diff --git a/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.attach_library.html.twig b/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.attach_library.html.twig
index 0784ab918b3..dceaed8468a 100644
--- a/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.attach_library.html.twig
+++ b/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.attach_library.html.twig
@@ -1 +1 @@
-{{ attach_library('core/ckeditor') }}
+{{ attach_library('core/ckeditor5') }}
diff --git a/core/modules/system/tests/src/Functional/Theme/EngineTwigTest.php b/core/modules/system/tests/src/Functional/Theme/EngineTwigTest.php
index c358a92f74e..ea00a612f9b 100644
--- a/core/modules/system/tests/src/Functional/Theme/EngineTwigTest.php
+++ b/core/modules/system/tests/src/Functional/Theme/EngineTwigTest.php
@@ -144,7 +144,7 @@ class EngineTwigTest extends BrowserTestBase {
    */
   public function testTwigAttachLibrary() {
     $this->drupalGet('/twig-theme-test/attach-library');
-    $this->assertSession()->responseContains('ckeditor.js');
+    $this->assertSession()->responseContains('ckeditor5-dll.js');
   }
 
   /**