diff --git a/UPGRADE-3.0.md b/UPGRADE-3.0.md
index c6b343c96d8..947fa138fec 100644
--- a/UPGRADE-3.0.md
+++ b/UPGRADE-3.0.md
@@ -62,6 +62,11 @@ class MyLiveComponent {
         * Options `authReferrerPolicy`, `mapIds`, `channel`, `solutionChannel` have been added
         * Options `ìd`, `nonce`, `retries`, `url` have been removed
 
+## StimulusBundle
+
+* The Twig function `ux_controller_link_tags()` has been removed, which requires Symfony AssetMapper >=6.4,
+  run `composer require symfony/asset-mapper:>=6.4` if you don't have it installed yet.
+
 ## Swup
 
 * The package has been removed, see the [previous README](https://raw.githubusercontent.com/symfony/ux/refs/heads/2.x/src/Turbo/README.md)
diff --git a/src/StimulusBundle/CHANGELOG.md b/src/StimulusBundle/CHANGELOG.md
index 9b66e398bc0..778856eda5e 100644
--- a/src/StimulusBundle/CHANGELOG.md
+++ b/src/StimulusBundle/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 -   Minimum required Symfony version is now 6.4
 -   Minimum required PHP version is now 8.2
+-   Remove Twig function `ux_controller_link_tags()`, which requires Symfony AssetMapper >=6.4
 
 ## 2.30
 
diff --git a/src/StimulusBundle/composer.json b/src/StimulusBundle/composer.json
index 3043f6a8c84..b0c7378966d 100644
--- a/src/StimulusBundle/composer.json
+++ b/src/StimulusBundle/composer.json
@@ -21,6 +21,9 @@
         "twig/twig": "^2.15.3|^3.8",
         "symfony/deprecation-contracts": "^2.0|^3.0"
     },
+    "conflict": {
+        "symfony/asset-mapper": "<6.4"
+    },
     "require-dev": {
         "symfony/asset-mapper": "^6.4|^7.0|^8.0",
         "symfony/framework-bundle": "^6.4|^7.0|^8.0",
diff --git a/src/StimulusBundle/config/services.php b/src/StimulusBundle/config/services.php
index 239ce739441..36434998560 100644
--- a/src/StimulusBundle/config/services.php
+++ b/src/StimulusBundle/config/services.php
@@ -15,8 +15,6 @@
 use Symfony\UX\StimulusBundle\AssetMapper\StimulusLoaderJavaScriptCompiler;
 use Symfony\UX\StimulusBundle\Helper\StimulusHelper;
 use Symfony\UX\StimulusBundle\Twig\StimulusTwigExtension;
-use Symfony\UX\StimulusBundle\Twig\UxControllersTwigExtension;
-use Symfony\UX\StimulusBundle\Twig\UxControllersTwigRuntime;
 use Symfony\UX\StimulusBundle\Ux\UxPackageReader;
 use Twig\Environment;
 
@@ -45,17 +43,6 @@
             ])
 
         // symfony/asset-mapper services
-        ->set('stimulus.ux_controllers_twig_extension', UxControllersTwigExtension::class)
-            ->tag('twig.extension')
-
-        ->set('stimulus.ux_controllers_twig_runtime', UxControllersTwigRuntime::class)
-            ->args([
-                service('stimulus.asset_mapper.controllers_map_generator'),
-                service('asset_mapper'),
-                service('stimulus.asset_mapper.ux_package_reader'),
-                param('kernel.project_dir'),
-            ])
-            ->tag('twig.runtime')
 
         ->set('stimulus.asset_mapper.controllers_map_generator', ControllersMapGenerator::class)
             ->args([
diff --git a/src/StimulusBundle/doc/index.rst b/src/StimulusBundle/doc/index.rst
index 871eef39397..e5c938d4fb8 100644
--- a/src/StimulusBundle/doc/index.rst
+++ b/src/StimulusBundle/doc/index.rst
@@ -416,10 +416,6 @@ will import all your custom controllers as well as those from ``controllers.json
 It will also dynamically enable "debug" mode in Stimulus when your application
 is running in debug mode.
 
-.. tip::
-
-    For AssetMapper 6.3 only, you also need a ``{{ ux_controller_link_tags() }}``
-    in ``base.html.twig``. This is not needed in AssetMapper 6.4+.
 
