diff --git a/.envrc b/.envrc
index 904f74d..c4ca671 100644
--- a/.envrc
+++ b/.envrc
@@ -1,2 +1,5 @@
 alias be='bundle exec'
 alias bep='bundle exec puma -C config/puma.rb --debug -v --redirect-stderr puma.stderr --redirect-stdout puma.stdout  spec/rackup/bind.ru'
+
+
+[[ -f .envrc.local ]] && source .envrc.local
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b6d3c88..ce7041f 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,13 +1,13 @@
 name: Ruby
 
-on: [push,pull_request]
+on: [pull_request, workflow_dispatch]
 
 jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: [3.2.0, 3.1.3, 3.0.5, 2.7.2, 2.6.6, 2.5.7]
+        ruby-version: [3.3.1, 3.2.4, 3.1.5, 3.0.7, 2.7.8, 2.6.10]
 
     env:
       RUBY_VERSION: ${{ matrix.ruby-version }}
@@ -20,21 +20,25 @@ jobs:
       uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby-version }}
+        bundler-cache: true # runs 'bun
 
     - name: Run Specs
       run: make test-all
 
     - name: Rubocop
-      run: bundle exec rubocop
-
-    - uses: codecov/codecov-action@v3
-      with:
-        token: ${{ secrets.CODECOV_TOKEN }} # not required for public repos
-        directory: coverage
-        env_vars: RUBY_VERSION
-        files: codecov-result.json
-        flags: unittests # optional
-        name: codecov-umbrella # optional
-        fail_ci_if_error: false # optional (default = false)
-        verbose: true # optional (default = false)
-
+      run: bundle exec rubocop --parallel
+
+    - name: Upload to Codecov
+      run: |
+        if [[ $(ruby -e 'puts RUBY_VERSION') == '3.3.1' ]]; then
+          curl -Os https://uploader.codecov.io/latest/linux/codecov
+          chmod +x codecov
+          ./codecov
+        fi
+
+#    - uses: codecov/codecov-action@v4
+#      with:
+#        fail_ci_if_error: false # optional (default = false)
+#        flags: rspecs # optional
+#        token: ${{ secrets.CODECOV_TOKEN }} # required
+#        verbose: true # optional (default = false)`
diff --git a/.gitignore b/.gitignore
index 0e40804..23547ae 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,3 +26,4 @@
 /tmp/pids/*
 /Gemfile
 **/.DS_Store
+.envrc.local
diff --git a/.rubocop.yml b/.rubocop.yml
index cba663c..47c339b 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,9 +1,15 @@
+require:
+  - rubocop-performance
+  - rubocop-rake
+  - rubocop-rspec
+
 inherit_gem:
   relaxed-rubocop: .rubocop.yml
 
 AllCops:
-  TargetRubyVersion: 2.4
   NewCops: enable
+  SuggestExtensions: true
+  TargetRubyVersion: 2.6
 
 Style/OptionalBooleanParameter:
   Exclude:
@@ -24,5 +30,12 @@ Naming/FileName:
   Exclude:
     - 'lib/puma-daemon.rb'
 
+Rake/Desc:
+  Enabled: false
+
+RSpec/MultipleMemoizedHelpers:
+  Max: 20
+
+
 # Gemspec/DevelopmentDependencies:
 #   Enabled: false
diff --git a/Gemfile.puma-v5 b/Gemfile.puma-v5
index adb6892..3f02647 100644
--- a/Gemfile.puma-v5
+++ b/Gemfile.puma-v5
@@ -9,8 +9,21 @@ gem 'puma', '~> 5.0'
 gem 'rack', '~> 2'
 gem 'rake', '~> 13.0'
 
