diff --git a/core/modules/update/src/Tests/UpdateTestBase.php b/core/modules/update/src/Tests/UpdateTestBase.php
index 1b1c9f6..ee21003 100644
--- a/core/modules/update/src/Tests/UpdateTestBase.php
+++ b/core/modules/update/src/Tests/UpdateTestBase.php
@@ -32,16 +32,16 @@
   /**
    * Refreshes the update status based on the desired available update scenario.
    *
-   * @param $xml_map
+   * @param array $xml_map
    *   Array that maps project names to availability scenarios to fetch. The key
    *   '#all' is used if a project-specific mapping is not defined.
-   * @param $url
+   * @param string $url
    *   (optional) A string containing the URL to fetch update data from.
    *   Defaults to 'update-test'.
    *
    * @see update_test_mock_page()
    */
-  protected function refreshUpdateStatus($xml_map, $url = 'update-test') {
+  protected function refreshUpdateStatus(array $xml_map, $url = 'update-test') {
     // Tell the Update Manager module to fetch from the URL provided by
     // update_test module.
     $this->config('update.settings')->set('fetch.url', _url($url, array('absolute' => TRUE)))->save();
diff --git a/core/modules/update/src/UpdateFetcherInterface.php b/core/modules/update/src/UpdateFetcherInterface.php
index 8ace958..0cc5078 100644
--- a/core/modules/update/src/UpdateFetcherInterface.php
+++ b/core/modules/update/src/UpdateFetcherInterface.php
@@ -22,7 +22,7 @@
    *   not include the path elements to specify a particular project, version,
    *   site_key, etc.
    */
-  public function getFetchBaseUrl($project);
+  public function getFetchBaseUrl(array $project);
 
   /**
    * Retrieves the project information.
diff --git a/core/modules/update/src/UpdateManagerInterface.php b/core/modules/update/src/UpdateManagerInterface.php
index 8c1ab56..bad98a1 100644
--- a/core/modules/update/src/UpdateManagerInterface.php
+++ b/core/modules/update/src/UpdateManagerInterface.php
@@ -68,7 +68,7 @@ public function getProjects();
    * @param array $context
    *   Reference to an array used for Batch API storage.
    */
-  public function fetchDataBatch(&$context);
+  public function fetchDataBatch(array &$context);
 
   /**
    * Clears out all the available update data and initiates re-fetching.
diff --git a/core/modules/update/src/UpdateProcessorInterface.php b/core/modules/update/src/UpdateProcessorInterface.php
index d41a57e..b47671c 100644
--- a/core/modules/update/src/UpdateProcessorInterface.php
+++ b/core/modules/update/src/UpdateProcessorInterface.php
@@ -46,7 +46,7 @@ public function fetchData();
    * @see \Drupal\update\UpdateProcessor::fetchData()
    * @see \Drupal\update\UpdateProcessor::processFetchTask()
    */
-  public function createFetchTask($project);
+  public function createFetchTask(array $project);
 
   /**
    * Processes a task to fetch available update data for a single project.
@@ -60,7 +60,7 @@ public function createFetchTask($project);
    * @return bool
    *   TRUE if we fetched parsable XML, otherwise FALSE.
    */
-  public function processFetchTask($project);
+  public function processFetchTask(array $project);
 
   /**
    * Retrieves the number of items in the update fetch queue.
@@ -80,5 +80,5 @@ public function numberOfQueueItems();
    *
    * @see \Drupal\Core\Queue\QueueInterface::deleteItem()
    */
-  public function deleteQueueItem($item);
+  public function deleteQueueItem(\stdClass $item);
 }
diff --git a/core/modules/update/tests/modules/update_test/update_test.module b/core/modules/update/tests/modules/update_test/update_test.module
index 93c97f4..e6bf365 100644
--- a/core/modules/update/tests/modules/update_test/update_test.module
+++ b/core/modules/update/tests/modules/update_test/update_test.module
@@ -1,14 +1,14 @@
 <?php
 
-use Drupal\Core\Extension\Extension;
-use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\HttpFoundation\BinaryFileResponse;
-
 /**
  * @file
  * Module for testing Update Manager functionality.
  */
 
+use Drupal\Core\Extension\Extension;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpFoundation\BinaryFileResponse;
+
 /**
  * Implements hook_system_info_alter().
  *
@@ -67,7 +67,7 @@ function update_test_update_status_alter(&$projects) {
  * the 'update_test_xml_map' variable as an array, keyed by project name,
  * indicating which availability scenario to use for that project.
  *
- * @param $project_name
+ * @param string $project_name
  *   The project short name the update manager is trying to fetch data for (the
  *   fetch URLs are of the form: [base_url]/[project_name]/[core_version]).
  *
diff --git a/core/modules/update/tests/src/Unit/Menu/UpdateLocalTasksTest.php b/core/modules/update/tests/src/Unit/Menu/UpdateLocalTasksTest.php
index b82ec79..2d2a92a 100644
--- a/core/modules/update/tests/src/Unit/Menu/UpdateLocalTasksTest.php
+++ b/core/modules/update/tests/src/Unit/Menu/UpdateLocalTasksTest.php
@@ -16,6 +16,9 @@
  */
 class UpdateLocalTasksTest extends LocalTaskIntegrationTest {
 
+  /**
+   * {@inheritdoc}
+   */
   protected function setUp() {
     $this->directoryList = array('update' => 'core/modules/update');
     parent::setUp();
diff --git a/core/modules/update/tests/src/Unit/UpdateFetcherTest.php b/core/modules/update/tests/src/Unit/UpdateFetcherTest.php
index 38bbb7d..fae083c 100644
--- a/core/modules/update/tests/src/Unit/UpdateFetcherTest.php
+++ b/core/modules/update/tests/src/Unit/UpdateFetcherTest.php
@@ -47,7 +47,7 @@ protected function setUp() {
    * @param string $site_key
    *   A string to mimic an anonymous site key hash.
    * @param string $expected
-   *   The expected url returned from UpdateFetcher::buildFetchUrl()
+   *   The expected url returned from UpdateFetcher::buildFetchUrl().
    *
    * @dataProvider providerTestUpdateBuildFetchUrl
    *