diff --git a/src/Twig/AppExtension.php b/src/Twig/AppExtension.php
index fecbfb71d..5b54e6c38 100644
--- a/src/Twig/AppExtension.php
+++ b/src/Twig/AppExtension.php
@@ -12,8 +12,7 @@
 namespace App\Twig;
 
 use Symfony\Component\Intl\Locales;
-use Twig\Extension\AbstractExtension;
-use Twig\TwigFunction;
+use Twig\Attribute\AsTwigFunction;
 
 /**
  * See https://symfony.com/doc/current/templating/twig_extension.html.
@@ -22,7 +21,7 @@
  * @author Javier Eguiluz <javier.eguiluz@gmail.com>
  * @author Julien ITARD <julienitard@gmail.com>
  */
-final class AppExtension extends AbstractExtension
+final class AppExtension
 {
     /**
      * @var list<array{code: string, name: string}>|null
@@ -38,14 +37,6 @@ public function __construct(
     ) {
     }
 
-    public function getFunctions(): array
-    {
-        return [
-            new TwigFunction('locales', [$this, 'getLocales']),
-            new TwigFunction('is_rtl', [$this, 'isRtl']),
-        ];
-    }
-
     /**
      * Takes the list of codes of the locales (languages) enabled in the
      * application and returns an array with the name of each locale written
@@ -53,6 +44,7 @@ public function getFunctions(): array
      *
      * @return array<int, array<string, string>>
      */
+    #[AsTwigFunction('locales')]
     public function getLocales(): array
     {
         if (null !== $this->locales) {
@@ -71,6 +63,7 @@ public function getLocales(): array
     /**
      * Check if the given locale is RTL.
      */
+    #[AsTwigFunction('is_rtl')]
     public function isRtl(?string $locale = null): bool
     {
         $locale = $locale ?? $this->defaultLocale;
diff --git a/src/Twig/SourceCodeExtension.php b/src/Twig/SourceCodeExtension.php
index 2f9e013b5..6cc400b72 100644
--- a/src/Twig/SourceCodeExtension.php
+++ b/src/Twig/SourceCodeExtension.php
@@ -13,10 +13,9 @@
 
 use Symfony\Component\DependencyInjection\Attribute\Autowire;
 use Symfony\Component\ErrorHandler\ErrorRenderer\FileLinkFormatter;
+use Twig\Attribute\AsTwigFunction;
 use Twig\Environment;
-use Twig\Extension\AbstractExtension;
 use Twig\TemplateWrapper;
-use Twig\TwigFunction;
 
 use function Symfony\Component\String\u;
 
@@ -29,7 +28,7 @@
  * @author Ryan Weaver <weaverryan@gmail.com>
  * @author Javier Eguiluz <javier.eguiluz@gmail.com>
  */
-final class SourceCodeExtension extends AbstractExtension
+final class SourceCodeExtension
 {
     /**
      * @var callable|null
@@ -49,17 +48,10 @@ public function setController(?callable $controller): void
         $this->controller = $controller;
     }
 
-    public function getFunctions(): array
-    {
-        return [
-            new TwigFunction('link_source_file', $this->linkSourceFile(...), ['is_safe' => ['html'], 'needs_environment' => true]),
-            new TwigFunction('show_source_code', $this->showSourceCode(...), ['is_safe' => ['html'], 'needs_environment' => true]),
-        ];
-    }
-
     /**
      * Render a link to a source file.
      */
+    #[AsTwigFunction('link_source_file', isSafe: ['html'])]
     public function linkSourceFile(Environment $twig, string $file, int $line): string
     {
         $text = str_replace('\\', '/', $file);
@@ -79,6 +71,7 @@ public function linkSourceFile(Environment $twig, string $file, int $line): stri
         );
     }
 
+    #[AsTwigFunction('show_source_code', isSafe: ['html'])]
     public function showSourceCode(Environment $twig, string|TemplateWrapper $template): string
     {
         return $twig->render('debug/source_code.html.twig', [
diff --git a/tests/Twig/AppExtensionTest.php b/tests/Twig/AppExtensionTest.php
new file mode 100644
index 000000000..e38997270
--- /dev/null
+++ b/tests/Twig/AppExtensionTest.php
@@ -0,0 +1,39 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig;
+
+use App\Twig\AppExtension;
+use PHPUnit\Framework\TestCase;
+
+class AppExtensionTest extends TestCase
+{
+    public function testGetLocales(): void
+    {
+        $extension = new AppExtension(['ar', 'es', 'fr'], 'ar');
+
+        $this->assertSame([
+            ['code' => 'ar', 'name' => 'العربية'],
+            ['code' => 'es', 'name' => 'español'],
+            ['code' => 'fr', 'name' => 'français'],
+        ], $extension->getLocales());
+    }
+
+    public function testIsRtl(): void
+    {
+        $extension = new AppExtension(['ar', 'es', 'fr'], 'ar');
+
+        $this->assertFalse($extension->isRtl('fr'));
+        $this->assertFalse($extension->isRtl('es'));
+        $this->assertTrue($extension->isRtl('ar'));
+        $this->assertTrue($extension->isRtl());
+    }
+}