diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 385f128c7c5..33b1769f462 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -1528,7 +1528,7 @@ function template_preprocess_field(&$variables, $hook) {
 
   static $default_attributes;
   if (!isset($default_attributes)) {
-    $default_attributes = new Attribute;
+    $default_attributes = new Attribute();
   }
 
   // Merge attributes when a single-value field has a hidden label.
diff --git a/core/lib/Drupal/Component/Gettext/PoStreamReader.php b/core/lib/Drupal/Component/Gettext/PoStreamReader.php
index dbd06d1eb86..faaa95f91a8 100644
--- a/core/lib/Drupal/Component/Gettext/PoStreamReader.php
+++ b/core/lib/Drupal/Component/Gettext/PoStreamReader.php
@@ -219,7 +219,7 @@ class PoStreamReader implements PoStreamInterface, PoReaderInterface {
     if (!$item) {
       return;
     }
-    $header = new PoHeader;
+    $header = new PoHeader();
     $header->setFromString(trim($item->getTranslation()));
     $this->_header = $header;
   }
diff --git a/core/lib/Drupal/Core/Controller/ControllerResolver.php b/core/lib/Drupal/Core/Controller/ControllerResolver.php
index a8fad7479c3..d16b48da3e9 100644
--- a/core/lib/Drupal/Core/Controller/ControllerResolver.php
+++ b/core/lib/Drupal/Core/Controller/ControllerResolver.php
@@ -68,7 +68,7 @@ class ControllerResolver extends BaseControllerResolver implements ControllerRes
         return $controller;
       }
       elseif (method_exists($controller, '__invoke')) {
-        return new $controller;
+        return new $controller();
       }
     }
 
diff --git a/core/lib/Drupal/Core/DrupalKernel.php b/core/lib/Drupal/Core/DrupalKernel.php
index fce9f0900ee..b41a91d49e8 100644
--- a/core/lib/Drupal/Core/DrupalKernel.php
+++ b/core/lib/Drupal/Core/DrupalKernel.php
@@ -1208,7 +1208,7 @@ class DrupalKernel implements DrupalKernelInterface, TerminableInterface {
     foreach ($this->serviceProviderClasses as $origin => $classes) {
       foreach ($classes as $name => $class) {
         if (!is_object($class)) {
-          $this->serviceProviders[$origin][$name] = new $class;
+          $this->serviceProviders[$origin][$name] = new $class();
         }
         else {
           $this->serviceProviders[$origin][$name] = $class;
diff --git a/core/modules/migrate/src/Plugin/Migration.php b/core/modules/migrate/src/Plugin/Migration.php
index 2f1154d699c..9b22e359fae 100644
--- a/core/modules/migrate/src/Plugin/Migration.php
+++ b/core/modules/migrate/src/Plugin/Migration.php
@@ -416,7 +416,7 @@ class Migration extends PluginBase implements MigrationInterface, RequirementsIn
    */
   public function getDestinationPlugin($stub_being_requested = FALSE) {
     if ($stub_being_requested && !empty($this->destination['no_stub'])) {
-      throw new MigrateSkipRowException;
+      throw new MigrateSkipRowException();
     }
     if (!isset($this->destinationPlugin)) {
       $this->destinationPlugin = $this->destinationPluginManager->createInstance($this->destination['plugin'], $this->destination, $this);
diff --git a/core/modules/migrate/src/Plugin/migrate/process/MenuLinkParent.php b/core/modules/migrate/src/Plugin/migrate/process/MenuLinkParent.php
index c7a0472ca67..0cb7c68a8d3 100644
--- a/core/modules/migrate/src/Plugin/migrate/process/MenuLinkParent.php
+++ b/core/modules/migrate/src/Plugin/migrate/process/MenuLinkParent.php
@@ -97,7 +97,7 @@ class MenuLinkParent extends ProcessPluginBase implements ContainerFactoryPlugin
         }
       }
     }
-    throw new MigrateSkipRowException;
+    throw new MigrateSkipRowException();
   }
 
