--- a/src/Api.php
+++ b/src/Api.php
@@ -5,7 +5,7 @@
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\Config\ConfigFactoryInterface;
 use Drupal\Core\Database\Connection;
-use Drupal\Core\Entity\EntityTypeManager;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\Core\Path\PathValidatorInterface;
 use Drupal\Core\Session\AccountInterface;
 use Drupal\editoria11y\Exception\Editoria11yApiException;
@@ -33,7 +33,7 @@
   /**
    * The manager property.
    */
-  protected EntityTypeManager $manager;
+  protected EntityTypeManagerInterface $manager;
 
   /**
    * The configuration factory.
@@ -56,14 +56,14 @@
    *   The current user.
    * @param \Drupal\Core\Database\Connection $connection
    *   The database connection.
-   * @param \Drupal\Core\Entity\EntityTypeManager $manager
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $manager
    *   The entity type manager.
    * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
    *   The configuration factory.
    * @param \Drupal\Core\Path\PathValidatorInterface $path_validator
    *   The path validator service.
    */
-  public function __construct(AccountInterface $account, Connection $connection, EntityTypeManager $manager, ConfigFactoryInterface $config_factory, PathValidatorInterface $path_validator) {
+  public function __construct(AccountInterface $account, Connection $connection, EntityTypeManagerInterface $manager, ConfigFactoryInterface $config_factory, PathValidatorInterface $path_validator) {
     $this->account = $account;
     $this->connection = $connection;
     $this->manager = $manager;