diff --git a/core/modules/system/language.api.php b/core/modules/system/language.api.php
index 9fe910a..d94c832 100644
--- a/core/modules/system/language.api.php
+++ b/core/modules/system/language.api.php
@@ -199,7 +199,7 @@ function hook_language_fallback_candidates_alter(array &$fallback_candidates) {
  * // Use the current default interface language.
  * $langcode = language(\Drupal\Core\Language\Language::TYPE_INTERFACE)->id;
  * // Instantiate the transliteration class.
- * $trans = drupal_container()->get('transliteration');
+ * $trans = Drupal::service('transliteration');
  * // Use this to transliterate some text.
  * $transformed = $trans->transliterate($string, $langcode);
  * @endcode
diff --git a/core/modules/system/lib/Drupal/system/Plugin/PluginUIBase.php b/core/modules/system/lib/Drupal/system/Plugin/PluginUIBase.php
index 077ee5b..d55ba0f 100644
--- a/core/modules/system/lib/Drupal/system/Plugin/PluginUIBase.php
+++ b/core/modules/system/lib/Drupal/system/Plugin/PluginUIBase.php
@@ -27,7 +27,7 @@ public function form($form, &$form_state) {
       $manager = new $plugin_definition['manager']();
     }
     else {
-      $manager = drupal_container()->get($plugin_definition['manager']);
+      $manager = \Drupal::service($plugin_definition['manager']);
     }
     $plugins = $manager->getDefinitions();
 
diff --git a/core/modules/system/lib/Drupal/system/Tests/Path/UrlAlterFunctionalTest.php b/core/modules/system/lib/Drupal/system/Tests/Path/UrlAlterFunctionalTest.php
index 6a782ed..723177b 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Path/UrlAlterFunctionalTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Path/UrlAlterFunctionalTest.php
@@ -112,7 +112,7 @@ protected function assertUrlOutboundAlter($original, $final) {
    *
    * @param $original
    *   A string with the aliased or un-normal path that is run through
-   *   drupal_container()->get('path.alias_manager')->getSystemPath().
+   *   \Drupal::service('path.alias_manager')->getSystemPath().
    * @param $final
    *   A string with the expected result after url().
    * @return
@@ -120,7 +120,7 @@ protected function assertUrlOutboundAlter($original, $final) {
    */
   protected function assertUrlInboundAlter($original, $final) {
     // Test inbound altering.
-    $result = drupal_container()->get('path.alias_manager')->getSystemPath($original);
+    $result = \Drupal::service('path.alias_manager')->getSystemPath($original);
     $this->assertIdentical($result, $final, format_string('Altered inbound URL %original, expected %final, and got %result.', array('%original' => $original, '%final' => $final, '%result' => $result)));
   }
 }
diff --git a/core/modules/system/lib/Drupal/system/Tests/Theme/TwigSettingsTest.php b/core/modules/system/lib/Drupal/system/Tests/Theme/TwigSettingsTest.php
index a764dc9..10c4d95 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Theme/TwigSettingsTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Theme/TwigSettingsTest.php
@@ -39,13 +39,13 @@ function testTwigAutoReloadOverride() {
     $this->rebuildContainer();
 
     // Check isAutoReload() via the Twig service container.
-    $this->assertTrue(drupal_container()->get('twig')->isAutoReload(), 'Automatic reloading of Twig templates enabled.');
+    $this->assertTrue(\Drupal::service('twig')->isAutoReload(), 'Automatic reloading of Twig templates enabled.');
 
     // Disable auto reload and check the service container again.
     $this->settingsSet('twig_auto_reload', FALSE);
     $this->rebuildContainer();
 
-    $this->assertFalse(drupal_container()->get('twig')->isAutoReload(), 'Automatic reloading of Twig templates disabled.');
+    $this->assertFalse(\Drupal::service('twig')->isAutoReload(), 'Automatic reloading of Twig templates disabled.');
   }
 
   /**
@@ -57,19 +57,19 @@ function testTwigDebugOverride() {
     $this->rebuildContainer();
 
     // Check isDebug() via the Twig service container.
-    $this->assertTrue(drupal_container()->get('twig')->isDebug(), 'Twig debug enabled.');
-    $this->assertTrue(drupal_container()->get('twig')->isAutoReload(), 'Twig automatic reloading is enabled when debug is enabled.');
+    $this->assertTrue(\Drupal::service('twig')->isDebug(), 'Twig debug enabled.');
+    $this->assertTrue(\Drupal::service('twig')->isAutoReload(), 'Twig automatic reloading is enabled when debug is enabled.');
 