 With WebpackEncoreBundle
 ~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/src/StimulusBundle/src/DependencyInjection/Compiler/RemoveAssetMapperServicesCompiler.php b/src/StimulusBundle/src/DependencyInjection/Compiler/RemoveAssetMapperServicesCompiler.php
index e805465dee8..98cc4fb101d 100644
--- a/src/StimulusBundle/src/DependencyInjection/Compiler/RemoveAssetMapperServicesCompiler.php
+++ b/src/StimulusBundle/src/DependencyInjection/Compiler/RemoveAssetMapperServicesCompiler.php
@@ -24,7 +24,6 @@ class RemoveAssetMapperServicesCompiler implements CompilerPassInterface
     public function process(ContainerBuilder $container): void
     {
         if (!$container->hasDefinition('asset_mapper')) {
-            $container->removeDefinition('stimulus.ux_controllers_twig_runtime');
             $container->removeDefinition('stimulus.asset_mapper.controllers_map_generator');
             $container->removeDefinition('stimulus.asset_mapper.loader_javascript_compiler');
         }
diff --git a/src/StimulusBundle/src/Twig/UxControllersTwigExtension.php b/src/StimulusBundle/src/Twig/UxControllersTwigExtension.php
deleted file mode 100644
index 02e409b4061..00000000000
--- a/src/StimulusBundle/src/Twig/UxControllersTwigExtension.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?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 Symfony\UX\StimulusBundle\Twig;
-
-use Twig\Extension\AbstractExtension;
-use Twig\TwigFunction;
-
-/**
- * @internal
- *
- * @author Ryan Weaver <ryan@symfonycasts.com>
- */
-final class UxControllersTwigExtension extends AbstractExtension
-{
-    public function getFunctions(): array
-    {
-        return [
-            new TwigFunction('ux_controller_link_tags', [UxControllersTwigRuntime::class, 'renderLinkTags'], ['is_safe' => ['html']]),
-        ];
-    }
-}
diff --git a/src/StimulusBundle/src/Twig/UxControllersTwigRuntime.php b/src/StimulusBundle/src/Twig/UxControllersTwigRuntime.php
deleted file mode 100644
index aacb0914faf..00000000000
--- a/src/StimulusBundle/src/Twig/UxControllersTwigRuntime.php
+++ /dev/null
@@ -1,171 +0,0 @@
-<?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 Symfony\UX\StimulusBundle\Twig;
-
-use Symfony\Component\AssetMapper\AssetMapperInterface;
-use Symfony\Component\AssetMapper\ImportMap\ImportMapGenerator;
-use Symfony\UX\StimulusBundle\AssetMapper\ControllersMapGenerator;
-use Symfony\UX\StimulusBundle\Ux\UxPackageReader;
-use Twig\Extension\RuntimeExtensionInterface;
-
-/**
- * Returns the link tags for all autoimported CSS files in controllers.json.
- *
- * @internal
- *
- * @author Ryan Weaver <ryan@symfonycasts.com>
- */
-final class UxControllersTwigRuntime implements RuntimeExtensionInterface
-{
-    private array $importMap;
-
-    public function __construct(
-        private ControllersMapGenerator $controllersMapGenerator,
-        private AssetMapperInterface $assetMapper,
-        private UxPackageReader $uxPackageReader,
-        private string $projectDir,
-    ) {
-    }
-
-    /**
-     * Returns the CSS <link> tags for all "autoimport" entries in controllers.json.
-     */
-    public function renderLinkTags(): string
-    {
-        if (class_exists(ImportMapGenerator::class)) {
-            trigger_deprecation('symfony/ux-stimulus-bundle', '2.13.0', 'Calling ux_controller_link_tags() is deprecated and does nothing with symfony/asset-mapper 6.4. The link tags are rendered automatically via the importmap() function.');
-
-            return '';
-        }
-
-        $controllersFile = $this->controllersMapGenerator->getControllersJsonPath();
-        if (!is_file($controllersFile)) {
-            return '';
-        }
-
-        $data = json_decode(file_get_contents($controllersFile), true, 512, \JSON_THROW_ON_ERROR);
-        $packages = $data['controllers'] ?? [];
-
-        $links = [];
-        foreach ($packages as $uxPackageName => $controllers) {
-            foreach ($controllers as $controllerData) {
-                if (!$controllerData['enabled'] ?? false) {
-                    continue;
-                }
-
-                foreach ($controllerData['autoimport'] ?? [] as $autoImport => $enabled) {
-                    if ($enabled) {
-                        $links[] = \sprintf('<link rel="stylesheet" href="%s">', $this->getLinkHref($autoImport, $uxPackageName));
-                    }
-                }
-            }
-        }
-
-        return implode("\n", $links);
-    }
-
-    // duplicated & adapted in ControllersMapGenerator
