diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..25aae2f
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,88 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+    name: PHP ${{ matrix.php-version }} Test
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    
+    strategy:
+      fail-fast: false
+      matrix:
+        php-version: ['7.3', '7.4', '8.0', '8.1', '8.2', '8.3']
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+    
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php-version }}
+        extensions: dom, mbstring
+        coverage: xdebug
+    
+    - name: Validate composer.json and composer.lock
+      run: composer validate --strict
+    
+    - name: Cache Composer packages
+      id: composer-cache
+      uses: actions/cache@v4
+      with:
+        path: vendor
+        key: ${{ runner.os }}-php-${{ matrix.php-version }}-${{ hashFiles('**/composer.json') }}
+        restore-keys: |
+          ${{ runner.os }}-php-${{ matrix.php-version }}-
+    
+    - name: Install dependencies
+      run: composer install --prefer-dist --no-progress --no-interaction
+    
+    - name: Run test suite
+      run: vendor/bin/phpunit --coverage-clover=coverage.xml
+    
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v5
+      if: matrix.php-version == '8.3'
+      with:
+        files: ./coverage.xml
+        fail_ci_if_error: false
+        token: ${{ secrets.CODECOV_TOKEN }}
+  
+  code-quality:
+    name: Code Quality
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+    
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: '8.3'
+        extensions: dom, mbstring
+        tools: cs2pr
+    
+    - name: Cache Composer packages
+      id: composer-cache
+      uses: actions/cache@v4
+      with:
+        path: vendor
+        key: ${{ runner.os }}-php-8.3-${{ hashFiles('**/composer.json') }}
+        restore-keys: |
+          ${{ runner.os }}-php-8.3-
+    
+    - name: Install dependencies
+      run: composer install --prefer-dist --no-progress --no-interaction
+    
+    - name: Run PHP_CodeSniffer
+      run: vendor/bin/phpcs --report=checkstyle | cs2pr
diff --git a/.gitignore b/.gitignore
index 183037e..2a681d8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,6 @@ vendor/
 /demo/bower_components
 /demo/node_modules
 .DS_Store
-.idea
\ No newline at end of file
+.idea
+.phpunit.result.cache
+coverage.xml
\ No newline at end of file
diff --git a/README.md b/README.md
index 357c573..132f0e7 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,8 @@
 php-htmldiff
 ============
 
-[![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/caxy/php-htmldiff/badges/quality-score.png?b=master)][badge_score]
-[![Build Status](https://scrutinizer-ci.com/g/caxy/php-htmldiff/badges/build.png?b=master)][badge_status]
-[![Code Coverage](https://scrutinizer-ci.com/g/caxy/php-htmldiff/badges/coverage.png?b=master)][badge_coverage]
+[![CI](https://github.com/caxy/php-htmldiff/workflows/CI/badge.svg)][badge_ci]
+[![Code Coverage](https://codecov.io/gh/caxy/php-htmldiff/branch/master/graph/badge.svg)][badge_coverage]
 [![Packagist](https://img.shields.io/packagist/dt/caxy/php-htmldiff.svg)][badge_packagist]
 [![Average time to resolve an issue](http://isitmaintained.com/badge/resolution/caxy/php-htmldiff.svg)][badge_resolve]
 [![Percentage of issues still open](http://isitmaintained.com/badge/open/caxy/php-htmldiff.svg)][badge_issues]
@@ -213,9 +212,8 @@ php-htmldiff is available under [GNU General Public License, version 2][gnu]. Se
 * Add documentation on alternative htmldiff engines and perhaps some comparisons
 
 
-[badge_score]: https://scrutinizer-ci.com/g/caxy/php-htmldiff/?branch=master
-[badge_status]: https://scrutinizer-ci.com/g/caxy/php-htmldiff/build-status/master
-[badge_coverage]: https://scrutinizer-ci.com/g/caxy/php-htmldiff/?branch=master
+[badge_ci]: https://github.com/caxy/php-htmldiff/actions/workflows/ci.yml
+[badge_coverage]: https://codecov.io/gh/caxy/php-htmldiff
 [badge_packagist]: https://packagist.org/packages/caxy/php-htmldiff
 [badge_resolve]: http://isitmaintained.com/project/caxy/php-htmldiff "Average time to resolve an issue"
 [badge_issues]: http://isitmaintained.com/project/caxy/php-htmldiff "Percentage of issues still open"
diff --git a/composer.json b/composer.json
index 9e7c0fd..2891b43 100644
--- a/composer.json
+++ b/composer.json
@@ -26,7 +26,8 @@
     },
     "require-dev": {
         "phpunit/phpunit": "~9.0",
-        "doctrine/cache": "~1.0"
+        "doctrine/cache": "~1.0",
+        "squizlabs/php_codesniffer": "^3.7"
     },
     "suggest": {
         "doctrine/cache": "Used for caching the calculated diffs using a Doctrine Cache Provider"