     // Override auto reload when debug is enabled.
     $this->settingsSet('twig_auto_reload', FALSE);
     $this->rebuildContainer();
-    $this->assertFalse(drupal_container()->get('twig')->isAutoReload(), 'Twig automatic reloading can be disabled when debug is enabled.');
+    $this->assertFalse(\Drupal::service('twig')->isAutoReload(), 'Twig automatic reloading can be disabled when debug is enabled.');
 
     // Disable debug and check the service container again.
     $this->settingsSet('twig_debug', FALSE);
     $this->rebuildContainer();
 
-    $this->assertFalse(drupal_container()->get('twig')->isDebug(), 'Twig debug disabled.');
+    $this->assertFalse(\Drupal::service('twig')->isDebug(), 'Twig debug disabled.');
   }
 
   /**
@@ -94,7 +94,7 @@ function testTwigCacheOverride() {
     // Get the template filename and the cache filename for
     // theme_test.template_test.html.twig.
     $template_filename = $templates['theme_test_template_test']['path'] . '/' . $templates['theme_test_template_test']['template'] . $extension;
-    $cache_filename = drupal_container()->get('twig')->getCacheFilename($template_filename);
+    $cache_filename = \Drupal::service('twig')->getCacheFilename($template_filename);
 
     // Navigate to the page and make sure the template gets cached.
     $this->drupalGet('theme-test/template-test');
@@ -105,7 +105,7 @@ function testTwigCacheOverride() {
     $this->rebuildContainer();
 
     // This should return false after rebuilding the service container.
-    $new_cache_filename = drupal_container()->get('twig')->getCacheFilename($template_filename);
+    $new_cache_filename = \Drupal::service('twig')->getCacheFilename($template_filename);
     $this->assertFalse($new_cache_filename, 'Twig environment does not return cache filename after caching is disabled.');
   }
 
diff --git a/core/modules/system/lib/Drupal/system/Tests/Update/UpdateScriptTest.php b/core/modules/system/lib/Drupal/system/Tests/Update/UpdateScriptTest.php
index e7fa8e0..4316521 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Update/UpdateScriptTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Update/UpdateScriptTest.php
@@ -63,7 +63,7 @@ function testUpdateAccess() {
     // Access the update page as user 1.
     $user1 = user_load(1);
     $user1->pass_raw = user_password();
-    $user1->pass = drupal_container()->get('password')->hash(trim($user1->pass_raw));
+    $user1->pass = \Drupal::service('password')->hash(trim($user1->pass_raw));
     db_query("UPDATE {users} SET pass = :pass WHERE uid = :uid", array(':pass' => $user1->getPassword(), ':uid' => $user1->id()));
     $this->drupalLogin($user1);
     $this->drupalGet($this->update_url, array('external' => TRUE));
diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index 1935f5c..830cce4 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -963,7 +963,6 @@ function system_menu() {
       'route_name' => 'date_format_localize_reset',
     );
   }
-
   return $items;
 }
 
@@ -2256,7 +2255,7 @@ function system_page_build(&$page) {
  */
 function system_custom_theme() {
   if (drupal_container()->isScopeActive('request')) {
-    $request = drupal_container()->get('request');
+    $request = Drupal::request();
     $path = $request->attributes->get('_system_path');
     if (user_access('view the administration theme') && path_is_admin($path)) {
       return config('system.theme')->get('admin');
diff --git a/core/modules/system/tests/modules/design_test/design_test.module b/core/modules/system/tests/modules/design_test/design_test.module
index f69f961..35b8a73 100644
--- a/core/modules/system/tests/modules/design_test/design_test.module
+++ b/core/modules/system/tests/modules/design_test/design_test.module
@@ -95,7 +95,7 @@ function design_test_menu_local_tasks_alter(&$data, $router_item, $root_path) {
   if ($router_item['number_parts'] > 2 && strpos($root_path, 'design_test/') === 0) {
     $actions = &$data['actions']['output'];
     // Determine the currently selected theme, if any.
-    $selected_theme = drupal_container()->get('request')->query->get('theme');
+    $selected_theme = Drupal::request()->query->get('theme');
     $default_theme = config('system.theme')->get('default');
 
     // Expand all enabled themes into action links.
@@ -129,5 +129,5 @@ function design_test_menu_local_tasks_alter(&$data, $router_item, $root_path) {
  * query parameter. The returned value is validated by the menu system already.
  */
 function design_test_menu_theme_callback() {
-  return drupal_container()->get('request')->query->get('theme');
+  return Drupal::request()->query->get('theme');
 }