+group :development, :test do
+  gem 'asciidoctor'
+  gem 'yard'
+end
+
 group :test do
   gem 'codecov', require: false
+  gem 'httparty'
+  gem 'relaxed-rubocop'
   gem 'rspec', '~> 3.0'
-  gem 'rubocop', '~> 0.80'
+  gem 'rspec-its'
+  gem 'rubocop'
+  gem 'rubocop-performance'
+  gem 'rubocop-rake'
+  gem 'rubocop-rspec'
+  gem 'simplecov'
+  gem 'simplecov-cobertura', require: false
 end
diff --git a/Gemfile.puma-v6 b/Gemfile.puma-v6
index 91af7d1..2365040 100644
--- a/Gemfile.puma-v6
+++ b/Gemfile.puma-v6
@@ -9,8 +9,21 @@ gem 'puma', '~> 6.0'
 gem 'rack', '~> 2'
 gem 'rake', '~> 13.0'
 
+group :development, :test do
+  gem 'asciidoctor'
+  gem 'yard'
+end
+
 group :test do
   gem 'codecov', require: false
+  gem 'httparty'
+  gem 'relaxed-rubocop'
   gem 'rspec', '~> 3.0'
-  gem 'rubocop', '~> 0.80'
+  gem 'rspec-its'
+  gem 'rubocop'
+  gem 'rubocop-performance'
+  gem 'rubocop-rake'
+  gem 'rubocop-rspec'
+  gem 'simplecov'
+  gem 'simplecov-cobertura', require: false
 end
diff --git a/Makefile b/Makefile
index 66b49c3..0b81165 100755
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,9 @@
-# vim: tabstop=8
-# vim: shiftwidth=8
+# vim: ts=8
+# vim: sw=8
 # vim: noexpandtab
 
 # grep '^[a-z\-]*:' Makefile | cut -d: -f 1 | tr '\n' ' '
-.PHONY:	 help docker-build docker-bash
+.PHONY:	 help docker-build docker-bash puma-v5 puma-v6 test test-all rubocop generate-pdf
 
 RUBY_VERSION    		:= $(cat .ruby-version)
 OS	 		 	:= $(shell uname -s | tr '[:upper:]' '[:lower:]')
@@ -14,7 +14,7 @@ CURRENT_DIR 			:= $(notdir $(patsubst %/,%,$(dir $(MAKEFILE_PATH))))
 PUMAD_HOME			:= $(shell dirname $(MAKEFILE_PATH))
 
 help:	   			## Prints help message auto-generated from the comments.
-				@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
+				@grep -E '^[a-zA-Z0-9_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
 
 puma-v5: 			## Installs puma 5.0.0
 				@ln -nfs Gemfile.puma-v5 Gemfile
@@ -37,7 +37,7 @@ rubocop:			## Run rubocop
 				@bundle check || bundle install
 				@bundle exec rubocop --format=progress
 
-				
+
 docker-build-ruby:		## Builds the Docker image by compiling ruby 3.0.0
 				@docker build -f Dockerfile.build    -t puma-daemon:latest .
 
@@ -55,5 +55,5 @@ generate-pdf:			## Regenerates README,pdf from README.adoc
 				@bash -c "source ~/.bashmatic/init.sh && ~/.bashmatic/bin/adoc2pdf README.adoc"
 
 clean:				## Clean-up
-				@rm -rf Gemfile Gemfile.lock coverage 
- 
+				@rm -rf Gemfile Gemfile.lock coverage
+
diff --git a/codecov.yml b/codecov.yml
index 5fea271..1916113 100644
--- a/codecov.yml
+++ b/codecov.yml
@@ -1,4 +1,34 @@
-comment: 
-  layout: "reach,diff,flags,tree,betaprofiling"
-  show_critical_paths: true
+codecov:
+  ci:
+    - "github.com"
+  max_report_age: 24
+  disable_default_path_fixes: no
+  require_ci_to_pass: yes
+  notify:
+    after_n_builds: 1
+    wait_for_ci: yes
+
+github_checks:
+  annotations: true
+
+coverage:
+  range: 50..75
+  round: down
+  precision: 2
+  status:
+    patch: false
+    project:
+      puma-daemon: # This can be anything, but it needs to exist as the name
+        # basic settings
+        target: 80%
+        threshold: 5%
+        base: auto 
+        if_ci_failed: ignore #success, failure, error, ignore
+        only_pulls: false
+        flags: 
+          - rspecs
+        paths: 
+          - lib
+        informational: true
+        removed_code_behavior: off 
 
