 100644
--- a/Dangerfile
+++ b/Dangerfile
@@ -1,4 +1,6 @@
 # frozen_string_literal: true
 
+danger.import_dangerfile(gem: 'danger-pr-comment')
+
 changelog.check!
 toc.check!
diff --git a/Gemfile b/Gemfile
index dc4319a..3ce44a3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,14 +8,15 @@ gem 'rake'
 
 group :development, :test do
   gem 'danger'
-  gem 'danger-changelog', '0.6.1'
-  gem 'danger-toc', '0.2.0'
-  gem 'rspec', '~> 3.0'
-  gem 'rubocop', '~> 1.0'
+  gem 'danger-changelog'
+  gem 'danger-pr-comment'
+  gem 'danger-toc'
+  gem 'rspec'
+  gem 'rubocop', '1.82.1'
   gem 'rubocop-rake'
   gem 'rubocop-rspec'
 end
 
 group :test do
-  gem 'simplecov', require: false
+  gem 'coveralls_reborn', require: false
 end
diff --git a/README.md b/README.md
index 49ab445..38aed41 100644
--- a/README.md
+++ b/README.md
@@ -2,8 +2,8 @@ Ruby::Enum
 ==========
 
 [![Gem Version](http://img.shields.io/gem/v/ruby-enum.svg)](http://badge.fury.io/rb/ruby-enum)
-[![Build Status](https://github.com/dblock/ruby-enum/workflows/test/badge.svg?branch=master)](https://github.com/dblock/ruby-enum/actions)
-[![Code Climate](https://codeclimate.com/github/dblock/ruby-enum.svg)](https://codeclimate.com/github/dblock/ruby-enum)
+[![Test](https://github.com/dblock/ruby-enum/actions/workflows/test.yml/badge.svg)](https://github.com/dblock/ruby-enum/actions/workflows/test.yml)
+[![Coverage Status](https://coveralls.io/repos/github/dblock/ruby-enum/badge.svg?branch=master)](https://coveralls.io/github/dblock/ruby-enum?branch=master)
 
 Enum-like behavior for Ruby, heavily inspired by [this](http://www.rubyfleebie.com/enumerations-and-ruby), and improved upon [another blog post](http://code.dblock.org/how-to-define-enums-in-ruby).
 
diff --git a/lib/ruby-enum/errors/base.rb b/lib/ruby-enum/errors/base.rb
index 5ab2ee1..5e2dfdb 100644
--- a/lib/ruby-enum/errors/base.rb
+++ b/lib/ruby-enum/errors/base.rb
@@ -26,10 +26,10 @@ def compose_message(key, attributes = {})
           "\nSummary:\n  #{@summary}" + "\nResolution:\n  #{@resolution}"
         end
 
-        private
-
         BASE_KEY = 'ruby.enum.errors.messages' # :nodoc:
 
+        private
+
         # Given the key of the specific error and the options hash, translate the
         # message.
         #
diff --git a/lib/ruby-enum/version.rb b/lib/ruby-enum/version.rb
index fc7588c..ce01fd3 100644
--- a/lib/ruby-enum/version.rb
+++ b/lib/ruby-enum/version.rb
@@ -2,6 +2,6 @@
 
 module Ruby
   module Enum
-    VERSION = '1.0.1'
+    VERSION = '1.1.0'
   end
 end
diff --git a/spec/ruby-enum/enum/case_spec.rb b/spec/ruby-enum/enum/case_spec.rb
index 8e7c588..f3b6395 100644
--- a/spec/ruby-enum/enum/case_spec.rb
+++ b/spec/ruby-enum/enum/case_spec.rb
@@ -2,55 +2,56 @@
 
 require 'spec_helper'
 
-RSpec.describe Ruby::Enum::Case do
-  test_enum =
-    Class.new do
-      include Ruby::Enum
-      include Ruby::Enum::Case
-
-      define :RED, :red
-      define :GREEN, :green
-      define :BLUE, :blue
-    end
+module Case
+  class Colors
+    include Ruby::Enum
+    include Ruby::Enum::Case
+
+    define :RED, :red
+    define :GREEN, :green
+    define :BLUE, :blue
+  end
+end
 
+RSpec.describe Ruby::Enum::Case do
   describe '.case' do
     context 'when all cases are defined' do
-      subject { test_enum.case(test_enum::RED, cases) }
+      subject { Case::Colors.case(Case::Colors::RED, cases) }
 
       let(:cases) do
         {
-          [test_enum::RED, test_enum::GREEN] => -> { 'red or green' },
-          test_enum::BLUE => -> { 'blue' }
+          [Case::Colors::RED, Case::Colors::GREEN] => -> { 'red or green' },
+          Case::Colors::BLUE => -> { 'blue' }
         }
       end
 
       it { is_expected.to eq('red or green') }
 
       context 'when the value is nil' do
-        subject { test_enum.case(nil, cases) }
+        subject { Case::Colors.case(nil, cases) }
 
