diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0061ef9..1d59d19 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,29 +1,27 @@
-name: ci
+name: CI
 
-on:
-  push:
-    branches:
-      - "*"
-  pull_request:
-    branches:
-      - "*"
+on: [push, pull_request]
 
 jobs:
-  testgi:
-    runs-on: ubuntu-latest
+  test:
     strategy:
+      fail-fast: false
       matrix:
-        ruby-version: ["2.6", "2.7", "3.0"]
+        os: [ubuntu-latest]
+        ruby: ["2.6", "2.7", "3.0"]
+    runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v1
-    - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
-      with:
-        ruby-version: ${{ matrix.ruby-version }}
-        bundler-cache: true
+      - uses: actions/checkout@v2
 
-    - name: Run tests
-      run: |
-          bundle install --jobs 4 --retry 3
-          bundle exec rspec
+      - name: Set up Ruby, bundler and dependencies
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+
+      - name: Run tests
+        run: bundle exec rspec
+
+      - name: Run linter
+        run: bundle exec rubocop
diff --git a/.gitignore b/.gitignore
index 8e048f4..07d25c8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+.gems/
 *.gem
 *.rbc
 .bundle
diff --git a/CHANGELOG b/CHANGELOG
index 77f2c15..778bc6d 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,8 +1,5 @@
 = Heart Check - Changelog
 
-== Version 2.4.0 :: 2021-10-01
- * Add docker to facilitate development
-
 == Version 2.3.1 :: 2021-06-14
  * Move and rename GitHub template files to correct folder
 
diff --git a/README.md b/README.md
index 52b2d6c..65441db 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ declare service checks and an URI that returns the status for each service.
 With this gem you can monitor if your app has access to the database, a cache
 service, an API, etc.
 
-[![Build Status](https://travis-ci.org/locaweb/heartcheck.svg)](https://travis-ci.org/locaweb/heartcheck)
+[![Build Status](https://github.com/locaweb/heartcheck/actions/workflows/ci.yml/badge.svg)](https://github.com/locaweb/heartcheck/actions/workflows/ci.yml)
 [![Code Climate](https://codeclimate.com/github/locaweb/heartcheck/badges/gpa.svg)](https://codeclimate.com/github/locaweb/heartcheck)
 [![Ebert](https://ebertapp.io/github/locaweb/heartcheck.svg)](https://ebertapp.io/github/locaweb/heartcheck)
 
diff --git a/lib/heartcheck/checks/firewall.rb b/lib/heartcheck/checks/firewall.rb
index 31f5613..1ecca70 100644
--- a/lib/heartcheck/checks/firewall.rb
+++ b/lib/heartcheck/checks/firewall.rb
@@ -1,4 +1,4 @@
-# frozen_string_literal: true
+# frozen_string_literal: false
 
 module Heartcheck
   module Checks