-    private function getLinkHref(string $autoImport, string $uxPackageName): string
-    {
-        // see if this is a mapped asset path
-        $asset = $this->assetMapper->getAsset($autoImport);
-        if ($asset) {
-            return $asset->publicPath;
-        }
-
-        $slashPosition = strpos($autoImport, '/');
-        if (false === $slashPosition) {
-            throw new \LogicException(\sprintf('The autoimport "%s" is not valid.', $autoImport));
-        }
-
-        // if the first character is @, then the package name is @symfony/ux-cropperjs
-        $parts = explode('/', $autoImport);
-        if (str_starts_with($autoImport, '@')) {
-            $package = implode('/', \array_slice($parts, 0, 2));
-            $file = implode('/', \array_slice($parts, 2));
-        } else {
-            $package = $parts[0];
-            $file = implode('/', \array_slice($parts, 1));
-        }
-
-        if ($package === $uxPackageName) {
-            // this is a file local to the ux package
-            $uxPackageMetadata = $this->uxPackageReader->readPackageMetadata($uxPackageName);
-            $filePath = $uxPackageMetadata->packageDirectory.'/'.$file;
-            if (!is_file($filePath)) {
-                throw new \LogicException(\sprintf('An "autoimport" in "%s" refers to "%s". This path could not be found in the asset mapper and the file "%s" does not exist in the package path "%s". And so, the file cannot be loaded.', $this->shortControllersPath(), $autoImport, $file, $uxPackageMetadata->packageDirectory));
-            }
-
-            $asset = $this->assetMapper->getAssetFromSourcePath($filePath);
-            if (!$asset) {
-                throw new \LogicException(\sprintf('An "autoimport" in "%s" refers to "%s". This file was found, but the path is not in the asset mapper. And so, the file cannot be loaded.', $this->shortControllersPath(), $autoImport));
-            }
-
-            return $asset->publicPath;
-        }
-
-        $importMap = $this->readImportMap();
-        if (!isset($importMap[$package])) {
-            throw new \LogicException(\sprintf('An "autoimport" in "%s" refers to "%s". This path could not be found in the asset mapper and no "%s" entry was found in importmap.php. And so, the file cannot be loaded.', $this->shortControllersPath(), $autoImport, $package));
-        }
-
-        $importMapEntry = $importMap[$package];
-        if (!isset($importMapEntry['url'])) {
-            throw new \LogicException(\sprintf('An "autoimport" in "%s" refers to "%s". This path could not be found in the asset mapper and no "url" key was found in importmap.php for the package "%s". And so, the file cannot be loaded.', $this->shortControllersPath(), $autoImport, $package));
-        }
-
-        $version = $this->parseVersionFromUrl($importMapEntry['url']);
-
-        return $this->getJsDelivrUrl($package, $version, $file);
-    }
-
-    private function readImportMap(): array
-    {
-        if (!isset($this->importMap)) {
-            // this should be dynamic, but for now, we'll hardcode it
-            $path = $this->projectDir.'/importmap.php';
-            $this->importMap = is_file($path) ? (static fn () => include $path)() : [];
-        }
-
-        return $this->importMap;
-    }
-
-    private function parseVersionFromUrl(string $url): ?string
-    {
-        $versionPattern = '/(?<=@)\d+(?:\.\d+)+/';
-        if (!preg_match($versionPattern, $url, $matches)) {
-            return null;
-        }
-
-        return $matches[0];
-    }
-
-    private function getJsDelivrUrl(string $package, ?string $version, string $file): string
-    {
-        $version ??= 'latest';
-        $package = str_replace('@', '', $package);
-
-        return \sprintf('https://cdn.jsdelivr.net/npm/%s@%s/%s', $package, $version, $file);
-    }
-
-    private function shortControllersPath(): string
-    {
-        $path = $this->controllersMapGenerator->getControllersJsonPath();
-        $path = realpath($path);
-        $projectDir = realpath($this->projectDir);
-        if (!str_starts_with($path, $projectDir)) {
-            return $path;
-        }
-
-        return str_replace($projectDir, '', $path);
-    }
-}
diff --git a/src/StimulusBundle/tests/AssetMapper/AutoImportLocatorTest.php b/src/StimulusBundle/tests/AssetMapper/AutoImportLocatorTest.php
index 78a3cc43a4f..6926f91f099 100644
--- a/src/StimulusBundle/tests/AssetMapper/AutoImportLocatorTest.php
+++ b/src/StimulusBundle/tests/AssetMapper/AutoImportLocatorTest.php
@@ -22,13 +22,6 @@
 