         it { is_expected.to be_nil }
       end
 
       context 'when the value is empty' do
-        subject { test_enum.case('', cases) }
+        subject { Case::Colors.case('', cases) }
 
         it { is_expected.to be_nil }
       end
 
       context 'when the value is the value of the enum' do
-        subject { test_enum.case(:red, cases) }
+        subject { Case::Colors.case(:red, cases) }
 
         it { is_expected.to eq('red or green') }
       end
 
       context 'when the value is used inside the lambda' do
-        subject { test_enum.case(test_enum::RED, cases) }
+        subject { Case::Colors.case(Case::Colors::RED, cases) }
 
         let(:cases) do
           {
-            [test_enum::RED, test_enum::GREEN] => ->(color) { "is #{color}" },
-            test_enum::BLUE => -> { 'blue' }
+            [Case::Colors::RED, Case::Colors::GREEN] => ->(color) { "is #{color}" },
+            Case::Colors::BLUE => -> { 'blue' }
           }
         end
 
@@ -60,12 +61,12 @@
 
     context 'when there are mutliple matches' do
       subject do
-        test_enum.case(
-          test_enum::RED,
+        Case::Colors.case(
+          Case::Colors::RED,
           {
-            [test_enum::RED, test_enum::GREEN] => -> { 'red or green' },
-            test_enum::RED => -> { 'red' },
-            test_enum::BLUE => -> { 'blue' }
+            [Case::Colors::RED, Case::Colors::GREEN] => -> { 'red or green' },
+            Case::Colors::RED => -> { 'red' },
+            Case::Colors::BLUE => -> { 'blue' }
           }
         )
       end
@@ -76,9 +77,9 @@
     context 'when not all cases are defined' do
       it 'raises an error' do
         expect do
-          test_enum.case(
-            test_enum::RED,
-            { [test_enum::RED, test_enum::GREEN] => -> { 'red or green' } }
+          Case::Colors.case(
+            Case::Colors::RED,
+            { [Case::Colors::RED, Case::Colors::GREEN] => -> { 'red or green' } }
           )
         end.to raise_error(Ruby::Enum::Case::ClassMethods::NotAllCasesHandledError)
       end
@@ -87,10 +88,10 @@
     context 'when not all cases are defined but :else is specified (default case)' do
       it 'does not raise an error' do
         expect do
-          result = test_enum.case(
-            test_enum::BLUE,
+          result = Case::Colors.case(
+            Case::Colors::BLUE,
             {
-              [test_enum::RED, test_enum::GREEN] => -> { 'red or green' },
+              [Case::Colors::RED, Case::Colors::GREEN] => -> { 'red or green' },
               else: -> { 'blue' }
             }
           )
@@ -103,11 +104,11 @@
     context 'when a superfluous case is defined' do
       it 'raises an error' do
         expect do
-          test_enum.case(
-            test_enum::RED,
+          Case::Colors.case(
+            Case::Colors::RED,
             {
-              [test_enum::RED, test_enum::GREEN] => -> { 'red or green' },
-              test_enum::BLUE => -> { 'blue' },
+              [Case::Colors::RED, Case::Colors::GREEN] => -> { 'red or green' },
+              Case::Colors::BLUE => -> { 'blue' },
               :something => -> { 'green' }
             }
           )
diff --git a/spec/ruby-enum/enum_spec.rb b/spec/ruby-enum/enum_spec.rb
index bd0f1c9..a3d811e 100644
--- a/spec/ruby-enum/enum_spec.rb
+++ b/spec/ruby-enum/enum_spec.rb
@@ -2,22 +2,21 @@
 
 require 'spec_helper'
 
-class Colors
-  include Ruby::Enum
-
-  define :RED, 'red'
-  define :GREEN, 'green'
-end
+describe Ruby::Enum do
+  class Colors
+    include Ruby::Enum
 
-class FirstSubclass < Colors
-  define :ORANGE, 'orange'
-end
+    define :RED, 'red'
+    define :GREEN, 'green'
+  end
 
-class SecondSubclass < FirstSubclass
-  define :PINK, 'pink'
-end
+  class FirstSubclass < Colors
+    define :ORANGE, 'orange'
+  end
 
-describe Ruby::Enum do
+  class SecondSubclass < FirstSubclass
+    define :PINK, 'pink'
+  end
   it 'returns an enum value' do
     expect(Colors::RED).to eq 'red'
     expect(Colors::GREEN).to eq 'green'
@@ -158,6 +157,18 @@ class SecondSubclass < FirstSubclass
     it 'returns values' do
       expect(Colors.values).to eq(%w[red green])
     end
+
+    context 'when a subclass is defined' do
+      it 'returns all values' do
+        expect(FirstSubclass.values).to eq(%w[red green orange])
+      end
+    end
+
+    context 'when a subclass of a subclass is defined' do
+      it 'returns all values' do
+        expect(SecondSubclass.values).to eq(%w[red green orange pink])
+      end
+    end
   end
 
