diff --git a/.github/workflows/quicktest.yml b/.github/workflows/quicktest.yml
index d00eec5d3c..417766cc02 100644
--- a/.github/workflows/quicktest.yml
+++ b/.github/workflows/quicktest.yml
@@ -54,7 +54,7 @@ jobs:
         run: php bin/phpcs --config-set php_path php
 
       - name: 'PHPUnit: run the tests'
-        run: vendor/bin/phpunit tests/AllTests.php
+        run: vendor/bin/phpunit tests/AllTests.php --no-coverage
 
       # Note: The code style check is run as an integration test.
       - name: 'PHPCS: check code style without cache, no parallel'
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7dcf4f41b4..ef2fd41465 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -69,16 +69,31 @@ jobs:
       # Keys:
       # - custom_ini: Whether to run with specific custom ini settings to hit very specific
       #   code conditions.
+      # - coverage: Whether to run the tests with code coverage.
       matrix:
-        php: ['5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
+        php: ['5.5', '5.6', '7.0', '7.1', '7.3', '7.4', '8.0', '8.1', '8.2', '8.4']
         custom_ini: [false]
+        coverage: [false]
 
         include:
           # Builds running the basic tests with different PHP ini settings.
           - php: '5.5'
             custom_ini: true
+            coverage: false
           - php: '7.0'
             custom_ini: true
+            coverage: false
+
+          # Builds running the tests with code coverage.
+          - php: '5.4'
+            custom_ini: false
+            coverage: true
+          - php: '7.2'
+            custom_ini: true
+            coverage: true
+          - php: '8.3'
+            custom_ini: false
+            coverage: true
 
     name: "PHP: ${{ matrix.php }} ${{ matrix.custom_ini && ' with custom ini settings' || '' }}"
 
@@ -93,9 +108,9 @@ jobs:
         run: |
           # Set the "short_open_tag" ini to make sure specific conditions are tested.
           # Also turn on error_reporting to ensure all notices are shown.
-          if [[ ${{ matrix.custom_ini }} == true && "${{ matrix.php }}" == '5.5' ]]; then
+          if [[ ${{ matrix.custom_ini }} == true && "${{ startsWith( matrix.php, '5.' ) }}" == true ]]; then
             echo 'PHP_INI=error_reporting=-1, display_errors=On, date.timezone=Australia/Sydney, short_open_tag=On, asp_tags=On' >> $GITHUB_OUTPUT
-          elif [[ ${{ matrix.custom_ini }} == true && "${{ matrix.php }}" == '7.0' ]]; then
+          elif [[ ${{ matrix.custom_ini }} == true && "${{ startsWith( matrix.php, '7.' ) }}" == true ]]; then
             echo 'PHP_INI=error_reporting=-1, display_errors=On, date.timezone=Australia/Sydney, short_open_tag=On' >> $GITHUB_OUTPUT
           else
             echo 'PHP_INI=error_reporting=-1, display_errors=On' >> $GITHUB_OUTPUT
@@ -106,7 +121,7 @@ jobs:
         with:
           php-version: ${{ matrix.php }}
           ini-values: ${{ steps.set_ini.outputs.PHP_INI }}
-          coverage: none
+          coverage: ${{ matrix.coverage == true && 'xdebug' || 'none' }}
           tools: cs2pr
 
       # This action also handles the caching of the dependencies.
@@ -144,7 +159,12 @@ jobs:
       - name: 'PHPCS: set the path to PHP'
         run: php bin/phpcs --config-set php_path php
 
-      - name: 'PHPUnit: run the tests'
+      - name: 'PHPUnit: run the tests without code coverage'
+        if: ${{ matrix.coverage == false }}
+        run: vendor/bin/phpunit tests/AllTests.php --no-coverage
+
+      - name: 'PHPUnit: run the tests with code coverage'
+        if: ${{ matrix.coverage == true }}
         run: vendor/bin/phpunit tests/AllTests.php
 
       - name: 'PHPCS: check code style without cache, no parallel'
@@ -169,3 +189,24 @@ jobs:
       - name: 'PHPCS: check code style using the Phar file'
         if: ${{ matrix.custom_ini == false }}
         run: php phpcs.phar
+
+      - name: Upload coverage results to Coveralls
+        if: ${{ success() && matrix.coverage == true }}
+        uses: coverallsapp/github-action@v2
+        with:
+          format: clover
+          file: build/logs/clover.xml
+          flag-name: php-${{ matrix.php }}-custom-ini-${{ matrix.custom_ini }}
+          parallel: true
+
+  coveralls-finish:
+    needs: test
+    if: always() && needs.test.result == 'success'
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Coveralls Finished
+        uses: coverallsapp/github-action@v2
+        with:
+          parallel-finished: true
diff --git a/README.md b/README.md
index e65acb61e0..7c9932e9a1 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,7 @@ PHP_CodeSniffer
 [![Latest Stable Version](http://poser.pugx.org/phpcsstandards/php_codesniffer/v)](https://github.com/PHPCSStandards/PHP_CodeSniffer/releases)
 [![Validate](https://github.com/PHPCSStandards/PHP_CodeSniffer/actions/workflows/validate.yml/badge.svg?branch=master)](https://github.com/PHPCSStandards/PHP_CodeSniffer/actions/workflows/validate.yml)
 [![Test](https://github.com/PHPCSStandards/PHP_CodeSniffer/actions/workflows/test.yml/badge.svg?branch=master)](https://github.com/PHPCSStandards/PHP_CodeSniffer/actions/workflows/test.yml)
+[![Coverage Status](https://coveralls.io/repos/github/PHPCSStandards/PHP_CodeSniffer/badge.svg?branch=master)](https://coveralls.io/github/PHPCSStandards/PHP_CodeSniffer?branch=master)
 [![License](http://poser.pugx.org/phpcsstandards/php_codesniffer/license)](https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/master/licence.txt)
 
 ![Minimum PHP Version](https://img.shields.io/packagist/php-v/squizlabs/php_codesniffer.svg?maxAge=3600)