diff -u b/hreflang.info.yml b/hreflang.info.yml
--- b/hreflang.info.yml
+++ b/hreflang.info.yml
@@ -1,4 +1,4 @@
-core_version_requirement: ^10.1 || ^11 || ^12
+core_version_requirement: ^8 || ^9 || ^10 || ^11 || ^12
 description: Automatically adds an hreflang tag to the page for each enabled language.
 name: Hreflang
 package: Multilingual
reverted:
--- b/hreflang.module
+++ a/hreflang.module
@@ -5,18 +5,87 @@
  * Adds hreflang link elements to the header of each page.
  */
 
+use Drupal\Core\Cache\CacheableMetadata;
-use Drupal\Core\Hook\Attribute\LegacyHook;
-use Drupal\hreflang\Hook\HreflangHooks;
 use Drupal\Core\Entity\ContentEntityInterface;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\Core\Url;
 
 /**
  * Implements hook_page_attachments().
  *
  * @phpstan-ignore missingType.iterableValue
  */
-#[LegacyHook]
 function hreflang_page_attachments(array &$page): void {
+  // No need to add hreflang tags for 404/403 pages.
+  if (Drupal::request()->attributes->has('exception')) {
+    return;
+  }
+
+  $config = Drupal::config('hreflang.settings');
+  $addXDefault = $config->get('x_default');
+  $is_front_page = Drupal::service('path.matcher')->isFrontPage();
+  if ($config->get('defer_to_content_translation') && $entity = hreflang_content_translation_get_entity()) {
+    if ($addXDefault) {
+      $translation = $entity->getUntranslated();
+      $access = $translation->access('view', NULL, TRUE);
+      if ($access->isAllowed()) {
+        $url = $is_front_page ? Url::fromRoute('<front>') : $entity->toUrl();
+        $page['#attached']['html_head_link'][] = [
+          [
+            'rel' => 'alternate',
+            'hreflang' => 'x-default',
+            'href' => $url
+              ->setOption('language', $translation->language())
+              ->setAbsolute()
+              ->toString(),
+          ],
+        ];
+      }
+      CacheableMetadata::createFromRenderArray($page)
+        ->addCacheableDependency($access)
+        ->applyTo($page);
+    }
+    return;
+  }
+
+  $language_manager = Drupal::languageManager();
+  if (!$language_manager->isMultilingual()) {
+    return;
+  }
+  $url = $is_front_page ? Url::fromRoute('<front>') : Url::fromRouteMatch(Drupal::routeMatch());
+  $links = $language_manager->getLanguageSwitchLinks(LanguageInterface::TYPE_INTERFACE, $url);
+  if (empty($links->links)) {
+    return;
+  }
+
+  // Adding x-default if option checked.
+  $defaultLanguageId = $language_manager->getDefaultLanguage()->getId();
+  if ($config->get('x_default_fallback')) {
+    $fallbackLanguageId = Drupal::config('language.negotiation')->get('selected_langcode');
+    if (isset($fallbackLanguageId) && $fallbackLanguageId !== LanguageInterface::LANGCODE_SITE_DEFAULT) {
+      $defaultLanguageId = $fallbackLanguageId;
+    }
+  }
+
+  foreach ($links->links as $langcode => $link) {
+    if (isset($link['url'])) {
+      $link['url']->setOptions($link);
+      $link['url']->setAbsolute();
+      $attributes = [
+        'rel' => 'alternate',
+        'hreflang' => NULL,
+        'href' => $link['url']->toString(),
+      ];
+      if ($addXDefault && $langcode === $defaultLanguageId) {
+        $attributes['hreflang'] = 'x-default';
+        $page['#attached']['html_head_link'][] = [$attributes];
+      }
+      $attributes['hreflang'] = $langcode;
+      $page['#attached']['html_head_link'][] = [$attributes];
+    }
+  }
+  // The hreflang tags include query args, so add the query args cache context.
+  $page['#cache']['contexts'][] = 'url.query_args';
-  \Drupal::service(HreflangHooks::class)->pageAttachments($page);
 }
 