diff --git a/lib/puma/daemon/runner_adapter.rb b/lib/puma/daemon/runner_adapter.rb
index 8efbd61..c81e61c 100644
--- a/lib/puma/daemon/runner_adapter.rb
+++ b/lib/puma/daemon/runner_adapter.rb
@@ -4,6 +4,7 @@
 
 module Puma
   module Daemon
+    # noinspection RubySuperCallWithoutSuperclassInspection
     module RunnerAdapter
       class << self
         def included(base)
@@ -14,7 +15,7 @@ def included(base)
 
           base.class_eval do
             def output_header(mode)
-              super(mode)
+              super
 
               daemonize! if daemon?
             end
@@ -35,10 +36,10 @@ def daemonize!
             end
 
             def log(str)
-              return if str =~ /Ctrl-C/
+              return if str.include?('Ctrl-C')
 
               begin
-                super(str)
+                super
               rescue StandardError
                 puts(str)
               end
diff --git a/lib/puma/daemon/version.rb b/lib/puma/daemon/version.rb
index a444938..ebc31bb 100644
--- a/lib/puma/daemon/version.rb
+++ b/lib/puma/daemon/version.rb
@@ -2,6 +2,6 @@
 
 module Puma
   module Daemon
-    VERSION = '0.3.2'
+    VERSION = '0.4.0'
   end
 end
diff --git a/puma-daemon.gemspec b/puma-daemon.gemspec
index d7ee286..3472a2b 100644
--- a/puma-daemon.gemspec
+++ b/puma-daemon.gemspec
@@ -11,10 +11,10 @@ Gem::Specification.new do |spec|
   spec.summary       = "Restore somewhat Puma's ability to self-daemonize, since Puma 5.0 dropped it"
   spec.description   = <<~DESCRIPTION
 
-    In version 5.0 the authors of the popular Ruby web server Puma chose to remove the 
+    In version 5.0 the authors of the popular Ruby web server Puma chose to remove the#{' '}
     daemonization support from Puma, because the code wasn't wall maintained,
     and because other and better options exist for production deployments. For example
-    systemd, Docker/Kubernetes, Heroku, etc. 
+    systemd, Docker/Kubernetes, Heroku, etc.#{' '}
 
     Having said that, it was neat and often useful to daemonize Puma in development.
     This gem adds this support to Puma 5 & 6 (hopefully) without breaking anything in Puma
@@ -27,7 +27,7 @@ Gem::Specification.new do |spec|
   spec.homepage      = 'https://github.com/kigster/puma-daemon'
   spec.license       = 'MIT'
 
-  spec.required_ruby_version = Gem::Requirement.new('>= 2.4.0')
+  spec.required_ruby_version = Gem::Requirement.new('>= 2.6')
 
   spec.metadata['homepage_uri'] = spec.homepage
   spec.metadata['source_code_uri'] = 'https://github.com/kigster/puma-daemon'
@@ -46,15 +46,6 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'puma', '>= 5.0'
   spec.add_dependency 'rack'
 
-  spec.add_development_dependency 'asciidoctor'
-  spec.add_development_dependency 'codecov'
-  spec.add_development_dependency 'httparty'
-  spec.add_development_dependency 'relaxed-rubocop'
-  spec.add_development_dependency 'rspec-its'
-  spec.add_development_dependency 'rubocop'
-  spec.add_development_dependency 'simplecov'
-  spec.add_development_dependency 'yard'
-
   # For more information and examples about making a new gem, checkout our
   # guide at: https://bundler.io/guides/creating_gem.html
   spec.metadata['rubygems_mfa_required'] = 'true'
diff --git a/spec/puma/configuration_spec.rb b/spec/puma/configuration_spec.rb
index e643dc3..2e1aff6 100644
--- a/spec/puma/configuration_spec.rb
+++ b/spec/puma/configuration_spec.rb
@@ -14,28 +14,34 @@ module Puma
         end
       end
 
