diff --git a/Attribute/AsAlias.php b/Attribute/AsAlias.php
index 0839afa48..c74b0923d 100644
--- a/Attribute/AsAlias.php
+++ b/Attribute/AsAlias.php
@@ -17,7 +17,7 @@
  * @author Alan Poulain <contact@alanpoulain.eu>
  */
 #[\Attribute(\Attribute::TARGET_CLASS | \Attribute::IS_REPEATABLE)]
-final class AsAlias
+class AsAlias
 {
     /**
      * @var list<string>
diff --git a/CHANGELOG.md b/CHANGELOG.md
index df3486a9d..5c6c41cfd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+7.4
+---
+
+ * Allow `#[AsAlias]` to be extended
+
 7.3
 ---
 
diff --git a/Loader/FileLoader.php b/Loader/FileLoader.php
index bc38767bc..3cf23cf98 100644
--- a/Loader/FileLoader.php
+++ b/Loader/FileLoader.php
@@ -216,7 +216,7 @@ public function registerClasses(Definition $prototype, string $namespace, string
             }
             $r = $this->container->getReflectionClass($class);
             $defaultAlias = 1 === \count($interfaces) ? $interfaces[0] : null;
-            foreach ($r->getAttributes(AsAlias::class) as $attr) {
+            foreach ($r->getAttributes(AsAlias::class, \ReflectionAttribute::IS_INSTANCEOF) as $attr) {
                 /** @var AsAlias $attribute */
                 $attribute = $attr->newInstance();
                 $alias = $attribute->id ?? $defaultAlias;
diff --git a/Tests/Compiler/ServiceLocatorTagPassTest.php b/Tests/Compiler/ServiceLocatorTagPassTest.php
index 9a9306775..ad9c62d9b 100644
--- a/Tests/Compiler/ServiceLocatorTagPassTest.php
+++ b/Tests/Compiler/ServiceLocatorTagPassTest.php
@@ -83,7 +83,7 @@ public function testProcessValue()
         $this->assertSame(CustomDefinition::class, $locator('bar')::class);
         $this->assertSame(CustomDefinition::class, $locator('baz')::class);
         $this->assertSame(CustomDefinition::class, $locator('some.service')::class);
-        $this->assertSame(CustomDefinition::class, \get_class($locator('inlines.service')));
+        $this->assertSame(CustomDefinition::class, $locator('inlines.service')::class);
     }
 
     public function testServiceListIsOrdered()
diff --git a/Tests/Fixtures/PrototypeAsAlias/WithCustomAsAlias.php b/Tests/Fixtures/PrototypeAsAlias/WithCustomAsAlias.php
new file mode 100644
index 000000000..4f1419098
--- /dev/null
+++ b/Tests/Fixtures/PrototypeAsAlias/WithCustomAsAlias.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Symfony\Component\DependencyInjection\Tests\Fixtures\PrototypeAsAlias;
+
+use Symfony\Component\DependencyInjection\Attribute\AsAlias;
+
+#[AsProductionAlias(id: AliasFooInterface::class)]
+class WithCustomAsAlias
+{
+}
+
+#[\Attribute(\Attribute::TARGET_CLASS | \Attribute::IS_REPEATABLE)]
+final class AsProductionAlias extends AsAlias
+{
+    /**
+     * @param string|null         $id     The id of the alias
+     * @param bool                $public Whether to declare the alias public
+     */
+    public function __construct(
+        public ?string $id = null,
+        public bool $public = false,
+    ) {
+        parent::__construct($id, $public, ['prod']);
+    }
+}
diff --git a/Tests/Loader/FileLoaderTest.php b/Tests/Loader/FileLoaderTest.php
index 0ad1b363c..17bc228c7 100644
--- a/Tests/Loader/FileLoaderTest.php
+++ b/Tests/Loader/FileLoaderTest.php
@@ -45,6 +45,7 @@
 use Symfony\Component\DependencyInjection\Tests\Fixtures\PrototypeAsAlias\WithAsAliasInterface;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\PrototypeAsAlias\WithAsAliasMultiple;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\PrototypeAsAlias\WithAsAliasProdEnv;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\PrototypeAsAlias\WithCustomAsAlias;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\Utils\NotAService;
 
 class FileLoaderTest extends TestCase
@@ -368,6 +369,8 @@ public function testRegisterClassesWithAsAlias(string $resource, array $expected
     public static function provideResourcesWithAsAliasAttributes(): iterable
     {
         yield 'Private' => ['PrototypeAsAlias/{WithAsAlias,AliasFooInterface}.php', [AliasFooInterface::class => new Alias(WithAsAlias::class)]];
+        yield 'PrivateCustomAlias' => ['PrototypeAsAlias/{WithCustomAsAlias,AliasFooInterface}.php', [AliasFooInterface::class => new Alias(WithCustomAsAlias::class)], 'prod'];
+        yield 'PrivateCustomAliasNoMatch' => ['PrototypeAsAlias/{WithCustomAsAlias,AliasFooInterface}.php', [], 'dev'];
         yield 'Interface' => ['PrototypeAsAlias/{WithAsAliasInterface,AliasFooInterface}.php', [AliasFooInterface::class => new Alias(WithAsAliasInterface::class)]];
         yield 'Multiple' => ['PrototypeAsAlias/{WithAsAliasMultiple,AliasFooInterface}.php', [
             AliasFooInterface::class => new Alias(WithAsAliasMultiple::class, true),
diff --git a/composer.json b/composer.json
index 460751088..7b1e731b7 100644
--- a/composer.json
+++ b/composer.json
@@ -20,12 +20,12 @@
         "psr/container": "^1.1|^2.0",
         "symfony/deprecation-contracts": "^2.5|^3",
         "symfony/service-contracts": "^3.5",
-        "symfony/var-exporter": "^6.4.20|^7.2.5"
+        "symfony/var-exporter": "^6.4.20|^7.2.5|^8.0"
     },
     "require-dev": {
-        "symfony/yaml": "^6.4|^7.0",
-        "symfony/config": "^6.4|^7.0",
-        "symfony/expression-language": "^6.4|^7.0"
+        "symfony/yaml": "^6.4|^7.0|^8.0",
+        "symfony/config": "^6.4|^7.0|^8.0",
+        "symfony/expression-language": "^6.4|^7.0|^8.0"
     },
     "conflict": {
         "ext-psr": "<1.1|>=2",