reverted:
--- b/advanced_page_cache.info.yml
+++ a/advanced_page_cache.info.yml
@@ -1,7 +1,7 @@
 name: Advanced Internal Page Cache
 description: 'Allows to extend the caching of pages for anonymous users.'
 type: module
+core_version_requirement: ^9 || ^10
-core_version_requirement: ^9 || ^10 || ^11
 package: 'Performance and scalability'
 dependencies:
   - drupal:page_cache
reverted:
--- b/composer.json
+++ a/composer.json
@@ -16,6 +16,6 @@
         "source": "https://git.drupalcode.org/project/advanced_page_cache"
     },
     "require": {
+        "drupal/core": "^9 || ^10"
-        "drupal/core": "^9 || ^10 || ^11"
     }
 }
only in patch2:
unchanged:
--- a/tests/modules/src/Form/TestForm.php
+++ b/tests/modules/src/Form/TestForm.php
@@ -40,7 +40,7 @@ class TestForm extends FormBase {
    */
   public function submitForm(array &$form, FormStateInterface $form_state) {
     $response = new LocalRedirectResponse($this->getRequest()->query->get('destination'));
-    $response->headers->setCookie(new Cookie($form['cookie']['#value'], TRUE, 0, '/', NULL, FALSE, FALSE));
+    $response->headers->setCookie(\Symfony\Component\HttpFoundation\Cookie::create($form['cookie']['#value'], TRUE, 0, '/', NULL, FALSE, FALSE));
   }
 
 }
\ No newline at end of file
only in patch2:
unchanged:
--- a/tests/src/Functional/CookiePageCacheTest.php
+++ b/tests/src/Functional/CookiePageCacheTest.php
@@ -18,12 +18,22 @@ use Drupal\user\RoleInterface;
  */
 class CookiePageCacheTest extends BrowserTestBase {
 
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stark';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stark';
+
   use AssertPageCacheContextsAndTagsTrait;
 
   /**
    * {@inheritdoc}
    */
-  protected function setUp() {
+  protected function setUp(): void {
     parent::setUp();
   }