-      it(:puma_default_options) { should_not be_nil }
+      it(:puma_default_options) { is_expected.not_to be_nil }
 
-      context 'default_dsl' do
+      describe '#default_dsl' do
         subject { config.default_dsl.options }
-        its([:daemon]) { should be true }
-      end
 
-      context 'user_dsl' do
-        subject { config.user_dsl.options }
-        its([:daemon]) { should be true }
-        its([:binds]) { should eq ['tcp://0.0.0.0:3001'] }
+        its([:daemon]) { is_expected.to be true }
       end
 
-      describe 'config: daemonize(false)' do
-        let(:daemonize) { false }
-        context 'user_dsl' do
+      describe '#user_dsl' do
+        describe 'when using default options' do
           subject { config.user_dsl.options }
-          its([:daemon]) { should be false }
+
+          its([:daemon]) { is_expected.to be true }
+          its([:binds]) { is_expected.to eq ['tcp://0.0.0.0:3001'] }
+        end
+
+        describe 'when daemonize is false)' do
+          subject { config.user_dsl.options }
+
+          let(:daemonize) { false }
+
+          its([:daemon]) { is_expected.to be false }
         end
       end
 
-      context 'file_dsl' do
+      describe 'file_dsl' do
+        subject { config.options }
+
         let(:config) do
           ::Puma::Configuration.new do |c|
             c.rackup 'spec/rackup/bind.ru'
@@ -43,10 +49,23 @@ module Puma
           end.tap(&:load)
         end
 
+        its([:binds]) { is_expected.to eq ['tcp://0.0.0.0:3000'] }
+        its([:daemon]) { is_expected.to be true }
+      end
+
+      describe 'pidfile' do
         subject { config.options }
 
-        its([:binds]) { should eq ['tcp://0.0.0.0:3000'] }
-        its([:daemon]) { should be true }
+        let(:pidfile) { Tempfile.new('pidfile') }
+        let(:config) do
+          ::Puma::Configuration.new do |c|
+            c.pidfile(pidfile)
+            c.port 3000
+          end.tap(&:load)
+        end
+
+        its([:binds]) { is_expected.to eq ['tcp://0.0.0.0:3000'] }
+        its([:daemon]) { is_expected.to be true }
       end
     end
   end
diff --git a/spec/puma/daemon/runner_adapter_spec.rb b/spec/puma/daemon/runner_adapter_spec.rb
index 936dbcd..534a05f 100644
--- a/spec/puma/daemon/runner_adapter_spec.rb
+++ b/spec/puma/daemon/runner_adapter_spec.rb
@@ -17,7 +17,7 @@ module Daemon
 
       before {
         adapter.has_demonized = false
-        expect(::Process).to receive(:daemon)
+        allow(::Process).to receive(:daemon)
       }
 
       its(:daemonize!) { is_expected.to be_truthy }
diff --git a/spec/puma/daemon_spec.rb b/spec/puma/daemon_spec.rb
index 81cabe1..a113028 100644
--- a/spec/puma/daemon_spec.rb
+++ b/spec/puma/daemon_spec.rb
@@ -5,15 +5,15 @@
 
 module Puma
   RSpec.describe Daemon do
-    it 'has a version number' do
-      expect(Daemon::VERSION).not_to be nil
-    end
-
-    let(:environment) { 'production' }
-    let(:wait_booted) { -> { wait.sysread 1 } }
+    let(:cli) { ::Puma::Daemon::CLI.new(argv).cli }
     let(:argv) { [] }
+    let(:wait_booted) { -> { wait.sysread 1 } }
+    let(:environment) { 'production' }
 
-    include TmpPath
+    after do
+      @wait&.close
+      @ready&.close
+    end
 
     before do
       @environment = 'production'
@@ -22,33 +22,32 @@ module Puma
       @tmp_path1 = tmp_path('puma-test-1')
       @tmp_path2 = tmp_path('puma-test-2')
 