 class AutoImportLocatorTest extends TestCase
 {
-    protected function setUp(): void
-    {
-        if (!class_exists(ImportMapConfigReader::class)) {
-            $this->markTestSkipped('Test requires AssetMapper >= 6.4.');
-        }
-    }
-
     public function testLocateAutoImportCanHandleAssetMapperPath()
     {
         $assetMapper = $this->createMock(AssetMapperInterface::class);
diff --git a/src/StimulusBundle/tests/AssetMapper/ControllersMapGeneratorTest.php b/src/StimulusBundle/tests/AssetMapper/ControllersMapGeneratorTest.php
index 15004969447..0b75ddd3f8f 100644
--- a/src/StimulusBundle/tests/AssetMapper/ControllersMapGeneratorTest.php
+++ b/src/StimulusBundle/tests/AssetMapper/ControllersMapGeneratorTest.php
@@ -13,7 +13,6 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\AssetMapper\AssetMapperInterface;
-use Symfony\Component\AssetMapper\ImportMap\ImportMapConfigReader;
 use Symfony\Component\AssetMapper\MappedAsset;
 use Symfony\UX\StimulusBundle\AssetMapper\AutoImportLocator;
 use Symfony\UX\StimulusBundle\AssetMapper\ControllersMapGenerator;
@@ -54,17 +53,11 @@ public function testGetControllersMap()
         $packageReader = new UxPackageReader(__DIR__.'/../fixtures');
 
