diff -u b/core/modules/ckeditor/src/Plugin/Editor/CKEditor.php b/core/modules/ckeditor/src/Plugin/Editor/CKEditor.php
--- b/core/modules/ckeditor/src/Plugin/Editor/CKEditor.php
+++ b/core/modules/ckeditor/src/Plugin/Editor/CKEditor.php
@@ -13,7 +13,7 @@
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Language\LanguageManagerInterface;
 use Drupal\Core\Render\Element;
-use Drupal\Core\Render\Renderer;
+use Drupal\Core\Render\RendererInterface;
 use Drupal\editor\Plugin\EditorBase;
 use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
 use Drupal\editor\Entity\Editor as EditorEntity;
@@ -57,9 +57,9 @@
   protected $ckeditorPluginManager;
 
   /**
-   * Rendering service.
+   * The renderer service.
    *
-   * @var \Drupal\Core\Render\Renderer
+   * @var \Drupal\Core\Render\RendererInterface
    */
   protected $renderer;
 
@@ -78,10 +78,10 @@
    *   The module handler to invoke hooks on.
    * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
    *   The language manager.
-   * @param \Drupal\Core\Render\Renderer $renderer
+   * @param \Drupal\Core\Render\RendererInterface $renderer
    *   The renderer service.
    */
-  public function __construct(array $configuration, $plugin_id, $plugin_definition, CKEditorPluginManager $ckeditor_plugin_manager, ModuleHandlerInterface $module_handler, LanguageManagerInterface $language_manager, Renderer $renderer) {
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, CKEditorPluginManager $ckeditor_plugin_manager, ModuleHandlerInterface $module_handler, LanguageManagerInterface $language_manager, RendererInterface $renderer) {
     parent::__construct($configuration, $plugin_id, $plugin_definition);
     $this->ckeditorPluginManager = $ckeditor_plugin_manager;
     $this->moduleHandler = $module_handler;