diff --git a/core/modules/update/src/UpdateManager.php b/core/modules/update/src/UpdateManager.php
index 0652430..e652227 100644
--- a/core/modules/update/src/UpdateManager.php
+++ b/core/modules/update/src/UpdateManager.php
@@ -175,7 +175,7 @@ public function projectStorage($key) {
   /**
    * {@inheritdoc}
    */
-  public function fetchDataBatch(&$context) {
+  public function fetchDataBatch(array &$context) {
     if (empty($context['sandbox']['max'])) {
       $context['finished'] = 0;
       $context['sandbox']['max'] = $this->updateProcessor->numberOfQueueItems();
diff --git a/core/modules/update/src/UpdateProcessor.php b/core/modules/update/src/UpdateProcessor.php
index d37f643..2b7c3ba 100644
--- a/core/modules/update/src/UpdateProcessor.php
+++ b/core/modules/update/src/UpdateProcessor.php
@@ -115,7 +115,7 @@ public function __construct(ConfigFactoryInterface $config_factory, QueueFactory
   /**
    * {@inheritdoc}
    */
-  public function createFetchTask($project) {
+  public function createFetchTask(array $project) {
     if (empty($this->fetchTasks)) {
       $this->fetchTasks = $this->fetchTaskStore->getAll();
     }
@@ -140,7 +140,7 @@ public function fetchData() {
   /**
    * {@inheritdoc}
    */
-  public function processFetchTask($project) {
+  public function processFetchTask(array $project) {
     global $base_url;
 
     // This can be in the middle of a long-running batch, so REQUEST_TIME won't
@@ -265,7 +265,7 @@ public function claimQueueItem() {
   /**
    * {@inheritdoc}
    */
-  public function deleteQueueItem($item) {
+  public function deleteQueueItem(\stdClass $item) {
     return $this->fetchQueue->deleteItem($item);
   }