         $autoImportLocator = $this->createMock(AutoImportLocator::class);
-        if (class_exists(ImportMapConfigReader::class)) {
-            $autoImportLocator->expects($this->any())
-                ->method('locateAutoImport')
-                ->willReturnCallback(function ($path) {
-                    return new MappedControllerAutoImport('/path/to'.$path, false);
-                });
-        } else {
-            // @legacy for AssetMapper 6.3
-            $autoImportLocator->expects($this->never())
-                ->method('locateAutoImport');
-        }
+        $autoImportLocator->expects($this->any())
+            ->method('locateAutoImport')
+            ->willReturnCallback(function ($path) {
+                return new MappedControllerAutoImport('/path/to'.$path, false);
+            });
 
         $generator = new ControllersMapGenerator(
             $mapper,
@@ -106,11 +99,7 @@ public function testGetControllersMap()
         $this->assertSame('fake-vendor/ux-package1/package-controller-second.js', $controllerSecond->asset->logicalPath);
         // lazy from user's controller.json
         $this->assertTrue($controllerSecond->isLazy);
-        // @legacy: assert can be without the conditional for AssetMapper 6.4+
-        if (class_exists(ImportMapConfigReader::class)) {
-            // 4 auto imports from package.json
-            $this->assertCount(4, $controllerSecond->autoImports);
-        }
+        $this->assertCount(4, $controllerSecond->autoImports);
 
         $helloControllerFromPackage = $map['fake-vendor--ux-package2--hello-controller'];
         $this->assertSame('fake-vendor/ux-package2/package-hello-controller.js', $helloControllerFromPackage->asset->logicalPath);
diff --git a/src/StimulusBundle/tests/AssetMapper/StimulusControllerLoaderFunctionalTest.php b/src/StimulusBundle/tests/AssetMapper/StimulusControllerLoaderFunctionalTest.php
index 346fca2fa32..b1f110e0294 100644
--- a/src/StimulusBundle/tests/AssetMapper/StimulusControllerLoaderFunctionalTest.php
+++ b/src/StimulusBundle/tests/AssetMapper/StimulusControllerLoaderFunctionalTest.php
@@ -13,7 +13,6 @@
 
 use Composer\InstalledVersions;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
-use Symfony\Component\AssetMapper\ImportMap\ImportMapConfigReader;
 use Symfony\Component\Filesystem\Filesystem;
 use Symfony\UX\StimulusBundle\Tests\fixtures\StimulusTestKernel;
 use Zenstruck\Browser\Test\HasBrowser;
@@ -33,123 +32,79 @@ public function testFullApplicationLoad()
 
