diff --git a/core/modules/system/lib/Drupal/system/Tests/KeyValueStore/GarbageCollectionTest.php b/core/modules/system/lib/Drupal/system/Tests/KeyValueStore/GarbageCollectionTest.php
index 2835a47..3e20c99 100644
--- a/core/modules/system/lib/Drupal/system/Tests/KeyValueStore/GarbageCollectionTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/KeyValueStore/GarbageCollectionTest.php
@@ -9,6 +9,7 @@
 
 use Drupal\Core\Database\Database;
 use Drupal\Core\KeyValueStore\DatabaseStorageExpirable;
+use Drupal\Core\Serialization\PhpSerialize;
 use Drupal\simpletest\UnitTestBase;
 
 /**
@@ -41,7 +42,7 @@ protected function tearDown() {
    */
   public function testGarbageCollection() {
     $collection = $this->randomName();
-    $store = new DatabaseStorageExpirable($collection, Database::getConnection());
+    $store = new DatabaseStorageExpirable($collection, new PhpSerialize(), Database::getConnection());
 
     // Insert some items and confirm that they're set.
     for ($i = 0; $i <= 3; $i++) {
diff --git a/core/modules/user/lib/Drupal/user/Tests/TempStoreDatabaseTest.php b/core/modules/user/lib/Drupal/user/Tests/TempStoreDatabaseTest.php
index 0437837..a2af2ba 100644
--- a/core/modules/user/lib/Drupal/user/Tests/TempStoreDatabaseTest.php
+++ b/core/modules/user/lib/Drupal/user/Tests/TempStoreDatabaseTest.php
@@ -11,6 +11,7 @@
 use Drupal\user\TempStoreFactory;
 use Drupal\Core\Lock\DatabaseLockBackend;
 use Drupal\Core\Database\Database;
+use Drupal\Core\Serialization\PhpSerialize;
 
 /**
  * Tests the TempStore namespace.
@@ -83,7 +84,7 @@ protected function tearDown() {
    */
   public function testUserTempStore() {
     // Create a key/value collection.
-    $factory = new TempStoreFactory(Database::getConnection(), new DatabaseLockBackend(Database::getConnection()));
+    $factory = new TempStoreFactory(new PhpSerialize(), Database::getConnection(), new DatabaseLockBackend(Database::getConnection()));
     $collection = $this->randomName();
 
     // Create two mock users.