diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c1b3578c..a22711b9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -86,9 +86,7 @@ jobs:
         if: ${{ matrix.php-version != env.COVERAGE_PHP_VERSION }}
 
       - name: Run PHPUnit with coverage
-        run: |
-          mkdir -p build/logs
-          vendor/bin/phpunit --coverage-clover build/logs/clover.xml
+        run: vendor/bin/phpunit --coverage-clover clover.xml
         env:
           CALCULATOR: ${{ matrix.calculator }}
         if: ${{ matrix.php-version == env.COVERAGE_PHP_VERSION }}
@@ -100,8 +98,8 @@ jobs:
           BCMATH_DEFAULT_SCALE: 8
         if: ${{ matrix.calculator == 'BCMath' }}
 
-      - name: Upload coverage report to Coveralls
-        run: vendor/bin/php-coveralls --coverage_clover=build/logs/clover.xml -v
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v5
         env:
-          COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
         if: ${{ matrix.php-version == env.COVERAGE_PHP_VERSION }}
diff --git a/README.md b/README.md
index e97ac5c8..bd013f83 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 A PHP library to work with arbitrary precision numbers.
 
 [![Build Status](https://github.com/brick/math/workflows/CI/badge.svg)](https://github.com/brick/math/actions)
-[![Coverage Status](https://coveralls.io/repos/github/brick/math/badge.svg?branch=master)](https://coveralls.io/github/brick/math?branch=master)
+[![Coverage Status](https://codecov.io/github/brick/math/graph/badge.svg)](https://codecov.io/github/brick/math)
 [![Latest Stable Version](https://poser.pugx.org/brick/math/v/stable)](https://packagist.org/packages/brick/math)
 [![Total Downloads](https://poser.pugx.org/brick/math/downloads)](https://packagist.org/packages/brick/math)
 [![License](https://img.shields.io/badge/license-MIT-blue.svg)](http://opensource.org/licenses/MIT)
diff --git a/composer.json b/composer.json
index ad1dfe07..bcacf9b5 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,6 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^11.5",
-        "php-coveralls/php-coveralls": "^2.2",
         "phpstan/phpstan": "2.1.22"
     },
     "autoload": {