         $crawler = $this->browser()
             ->get('/')
-            ->crawler()
-        ;
+            ->crawler();
 
         $importMapJson = $crawler->filter('script[type="importmap"]')->html();
         $importMap = json_decode($importMapJson, true);
         $importMapKeys = array_keys($importMap['imports']);
 
-        if (class_exists(ImportMapConfigReader::class)) {
-            // filter out items ending in .css
-            $importMapJsKeys = array_filter($importMapKeys, function ($key) {
-                return '.css' !== substr($key, -4);
-            });
-            $importMapCssKeys = array_filter($importMapKeys, function ($key) {
-                return '.css' === substr($key, -4);
-            });
-            sort($importMapJsKeys);
-            $this->assertSame([
-                // 1x import from loader.js (which is aliased to @symfony/stimulus-bundle via importmap)
-                '/assets/@symfony/stimulus-bundle/controllers.js',
-                // 7x from "controllers" (hello is overridden)
-                '/assets/controllers/bye_controller.js',
-                '/assets/controllers/hello-with-dashes-controller.js',
-                '/assets/controllers/hello_with_underscores-controller.js',
-                '/assets/controllers/subdir/deeper-controller.js',
-                '/assets/controllers/subdir/deeper-with-dashes-controller.js',
-                '/assets/controllers/subdir/deeper_with_underscores-controller.js',
-                '/assets/controllers/typescript-controller.ts',
-                // 2x from UX packages, which are enabled in controllers.json
-                '/assets/fake-vendor/ux-package1/package-controller-second.js',
-                '/assets/fake-vendor/ux-package2/package-hello-controller.js',
-                // 4x from more-controllers
-                '/assets/more-controllers/excluded-controller.js',
-                '/assets/more-controllers/hello-controller.js',
-                '/assets/more-controllers/minified-controller.js',
-                '/assets/more-controllers/other-controller.js',
-                // 5x from importmap.php
-                '@hotwired/stimulus',
-                '@scoped/needed-vendor',
-                '@symfony/stimulus-bundle',
-                'app',
-                'needed-vendor',
-            ], array_values($importMapJsKeys));
+        // filter out items ending in .css
+        $importMapJsKeys = array_filter($importMapKeys, function ($key) {
+            return '.css' !== substr($key, -4);
+        });
+        $importMapCssKeys = array_filter($importMapKeys, function ($key) {
+            return '.css' === substr($key, -4);
+        });
+        sort($importMapJsKeys);
+        $this->assertSame([
+            // 1x import from loader.js (which is aliased to @symfony/stimulus-bundle via importmap)
+            '/assets/@symfony/stimulus-bundle/controllers.js',
+            // 7x from "controllers" (hello is overridden)
+            '/assets/controllers/bye_controller.js',
+            '/assets/controllers/hello-with-dashes-controller.js',
+            '/assets/controllers/hello_with_underscores-controller.js',
+            '/assets/controllers/subdir/deeper-controller.js',
+            '/assets/controllers/subdir/deeper-with-dashes-controller.js',
+            '/assets/controllers/subdir/deeper_with_underscores-controller.js',
+            '/assets/controllers/typescript-controller.ts',
+            // 2x from UX packages, which are enabled in controllers.json
+            '/assets/fake-vendor/ux-package1/package-controller-second.js',
+            '/assets/fake-vendor/ux-package2/package-hello-controller.js',
+            // 4x from more-controllers
+            '/assets/more-controllers/excluded-controller.js',
+            '/assets/more-controllers/hello-controller.js',
+            '/assets/more-controllers/minified-controller.js',
+            '/assets/more-controllers/other-controller.js',
+            // 5x from importmap.php
+            '@hotwired/stimulus',
+            '@scoped/needed-vendor',
+            '@symfony/stimulus-bundle',
+            'app',
+            'needed-vendor',
+        ], array_values($importMapJsKeys));
 
-            // the autoimport CSS
-            $this->assertSame([
-                '/assets/in/asset/mapper/controller_second1.css',
-                // enabled => false
-                // '/assets/in/asset/mapper/controller_second2.css',
-                '/assets/fake-vendor/ux-package1/styles.css',
+        // the autoimport CSS
+        $this->assertSame([
+            '/assets/in/asset/mapper/controller_second1.css',
+            // enabled => false
+            // '/assets/in/asset/mapper/controller_second2.css',
+            '/assets/fake-vendor/ux-package1/styles.css',
 