-      File.unlink @tmp_path1 if File.exist? @tmp_path1
-      File.unlink @tmp_path2 if File.exist? @tmp_path2
+      FileUtils.rm_f @tmp_path1
+      FileUtils.rm_f @tmp_path2
 
       @wait, @ready = IO.pipe
     end
 
-    after do
-      @wait&.close
-      @ready&.close
+    it 'has a version number' do
+      expect(Daemon::VERSION).not_to be_nil
     end
 
-    let(:cli) { ::Puma::Daemon::CLI.new(argv).cli }
+    include TmpPath
 
-    context 'runners' do
+    describe 'when starting Runners' do
       describe 'single-process daemon' do
         let(:argv) { [] }
 
         describe Single do
-          subject(:single) { ::Puma::Const::VERSION =~ /^5/ ? described_class.new(cli.launcher, cli.instance_variable_get(:@events)) : described_class.new(cli.launcher) }
+          subject(:single) { ::Puma::Const::VERSION.match?(/^5/) ? described_class.new(cli.launcher, cli.instance_variable_get(:@events)) : described_class.new(cli.launcher) }
           # This is not a real test
           it { is_expected.to respond_to :daemonize! }
         end
       end
 
-      describe 'multi-process cluster daemon' do
+      describe 'when using multi-process cluster daemon' do
         describe Cluster do
-          subject(:single) { ::Puma::Const::VERSION =~ /^5/ ? described_class.new(cli.launcher, cli.instance_variable_get(:@events)) : described_class.new(cli.launcher) }
+          subject(:single) { ::Puma::Const::VERSION.match?(/^5/) ? described_class.new(cli.launcher, cli.instance_variable_get(:@events)) : described_class.new(cli.launcher) }
           let(:url) { "unix://#{@tmp_path1}" }
           let(:argv) do
             ['-b', "unix://#{@tmp_path2}",
@@ -58,6 +57,7 @@ module Puma
              '--control-token', '',
              'spec/rackup/lobster.ru']
           end
+
           # This is not a real test
           it { is_expected.to respond_to :daemonize! }
         end
diff --git a/spec/puma/launch_spec.rb b/spec/puma/launch_spec.rb
index 15eed02..17a0574 100644
--- a/spec/puma/launch_spec.rb
+++ b/spec/puma/launch_spec.rb
@@ -26,7 +26,7 @@ def start_server_and_verify!(port, cli)
 
         Thread.join
 
-        expect(response).to_not be_nil
+        expect(response).not_to be_nil
 
         expect(response.code).to eq(200)
         expect(response.body).to eq('Hello World')
@@ -51,8 +51,8 @@ def start_server_and_verify!(port, cli)
       @port1 = 61_234
       @port2 = 61_235
 
-      File.unlink @tmp_path1 if File.exist? @tmp_path1
-      File.unlink @tmp_path2 if File.exist? @tmp_path2
+      FileUtils.rm_f @tmp_path1
+      FileUtils.rm_f @tmp_path2
 
       @wait, @ready = IO.pipe
     end
@@ -62,9 +62,9 @@ def start_server_and_verify!(port, cli)
       @ready&.close
     end
 
-    context 'runners' do
+    describe 'runner' do
       describe 'single-process daemon' do
-        describe Single do
+        describe 'Puma::Single' do
           let(:argv) { %W[-b tcp://0.0.0.0:#{@port1} spec/rackup/bind.ru] }
           let(:cli) { ::Puma::Daemon::CLI.new(argv).cli }
           let(:runner) { runner_instance(cli) }
@@ -72,11 +72,8 @@ def start_server_and_verify!(port, cli)
 
           before { ::RSpec::PumaHelpers.puma_kill[] }
 
-          it 'should have puma running on the background' do
+          it 'has puma running on the background' do
             start_server_and_verify!(port, cli)
-          end
-
-          after do
             expect(::RSpec::PumaHelpers.puma_pids[]).to be_empty
           end
         end
@@ -89,11 +86,8 @@ def start_server_and_verify!(port, cli)
 
           before { ::RSpec::PumaHelpers.puma_kill[] }
 
-          it 'should have puma running on the background' do
+          it 'has puma running on the background' do
             start_server_and_verify!(port, cli)
-          end
-
-          after do
             expect(::RSpec::PumaHelpers.puma_pids[]).to be_empty
           end
         end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 7e82f27..f36dc43 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -2,16 +2,10 @@
 
 require 'rspec'
 require 'rspec/its'
-require 'simplecov'
-
-if ENV['CODECOV_TOKEN']
-  require 'codecov'
-  SimpleCov.formatter = SimpleCov::Formatter::Codecov
-end
+require 'tempfile'
 