 /**
@@ -62,7 +131,13 @@
  *
  * @phpstan-ignore missingType.iterableValue
  */
-#[LegacyHook]
 function hreflang_help(?string $route_name): array {
+  if ($route_name === 'hreflang.admin_settings' || $route_name === 'help.page.hreflang') {
+    return [
+      '#type' => 'html_tag',
+      '#tag' => 'p',
+      '#value' => t('Hreflang module automatically adds an hreflang tag to the page for each enabled language.'),
+    ];
+  }
+  return [];
-  return \Drupal::service(HreflangHooks::class)->help($route_name);
 }
reverted:
--- b/hreflang.services.yml
+++ a/hreflang.services.yml
@@ -5,7 +5,3 @@
     arguments: ['@cache_tags.invalidator', '@messenger']
     tags:
       - { name: event_subscriber }
-
-  Drupal\hreflang\Hook\HreflangHooks:
-    class: Drupal\hreflang\Hook\HreflangHooks
-    autowire: true
reverted:
--- b/src/Hook/HreflangHooks.php
+++ /dev/null
@@ -1,108 +0,0 @@
-<?php
-
-namespace Drupal\hreflang\Hook;
-
-use Drupal\Core\Language\LanguageInterface;
-use Drupal\Core\Cache\CacheableMetadata;
-use Drupal\Core\Url;
-use Drupal\Core\Hook\Attribute\Hook;
-use Drupal\Core\StringTranslation\StringTranslationTrait;
-
-/**
- * Hook implementations for hreflang.
- */
-class HreflangHooks {
-  use StringTranslationTrait;
-
-  /**
-   * Implements hook_page_attachments().
-   *
-   * @phpstan-ignore missingType.iterableValue
-   */
-  #[Hook('page_attachments')]
-  public static function pageAttachments(array &$page): void {
-    // No need to add hreflang tags for 404/403 pages.
-    if (\Drupal::request()->attributes->has('exception')) {
-      return;
-    }
-    $config = \Drupal::config('hreflang.settings');
-    $addXDefault = $config->get('x_default');
-    $is_front_page = \Drupal::service('path.matcher')->isFrontPage();
-    if ($config->get('defer_to_content_translation') && $entity = hreflang_content_translation_get_entity()) {
-      if ($addXDefault) {
-        $translation = $entity->getUntranslated();
-        $access = $translation->access('view', NULL, TRUE);
-        if ($access->isAllowed()) {
-          $url = $is_front_page ? Url::fromRoute('<front>') : $entity->toUrl();
-          $page['#attached']['html_head_link'][] = [
-                [
-                  'rel' => 'alternate',
-                  'hreflang' => 'x-default',
-                  'href' => $url->setOption('language', $translation->language())->setAbsolute()->toString(),
-                ],
-          ];
-        }
-        CacheableMetadata::createFromRenderArray($page)->addCacheableDependency($access)->applyTo($page);
-      }
-      return;
-    }
-    $language_manager = \Drupal::languageManager();
-    if (!$language_manager->isMultilingual()) {
-      return;
-    }
-    $url = $is_front_page ? Url::fromRoute('<front>') : Url::fromRouteMatch(\Drupal::routeMatch());
-    $links = $language_manager->getLanguageSwitchLinks(LanguageInterface::TYPE_INTERFACE, $url);
-    if (empty($links->links)) {
-      return;
-    }
-    // Adding x-default if option checked.
-    $defaultLanguageId = $language_manager->getDefaultLanguage()->getId();
-    if ($config->get('x_default_fallback')) {
-      $fallbackLanguageId = \Drupal::config('language.negotiation')->get('selected_langcode');
-      if (isset($fallbackLanguageId) && $fallbackLanguageId !== LanguageInterface::LANGCODE_SITE_DEFAULT) {
-        $defaultLanguageId = $fallbackLanguageId;
-      }
-    }
-    foreach ($links->links as $langcode => $link) {
-      if (isset($link['url'])) {
-        $link['url']->setOptions($link);
-        $link['url']->setAbsolute();
-        $attributes = [
-          'rel' => 'alternate',
-          'hreflang' => NULL,
-          'href' => $link['url']->toString(),
-        ];
-        if ($addXDefault && $langcode === $defaultLanguageId) {
-          $attributes['hreflang'] = 'x-default';
-          $page['#attached']['html_head_link'][] = [
-            $attributes,
-          ];
-        }
-        $attributes['hreflang'] = $langcode;
-        $page['#attached']['html_head_link'][] = [
-          $attributes,
-        ];
-      }
-    }
-    // The hreflang tags include query args, so add the query args cache context.
-    $page['#cache']['contexts'][] = 'url.query_args';
-  }
-
-  /**
-   * Implements hook_help().
-   *
-   * @phpstan-ignore missingType.iterableValue
-   */
-  #[Hook('help')]
-  public function help(?string $route_name): array {
-    if ($route_name === 'hreflang.admin_settings' || $route_name === 'help.page.hreflang') {
-      return [
-        '#type' => 'html_tag',
-        '#tag' => 'p',
-        '#value' => $this->t('Hreflang module automatically adds an hreflang tag to the page for each enabled language.'),
-      ];
-    }
-    return [];
-  }
-
-}