-                // 2x from importmap.php: so they should, of course, be here.
-                // But our compiler should not add "path-based" entries
-                // '/assets/vendor/needed-vendor/file.css',
-                // '/assets/vendor/@scoped/needed-vendor/the/file2.css',
-                'needed-vendor/file.css',
-                '@scoped/needed-vendor/the/file2.css',
-            ], array_values($importMapCssKeys));
+            // 2x from importmap.php: so they should, of course, be here.
+            // But our compiler should not add "path-based" entries
+            // '/assets/vendor/needed-vendor/file.css',
+            // '/assets/vendor/@scoped/needed-vendor/the/file2.css',
+            'needed-vendor/file.css',
+            '@scoped/needed-vendor/the/file2.css',
+        ], array_values($importMapCssKeys));
 
-            // "app" is the entry. So, all non-lazy controllers should be preloaded:
-            $preLoadHrefs = $crawler->filter('link[rel="modulepreload"]')->each(function ($link) {
-                return $link->attr('href');
-            });
-            $this->assertCount(12, $preLoadHrefs);
-            sort($preLoadHrefs);
-            $this->assertStringStartsWith('/assets/@symfony/stimulus-bundle/controllers-', $preLoadHrefs[0]);
-            $this->assertStringStartsWith('/assets/@symfony/stimulus-bundle/loader-', $preLoadHrefs[1]);
-            $this->assertStringStartsWith('/assets/controllers/hello-with-dashes-controller-', $preLoadHrefs[3]);
-            $this->assertStringStartsWith('/assets/controllers/hello_with_underscores-controller-', $preLoadHrefs[4]);
-            $this->assertStringStartsWith('/assets/controllers/subdir/deeper-controller-', $preLoadHrefs[5]);
-            $this->assertStringStartsWith('/assets/controllers/subdir/deeper-with-dashes-controller-', $preLoadHrefs[6]);
-            $this->assertStringStartsWith('/assets/controllers/subdir/deeper_with_underscores-controller-', $preLoadHrefs[7]);
-            $this->assertStringStartsWith('/assets/controllers/typescript-controller-', $preLoadHrefs[8]);
-            $this->assertStringStartsWith('/assets/fake-vendor/ux-package2/package-hello-controller-', $preLoadHrefs[9]);
-            $this->assertStringStartsWith('/assets/more-controllers/hello-controller-', $preLoadHrefs[10]);
-            $this->assertStringStartsWith('/assets/vendor/@hotwired/stimulus/stimulus.index', $preLoadHrefs[11]);
-        } else {
-            // legacy
-            $this->assertSame([
-                // 1x import from loader.js (which is aliased to @symfony/stimulus-bundle via importmap)
-                '/assets/@symfony/stimulus-bundle/controllers.js',
-                // 6x from "controllers" (hello is overridden)
-                '/assets/controllers/bye_controller.js',
-                '/assets/controllers/hello-with-dashes-controller.js',
-                '/assets/controllers/hello_with_underscores-controller.js',
-                '/assets/controllers/subdir/deeper-controller.js',
-                '/assets/controllers/subdir/deeper-with-dashes-controller.js',
-                '/assets/controllers/subdir/deeper_with_underscores-controller.js',
-                // 2x from UX packages, which are enabled in controllers.json
-                '/assets/fake-vendor/ux-package1/package-controller-second.js',
-                '/assets/fake-vendor/ux-package2/package-hello-controller.js',
-                // 2x from more-controllers
-                '/assets/more-controllers/hello-controller.js',
-                '/assets/more-controllers/other-controller.js',
-                // 5x from importmap.php
-                '@hotwired/stimulus',
-                '@scoped/needed-vendor',
-                '@symfony/stimulus-bundle',
-                'app',
-                'needed-vendor',
-            ], $importMapKeys);
-
-            // "app" & loader.js are pre-loaded. So, all non-lazy controllers should be preloaded:
-            $preLoadHrefs = $crawler->filter('link[rel="modulepreload"]')->each(function ($link) {
-                return $link->attr('href');
-            });
-            $this->assertCount(10, $preLoadHrefs);
-            sort($preLoadHrefs);
-            $this->assertStringStartsWith('/assets/@symfony/stimulus-bundle/controllers-', $preLoadHrefs[0]);
-            $this->assertStringStartsWith('/assets/@symfony/stimulus-bundle/loader-', $preLoadHrefs[1]);
-            $this->assertStringStartsWith('/assets/controllers/hello-with-dashes-controller-', $preLoadHrefs[2]);
-            $this->assertStringStartsWith('/assets/controllers/hello_with_underscores-controller-', $preLoadHrefs[3]);
-            $this->assertStringStartsWith('/assets/controllers/subdir/deeper-controller-', $preLoadHrefs[4]);
-            $this->assertStringStartsWith('/assets/controllers/subdir/deeper-with-dashes-controller-', $preLoadHrefs[5]);
-            $this->assertStringStartsWith('/assets/controllers/subdir/deeper_with_underscores-controller-', $preLoadHrefs[6]);
-            $this->assertStringStartsWith('/assets/fake-vendor/ux-package2/package-hello-controller-', $preLoadHrefs[7]);
-            $this->assertStringStartsWith('/assets/more-controllers/hello-controller-', $preLoadHrefs[8]);
-        }
+        // "app" is the entry. So, all non-lazy controllers should be preloaded:
+        $preLoadHrefs = $crawler->filter('link[rel="modulepreload"]')->each(function ($link) {
+            return $link->attr('href');
+        });
+        $this->assertCount(12, $preLoadHrefs);
+        sort($preLoadHrefs);
+        $this->assertStringStartsWith('/assets/@symfony/stimulus-bundle/controllers-', $preLoadHrefs[0]);
+        $this->assertStringStartsWith('/assets/@symfony/stimulus-bundle/loader-', $preLoadHrefs[1]);
+        $this->assertStringStartsWith('/assets/controllers/hello-with-dashes-controller-', $preLoadHrefs[3]);
+        $this->assertStringStartsWith('/assets/controllers/hello_with_underscores-controller-', $preLoadHrefs[4]);
+        $this->assertStringStartsWith('/assets/controllers/subdir/deeper-controller-', $preLoadHrefs[5]);
+        $this->assertStringStartsWith('/assets/controllers/subdir/deeper-with-dashes-controller-', $preLoadHrefs[6]);
+        $this->assertStringStartsWith('/assets/controllers/subdir/deeper_with_underscores-controller-', $preLoadHrefs[7]);
+        $this->assertStringStartsWith('/assets/controllers/typescript-controller-', $preLoadHrefs[8]);
+        $this->assertStringStartsWith('/assets/fake-vendor/ux-package2/package-hello-controller-', $preLoadHrefs[9]);
+        $this->assertStringStartsWith('/assets/more-controllers/hello-controller-', $preLoadHrefs[10]);
+        $this->assertStringStartsWith('/assets/vendor/@hotwired/stimulus/stimulus.index', $preLoadHrefs[11]);
     }
 
