diff --git a/.coveralls.yml b/.coveralls.yml
new file mode 100644
index 00000000..3501cd0a
--- /dev/null
+++ b/.coveralls.yml
@@ -0,0 +1,2 @@
+service_name: github
+
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 26c27ed3..3d37be2f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -35,3 +35,9 @@ jobs:
         run: |
           bundle install
           bundle exec rake
+      - name: Coveralls
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+      - name: Coveralls Finished
+        uses: coverallsapp/github-action@master
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 1f4d35ad..48c3e669 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@
 .rspec_status
 Gemfile.lock
 pkg
+coverage
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 79c8093a..d4af22f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@
 * [#481](https://github.com/slack-ruby-client/pulls/481): Update API from [slack-api-ref@7c22d0b](https://github.com/slack-ruby/slack-api-ref/commit/7c22d0b) - [@slack-ruby-ci-bot](https://github.com/apps/slack-ruby-ci-bot).
 * [#488](https://github.com/slack-ruby-client/pulls/488): Update API from [slack-api-ref@a45def2](https://github.com/slack-ruby/slack-api-ref/commit/a45def2) - [@slack-ruby-ci-bot](https://github.com/apps/slack-ruby-ci-bot).
 * [#490](https://github.com/slack-ruby/slack-ruby-client/pull/490): Add changelog uri to gemspec - [@MatheusRich](https://github.com/MatheusRich).
+* [#491](https://github.com/slack-ruby/slack-ruby-client/pull/491): Added code coverage - [@dblock](https://github.com/dblock).
 * Your contribution here.
 
 ### 2.1.0 (2023/03/17)
diff --git a/Gemfile b/Gemfile
index bfd457f1..52d9fd2d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -23,6 +23,8 @@ group :test do
   gem 'rubocop-performance'
   gem 'rubocop-rake'
   gem 'rubocop-rspec'
+  gem 'simplecov'
+  gem 'simplecov-lcov'
   gem 'timecop'
   gem 'vcr'
   gem 'webmock'
diff --git a/README.md b/README.md
index 5729a19f..27c79d74 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@ Slack Ruby Client
 [![Integration Tests](https://github.com/slack-ruby/slack-ruby-client/actions/workflows/integration_test.yml/badge.svg?branch=master)](https://github.com/slack-ruby/slack-ruby-client/actions/workflows/integration_test.yml)
 [![Tests](https://github.com/slack-ruby/slack-ruby-client/actions/workflows/test.yml/badge.svg?branch=master)](https://github.com/slack-ruby/slack-ruby-client/actions/workflows/test.yml)
 [![Code Climate](https://codeclimate.com/github/slack-ruby/slack-ruby-client/badges/gpa.svg)](https://codeclimate.com/github/slack-ruby/slack-ruby-client)
+[![Coverage Status](https://coveralls.io/repos/github/slack-ruby/slack-ruby-client/badge.svg?branch=master)](https://coveralls.io/github/slack-ruby/slack-ruby-client?branch=master)
 
 A Ruby client for the Slack [Web](https://api.slack.com/web), [RealTime Messaging](https://api.slack.com/rtm) and [Events](https://api.slack.com/events-api) APIs. Comes with a handy command-line client, too. If you are not familiar with these concepts, you might want to watch [this video](http://code.dblock.org/2016/03/11/your-first-slack-bot-service-video.html).
 
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index f57133b5..119ef7d4 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -5,6 +5,15 @@
 require 'rspec'
 require 'timecop'
 
+require 'simplecov'
+require 'simplecov-lcov'
+SimpleCov::Formatter::LcovFormatter.config do |c|
+  c.report_with_single_file = true
+  c.single_report_path = 'coverage/lcov.info'
+end
+SimpleCov.formatter = SimpleCov::Formatter::LcovFormatter
+SimpleCov.start
+
 require 'slack_ruby_client'
 
 Dir[File.join(File.dirname(__FILE__), 'support', '**/*.rb')].each do |file|