diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3425e9a..11c91a6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,10 +15,20 @@ jobs:
             - name: Checkout
               uses: actions/checkout@v3
 
-            - name: PHP-CS-Fixer
-              uses: docker://oskarstark/php-cs-fixer-ga
+            - name: Setup PHP
+              uses: shivammathur/setup-php@v2
               with:
-                  args: --config=.php-cs-fixer.php --diff --dry-run
+                  php-version: '8.3'
+                  extensions: mbstring, xml
+
+            - name: Setup Castor
+              uses: castor-php/setup-castor@v1.0.0
+
+            - name: Install Composer dependencies
+              run: composer install --prefer-dist --no-interaction
+
+            - name: Run PHP-CS-Fixer check
+              run: castor cs --dry-run
 
     phpstan:
         name: PHPStan
@@ -27,10 +37,20 @@ jobs:
             - name: Checkout
               uses: actions/checkout@v3
 
-            - name: PHPStan
-              uses: docker://oskarstark/phpstan-ga
-              env:
-                  REQUIRE_DEV: true
+            - name: Setup PHP
+              uses: shivammathur/setup-php@v2
+              with:
+                  php-version: '8.3'
+                  extensions: mbstring, xml
+
+            - name: Setup Castor
+              uses: castor-php/setup-castor@v0.1.0
+
+            - name: Install Composer dependencies
+              run: composer install --prefer-dist --no-interaction
+
+            - name: Run PHPStan
+              run: castor phpstan
 
     ci:
         name: "Tests (PHP ${{ matrix.php-version }}, Symfony ${{ matrix.symfony }})"
diff --git a/.gitignore b/.gitignore
index c366096..abcbcde 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,10 @@
 /composer.lock
 /vendor
 
+# Castor
+/castor
+/.castor.stub.php
+
 # Temporary
 /tests/app/var
 /tests/app/public/bundles
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c86bcc6..61e6ec6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changes between versions
 
+## Unreleased
+
+* Replaced internal Makefile by Castor
+
 ## 1.10.0 (2026-02-03)
 
 * Added support for PHP 8.5
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index f31da8c..f81ded0 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -48,7 +48,7 @@ changes, improvements or alternatives may be given).
 Run the tests using the following script:
 
 ```shell
-make test
+castor test
 ```
 
 ## Manual testing
@@ -70,7 +70,7 @@ Use [PHP CS fixer](https://cs.symfony.com/) to make your code compliant with
 GifExceptionBundle's coding standards:
 
 ```shell
-make cs
+castor cs
 ```
 
 ## Keeping your fork up-to-date
diff --git a/Makefile b/Makefile
deleted file mode 100644
index 85e0cbb..0000000
--- a/Makefile
+++ /dev/null
@@ -1,18 +0,0 @@
-.PHONY: cs cs_dry_run test
-
-.DEFAULT_GOAL := help
-
-help:
-	@grep -h -e ' ## ' $(MAKEFILE_LIST) | fgrep -v fgrep | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-12s\033[0m %s\n", $$1, $$2}'
-
-cs: ## Fix PHP CS
-	vendor/bin/php-cs-fixer fix --verbose
-
-cs_dry_run: ## Test if PHP CS is correct
-	vendor/bin/php-cs-fixer fix --verbose --dry-run
-
-test: ## Run the test suite
-	vendor/bin/simple-phpunit
-
-phpstan: ## Run static analysis
-	vendor/bin/phpstan analyse -c phpstan.neon
diff --git a/README.md b/README.md
index 018e7de..f74d49f 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,22 @@ Although it would probably make more sense to use the former and push up the opt
 
 It uses [gifsicle](https://www.lcdf.org/gifsicle/) to optimize gifs via the [image-optimizer](https://github.com/psliwa/image-optimizer) library.
 
+## Development
+
+This project uses [Castor](https://castor.jolicode.com/) as a task runner for common development tasks.
+
+To install Castor, see the [installation documentation](https://castor.jolicode.com/getting-started/installation).
+
+Available tasks:
+
+```shell
+castor list           # List all available tasks
+castor test           # Run the test suite
+castor cs             # Fix PHP coding standards
+castor cs --dry-run   # Check PHP coding standards
+castor phpstan        # Run static analysis
+```
+
 ## Further documentation
 
 You can see the current and past versions using one of the following:
diff --git a/castor.php b/castor.php
new file mode 100644
index 0000000..d283680
--- /dev/null
+++ b/castor.php
@@ -0,0 +1,38 @@
+<?php
+
+/*
+ * This file is part of the GifExceptionBundle project.
+ *
+ * (c) JoliCode <coucou@jolicode.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+use Castor\Attribute\AsTask;
+
+use function Castor\run;
+
+#[AsTask(description: 'Fix CS', aliases: ['cs'])]
+function cs(bool $dryRun = false): void
+{
+    $command = 'vendor/bin/php-cs-fixer fix --verbose';
+
+    if ($dryRun) {
+        $command .= ' --dry-run';
+    }
+
+    run($command);
+}
+
+#[AsTask(description: 'Run the test suite')]
+function test(): void
+{
+    run('vendor/bin/simple-phpunit');
+}
+
+#[AsTask(description: 'Run static analysis')]
+function phpstan(): void
+{
+    run('vendor/bin/phpstan analyse -c phpstan.neon');
+}
diff --git a/phpstan.neon b/phpstan.neon
index e38533b..cf9aab1 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -5,3 +5,4 @@ parameters:
 	excludePaths:
 	    - vendor
 	    - tests
+	    - castor.php