   describe '#to_h' do
@@ -250,29 +261,23 @@ class EmptyEnums
     end
 
     context 'when defining a 2 level depth subclass' do
-      subject { SecondSubclass }
-
       it 'contains its own enums and all the enums defined in the parent classes' do
-        expect(subject::RED).to eq 'red'
-        expect(subject::GREEN).to eq 'green'
-        expect(subject::ORANGE).to eq 'orange'
-        expect(subject::PINK).to eq 'pink'
+        expect(SecondSubclass::RED).to eq 'red'
+        expect(SecondSubclass::GREEN).to eq 'green'
+        expect(SecondSubclass::ORANGE).to eq 'orange'
+        expect(SecondSubclass::PINK).to eq 'pink'
       end
 
       describe '#values' do
-        subject { SecondSubclass.values }
-
         it 'contains the values from all of the parent classes' do
-          expect(subject).to eq(%w[red green orange pink])
+          expect(SecondSubclass.values).to eq(%w[red green orange pink])
         end
       end
     end
 
     describe '#values' do
-      subject { FirstSubclass.values }
-
       it 'contains the values from the parent class' do
-        expect(subject).to eq(%w[red green orange])
+        expect(FirstSubclass.values).to eq(%w[red green orange])
       end
     end
   end
@@ -280,41 +285,40 @@ class EmptyEnums
   describe 'default value' do
     class Default
       include Ruby::Enum
+
       define :KEY
     end
 
-    subject { Default::KEY }
-
     it 'equals the key' do
-      expect(subject).to eq(:KEY)
+      expect(Default::KEY).to eq(:KEY)
     end
   end
 
   describe 'non constant definitions' do
     class States
       include Ruby::Enum
+
       define :created, 'Created'
       define :published, 'Published'
       define :undefined
     end
-    subject { States }
 
     it 'behaves like an enum' do
-      expect(subject.created).to eq 'Created'
-      expect(subject.published).to eq 'Published'
-      expect(subject.undefined).to eq :undefined
+      expect(States.created).to eq 'Created'
+      expect(States.published).to eq 'Published'
+      expect(States.undefined).to eq :undefined
 
-      expect(subject.key?(:created)).to be true
-      expect(subject.key('Created')).to eq :created
+      expect(States.key?(:created)).to be true
+      expect(States.key('Created')).to eq :created
 
-      expect(subject.value?('Created')).to be true
-      expect(subject.value(:created)).to eq 'Created'
+      expect(States.value?('Created')).to be true
+      expect(States.value(:created)).to eq 'Created'
 
-      expect(subject.key?(:undefined)).to be true
-      expect(subject.key(:undefined)).to eq :undefined
+      expect(States.key?(:undefined)).to be true
+      expect(States.key(:undefined)).to eq :undefined
 
-      expect(subject.value?(:undefined)).to be true
-      expect(subject.value(:undefined)).to eq :undefined
+      expect(States.value?(:undefined)).to be true
+      expect(States.value(:undefined)).to eq :undefined
     end
   end
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 38a174f..bdc51a2 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -4,8 +4,8 @@
 
 require 'rubygems'
 
-require 'simplecov'
-SimpleCov.start
+require 'coveralls'
+Coveralls.wear!
 
 require 'rspec'
 require 'ruby-enum'
diff --git a/spec_i18n/spec/i18n_spec.rb b/spec_i18n/spec/i18n_spec.rb
index 653b9ed..4de14ec 100644
--- a/spec_i18n/spec/i18n_spec.rb
+++ b/spec_i18n/spec/i18n_spec.rb
@@ -2,18 +2,20 @@
 
 require 'spec_helper'
 
-test_class = Class.new do
-  include Ruby::Enum
+module I18n
+  class Colors
+    include Ruby::Enum
 
-  define :RED, 'red'
-  define :GREEN, 'green'
+    define :RED, 'red'
+    define :GREEN, 'green'
+  end
 end
 
 describe Ruby::Enum do
   context 'when the i18n gem is not loaded' do
     it 'raises UninitializedConstantError on an invalid constant' do
       expect do
-        test_class::ANYTHING
+        I18n::Colors::ANYTHING
       end.to raise_error Ruby::Enum::Errors::UninitializedConstantError, /ruby.enum.errors.messages.uninitialized_constant.summary/
     end
 
@@ -24,7 +26,7 @@
 
       it 'raises DuplicateKeyError' do
         expect do
-          test_class.class_eval do
+          I18n::Colors.class_eval do
             define :RED, 'some'
           end
         end.to raise_error Ruby::Enum::Errors::DuplicateKeyError, /ruby.enum.errors.messages.duplicate_key.message/
@@ -38,7 +40,7 @@
 
       it 'raises a DuplicateValueError' do
         expect do
-          test_class.class_eval do
+          I18n::Colors.class_eval do
             define :Other, 'red'
           end
         end.to raise_error Ruby::Enum::Errors::DuplicateValueError, /ruby.enum.errors.messages.duplicate_value.summary/