 }
diff --git a/core/modules/simpletest/tests/src/Unit/SimpletestPhpunitRunCommandTest.php b/core/modules/simpletest/tests/src/Unit/SimpletestPhpunitRunCommandTest.php
index 0e3d2a497b3..4a3d2524145 100644
--- a/core/modules/simpletest/tests/src/Unit/SimpletestPhpunitRunCommandTest.php
+++ b/core/modules/simpletest/tests/src/Unit/SimpletestPhpunitRunCommandTest.php
@@ -19,7 +19,7 @@ class SimpletestPhpunitRunCommandTest extends UnitTestCase {
     include_once __DIR__ .'/../../fixtures/simpletest_phpunit_run_command_test.php';
     $app_root = __DIR__ . '/../../../../../..';
     include_once "$app_root/core/modules/simpletest/simpletest.module";
-    $container = new ContainerBuilder;
+    $container = new ContainerBuilder();
     $container->set('app.root', $app_root);
     $file_system = $this->prophesize('Drupal\Core\File\FileSystemInterface');
     $file_system->realpath('public://simpletest')->willReturn(sys_get_temp_dir());
diff --git a/core/modules/system/tests/modules/system_test/src/MockFileTransfer.php b/core/modules/system/tests/modules/system_test/src/MockFileTransfer.php
index 63500417cb0..9e716002a7a 100644
--- a/core/modules/system/tests/modules/system_test/src/MockFileTransfer.php
+++ b/core/modules/system/tests/modules/system_test/src/MockFileTransfer.php
@@ -14,7 +14,7 @@ class MockFileTransfer {
    *   A new Drupal\system_test\MockFileTransfer object.
    */
   public static function factory() {
-    return new MockFileTransfer;
+    return new MockFileTransfer();
   }
 
   /**
diff --git a/core/modules/update/tests/modules/update_test/src/MockFileTransfer.php b/core/modules/update/tests/modules/update_test/src/MockFileTransfer.php
index 1f73b1cad33..9e40b65e5c8 100644
--- a/core/modules/update/tests/modules/update_test/src/MockFileTransfer.php
+++ b/core/modules/update/tests/modules/update_test/src/MockFileTransfer.php
@@ -14,7 +14,7 @@ class MockFileTransfer {
    *   A new Drupal\update_test\MockFileTransfer object.
    */
   public static function factory() {
-    return new FileTransfer;
+    return new FileTransfer();
   }
 
   /**
diff --git a/core/phpcs.xml.dist b/core/phpcs.xml.dist
index 34c0ef99295..ab2081d0207 100644
--- a/core/phpcs.xml.dist
+++ b/core/phpcs.xml.dist
@@ -12,6 +12,7 @@
 
   <!-- Only include specific sniffs that pass. This ensures that, if new sniffs are added, HEAD does not fail.-->
   <!-- Drupal sniffs -->
+  <rule ref="Drupal.Classes.ClassCreateInstance"/>
   <rule ref="Drupal.Classes.UnusedUseStatement"/>
   <rule ref="Drupal.CSS.ClassDefinitionNameSpacing"/>
   <rule ref="Drupal.CSS.ColourDefinition"/>
diff --git a/core/tests/Drupal/Tests/Core/Template/AttributeTest.php b/core/tests/Drupal/Tests/Core/Template/AttributeTest.php
index fd0ead9e54f..09ec9894dcc 100644
--- a/core/tests/Drupal/Tests/Core/Template/AttributeTest.php
+++ b/core/tests/Drupal/Tests/Core/Template/AttributeTest.php
@@ -435,7 +435,7 @@ class AttributeTest extends UnitTestCase {
    *   The number of results that are found.
    */
   protected function getXPathResultCount($query, $html) {
-    $document = new \DOMDocument;
+    $document = new \DOMDocument();
     $document->loadHTML($html);
     $xpath = new \DOMXPath($document);
 
diff --git a/core/tests/Drupal/Tests/Core/Utility/LinkGeneratorTest.php b/core/tests/Drupal/Tests/Core/Utility/LinkGeneratorTest.php
index 89cf62ceafa..97fb9d3b314 100644
--- a/core/tests/Drupal/Tests/Core/Utility/LinkGeneratorTest.php
+++ b/core/tests/Drupal/Tests/Core/Utility/LinkGeneratorTest.php
@@ -519,7 +519,7 @@ class LinkGeneratorTest extends UnitTestCase {
     }
 
     // Execute the query.
-    $document = new \DOMDocument;
+    $document = new \DOMDocument();
     $document->loadHTML($html);
     $xpath = new \DOMXPath($document);
 
@@ -538,7 +538,7 @@ class LinkGeneratorTest extends UnitTestCase {
    *   The number of results that are found.
    */
   protected function assertNoXPathResults($query, $html) {
-    $document = new \DOMDocument;
+    $document = new \DOMDocument();
     $document->loadHTML($html);
     $xpath = new \DOMXPath($document);