diff --git a/core/modules/update/lib/Drupal/update/UpdateFetcher.php b/core/modules/update/lib/Drupal/update/UpdateFetcher.php
index 6873045..f6177a1 100644
--- a/core/modules/update/lib/Drupal/update/UpdateFetcher.php
+++ b/core/modules/update/lib/Drupal/update/UpdateFetcher.php
@@ -8,7 +8,7 @@
 namespace Drupal\update;
 
 use Drupal\Core\Config\ConfigFactory;
-use Guzzle\Http\Client;
+use Guzzle\Http\ClientInterface;
 use Guzzle\Http\Exception\RequestException;
 
 /**
@@ -31,7 +31,7 @@ class UpdateFetcher {
   /**
    * The HTTP client to fetch the feed data with.
    *
-   * @var \Guzzle\Http\Client
+   * @var \Guzzle\Http\ClientInterface
    */
   protected $httpClient;
 
@@ -40,10 +40,10 @@ class UpdateFetcher {
    *
    * @param \Drupal\Core\Config\ConfigFactory $config_factory
    *   The config factory.
-   * @param \Guzzle\Http\Client $http_client
+   * @param \Guzzle\Http\ClientInterface $http_client
    *   A Guzzle client object.
    */
-  public function __construct(ConfigFactory $config_factory, Client $http_client) {
+  public function __construct(ConfigFactory $config_factory, ClientInterface $http_client) {
     $this->fetchUrl = $config_factory->get('update.settings')->get('fetch.url');
     $this->httpClient = $http_client;
   }