     protected static function getKernelClass(): string
diff --git a/src/StimulusBundle/tests/Twig/UxControllersTwigRuntimeTest.php b/src/StimulusBundle/tests/Twig/UxControllersTwigRuntimeTest.php
deleted file mode 100644
index fd507ae05b8..00000000000
--- a/src/StimulusBundle/tests/Twig/UxControllersTwigRuntimeTest.php
+++ /dev/null
@@ -1,93 +0,0 @@
-<?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 Symfony\UX\StimulusBundle\Tests\Twig;
-
-use PHPUnit\Framework\TestCase;
-use Symfony\Component\AssetMapper\AssetMapperInterface;
-use Symfony\Component\AssetMapper\ImportMap\ImportMapConfigReader;
-use Symfony\Component\AssetMapper\MappedAsset;
-use Symfony\UX\StimulusBundle\AssetMapper\ControllersMapGenerator;
-use Symfony\UX\StimulusBundle\Twig\UxControllersTwigRuntime;
-use Symfony\UX\StimulusBundle\Ux\UxPackageReader;
-
-class UxControllersTwigRuntimeTest extends TestCase
-{
-    /**
-     * @group legacy
-     */
-    public function testRenderLinkTags()
-    {
-        if (class_exists(ImportMapConfigReader::class)) {
-            $this->markTestSkipped('Skip test for AssetMapper 6.4+');
-        }
-
-        $controllersMapGenerator = $this->createMock(ControllersMapGenerator::class);
-        $controllersMapGenerator->expects($this->any())
-            ->method('getControllersJsonPath')
-            ->willReturn(__DIR__.'/../fixtures/assets/controllers.json')
-        ;
-
-        $assetMapper = $this->createMock(AssetMapperInterface::class);
-        $assetMapper->expects($this->any())
-            ->method('getAsset')
-            ->willReturnCallback(function ($path) {
-                if (str_starts_with($path, 'in/asset/mapper')) {
-                    return new MappedAsset(basename($path), publicPath: '/assets/mapper/'.basename($path));
-                }
-
-                if (str_starts_with($path, '@fake-vendor/ux-package1')) {
-                    return new MappedAsset('fake-vendor/ux-package1/'.basename($path), publicPath: '/assets/@fake-vendor/ux-package1/'.basename($path));
-                }
-
-                return null;
-            });
-
-        $runtime = new UxControllersTwigRuntime(
-            $controllersMapGenerator,
-            $assetMapper,
-            new UxPackageReader(__DIR__.'/../fixtures'),
-            __DIR__.'/../fixtures/legacy'
-        );
-
-        $this->assertStringNotContainsString(
-            'controller_first.css',
-            $runtime->renderLinkTags()
-        );
-        $this->assertStringContainsString(
-            'href="/assets/mapper/controller_second1.css"',
-            $runtime->renderLinkTags()
-        );
-        $this->assertStringNotContainsString(
-            'controller_second2.css',
-            $runtime->renderLinkTags()
-        );
-        $this->assertStringContainsString(
-            'href="/assets/@fake-vendor/ux-package1/styles.css"',
-            $runtime->renderLinkTags()
-        );
-        $this->assertStringContainsString(
-            'href="https://cdn.jsdelivr.net/npm/needed-vendor@3.2.0/file.css"',
-            $runtime->renderLinkTags()
-        );
-        $this->assertStringContainsString(
-            'href="https://cdn.jsdelivr.net/npm/scoped/needed-vendor@1.2.3/the/file2.css"',
-            $runtime->renderLinkTags()
-        );
-
-        // loop through a controllers.json file with several autoimports
-        // cases for the assets:
-        //   1) asset path is in the pipeline
-        //   2) path starts with the "package name" (try with scoped and non-scoped)
-        //      then look right inside the package
-        //   3) look inside importmap.php for a "url" package and map to jsdelivr
-    }
-}
diff --git a/src/StimulusBundle/tests/fixtures/StimulusTestKernel.php b/src/StimulusBundle/tests/fixtures/StimulusTestKernel.php
index ff8337f2ae6..16bf388bf72 100644
--- a/src/StimulusBundle/tests/fixtures/StimulusTestKernel.php
+++ b/src/StimulusBundle/tests/fixtures/StimulusTestKernel.php
@@ -15,7 +15,6 @@
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
 use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
 use Symfony\Bundle\TwigBundle\TwigBundle;
-use Symfony\Component\AssetMapper\ImportMap\ImportMapConfigReader;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
 use Symfony\Component\HttpFoundation\Response;
@@ -60,7 +59,7 @@ protected function configureContainer(ContainerConfigurator $container): void
                     __DIR__.'/vendor/fake-vendor/ux-package2/Resources/assets/dist' => 'fake-vendor/ux-package2',
                 ],
                 // @legacy
-                'importmap_path' => '%kernel.project_dir%/'.(class_exists(ImportMapConfigReader::class) ? 'importmap.php' : 'legacy/importmap.php'),
+                'importmap_path' => '%kernel.project_dir%/importmap.php',
             ],
             'test' => true,
             ...(self::VERSION_ID >= 60200 ? [
diff --git a/src/StimulusBundle/tests/fixtures/legacy/importmap.php b/src/StimulusBundle/tests/fixtures/legacy/importmap.php
deleted file mode 100644
index 998ee44649c..00000000000
--- a/src/StimulusBundle/tests/fixtures/legacy/importmap.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?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.
- */
-
-// @legacy for AssetMapper 6.3 support
-return [
-    'app' => [
-        'path' => 'app.js',
-        'entrypoint' => true,
-    ],
-    '@hotwired/stimulus' => [
-        'url' => 'https://ga.jspm.io/npm:@hotwired/stimulus@3.2.1/dist/stimulus.js',
-    ],
-    '@symfony/stimulus-bundle' => [
-        'path' => '@symfony/stimulus-bundle/loader.js',
-    ],
-    'needed-vendor' => [
-        'url' => 'https://cdn.jsdelivr.net/npm/needed-vendor@3.2.0/dist/needed-vendor+esm',
-    ],
-    '@scoped/needed-vendor' => [
-        'url' => 'https://cdn.jsdelivr.net/npm/@scoped/needed-vendor@1.2.3',
-    ],
-];