-SimpleCov.enable_for_subprocesses true
-SimpleCov.use_merging true
-SimpleCov.merge_timeout(4000)
+require 'simplecov'
+require 'simplecov-cobertura'
 
 SimpleCov.at_fork do |pid|
   # This needs a unique name so it won't be overwritten
@@ -22,7 +16,8 @@
   # start
   SimpleCov.formatter SimpleCov::Formatter::MultiFormatter.new([
                                                                  SimpleCov::Formatter::SimpleFormatter,
-                                                                 SimpleCov::Formatter::HTMLFormatter
+                                                                 SimpleCov::Formatter::HTMLFormatter,
+                                                                 SimpleCov::Formatter::CoberturaFormatter
                                                                ])
   SimpleCov.start
   SimpleCov.track_files 'lib/**/*.rb'
diff --git a/spec/support/puma_helpers.rb b/spec/support/puma_helpers.rb
index 2c89839..522d55b 100644
--- a/spec/support/puma_helpers.rb
+++ b/spec/support/puma_helpers.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 require 'puma/daemon'
-
+require 'open3'
 module RSpec
   module PumaHelpers
     HAS_FORK = ::Process.respond_to? :fork
@@ -20,7 +20,7 @@ def skip_sockets
       end
 
       def runner_instance(cli)
-        ::Puma::Const::VERSION =~ /^5/ ? described_class.new(cli.launcher, cli.instance_variable_get(:@events)) : described_class.new(cli.launcher)
+        ::Puma::Const::VERSION.match?(/^5/) ? described_class.new(cli.launcher, cli.instance_variable_get(:@events)) : described_class.new(cli.launcher)
       end
 
       def fork!(input: '')
@@ -65,21 +65,51 @@ def fork!(input: '')
         [pipes[:stdout][0].read, pipes[:stderr][0].read]
       end
 
+      PROCESS_CMD = "bash -c \"ps -ef | grep [p]uma | grep -v -E 'rspec|rubocop|Makefile|Rakefile'\" 2>&1"
+
       def puma_pids
-        lambda { `ps -ef | grep [p]uma | grep -v rspec | awk '{print $2}'`.split(/\n/) }
+        lambda do
+          stdout, code = Open3.capture2("#{PROCESS_CMD} | awk '{print $2}'")
+          stdout&.split("\n") if code == 0
+        end
+      end
+
+      def puma_pid_processes
+        lambda do
+          stdout, code = Open3.capture2(PROCESS_CMD)
+          stdout&.split("\n") if code == 0
+        end
       end
 
       def puma_kill
         lambda do
+          process_descriptions = puma_pid_processes[]
+
+          if process_descriptions.nil? || process_descriptions.empty?
+            puts 'NOTE: no child processes found after fork()'
+            return
+          end
+
+          current_pid = Process.pid
+
+          warn "Detected the following forked processes (current pid is #{current_pid})"
+          warn '———————————————————————————————————————————————————'
+          warn process_descriptions.join("\n")
+          warn '———————————————————————————————————————————————————'
+
           puma_pids[].each do |pid|
+            next if pid == current_pid
+
             warn "killing puma pid #{pid}"
+
             begin
-              Process.kill('TERM', pid.to_i)
+              Process.kill('SIGTERM', pid.to_i)
             rescue StandardError
               nil
             end
+
             begin
-              Process.kill('KILL', pid.to_i)
+              Process.kill('SIGKILL', pid.to_i)
             rescue StandardError
               nil
             end