diff --git a/core/core.services.yml b/core/core.services.yml
index b0cde45..1d90ae6 100644
--- a/core/core.services.yml
+++ b/core/core.services.yml
@@ -129,7 +129,7 @@ services:
       - { name: needs_destruction }
 
   serialization.phpserialize:
-    class: Drupal\Core\Serialization\PhpSerialize
+    class: Drupal\Component\Serialization\PhpSerialize
 
   settings:
     class: Drupal\Component\Utility\Settings
diff --git a/core/lib/Drupal/Core/Serialization/Exception/InvalidDataTypeException.php b/core/lib/Drupal/Component/Serialization/Exception/InvalidDataTypeException.php
similarity index 53%
rename from core/lib/Drupal/Core/Serialization/Exception/InvalidDataTypeException.php
rename to core/lib/Drupal/Component/Serialization/Exception/InvalidDataTypeException.php
index e6b8ce6..e4f9211 100644
--- a/core/lib/Drupal/Core/Serialization/Exception/InvalidDataTypeException.php
+++ b/core/lib/Drupal/Component/Serialization/Exception/InvalidDataTypeException.php
@@ -2,10 +2,10 @@
 
 /**
  * @file
- * Contains \Drupal\Core\Serialization\Exception\InvalidDataTypeException.
+ * Contains \Drupal\Component\Serialization\Exception\InvalidDataTypeException.
  */
 
-namespace Drupal\Core\Serialization\Exception;
+namespace Drupal\Component\Serialization\Exception;
 
 /**
  * Exception thrown when a data type is invalid.
diff --git a/core/lib/Drupal/Core/Serialization/PhpSerialize.php b/core/lib/Drupal/Component/Serialization/PhpSerialize.php
similarity index 82%
rename from core/lib/Drupal/Core/Serialization/PhpSerialize.php
rename to core/lib/Drupal/Component/Serialization/PhpSerialize.php
index 4b912ba..a6f11fc 100644
--- a/core/lib/Drupal/Core/Serialization/PhpSerialize.php
+++ b/core/lib/Drupal/Component/Serialization/PhpSerialize.php
@@ -2,10 +2,10 @@
 
 /**
  * @file
- * Contains \Drupal\Core\Serialization\PhpSerialize.
+ * Contains \Drupal\Component\Serialization\PhpSerialize.
  */
 
-namespace Drupal\Core\Serialization;
+namespace Drupal\Component\Serialization;
 
 /**
  * Default serialization for serialized PHP.
diff --git a/core/lib/Drupal/Core/Serialization/SerializationInterface.php b/core/lib/Drupal/Component/Serialization/SerializationInterface.php
similarity index 87%
rename from core/lib/Drupal/Core/Serialization/SerializationInterface.php
rename to core/lib/Drupal/Component/Serialization/SerializationInterface.php
index 7713032..c5e68f1 100644
--- a/core/lib/Drupal/Core/Serialization/SerializationInterface.php
+++ b/core/lib/Drupal/Component/Serialization/SerializationInterface.php
@@ -2,10 +2,10 @@
 
 /**
  * @file
- * Contains \Drupal\Core\Serialization\SerializationInterface.
+ * Contains \Drupal\Component\Serialization\SerializationInterface.
  */
 
-namespace Drupal\Core\Serialization;
+namespace Drupal\Component\Serialization;
 
 /**
  * Defines an interface for serialization formats.
diff --git a/core/lib/Drupal/Core/KeyValueStore/DatabaseStorage.php b/core/lib/Drupal/Core/KeyValueStore/DatabaseStorage.php
index d25d2f3..d989364 100644
--- a/core/lib/Drupal/Core/KeyValueStore/DatabaseStorage.php
+++ b/core/lib/Drupal/Core/KeyValueStore/DatabaseStorage.php
@@ -7,9 +7,9 @@
 
 namespace Drupal\Core\KeyValueStore;
 
+use Drupal\Component\Serialization\SerializationInterface;
 use Drupal\Core\Database\Query\Merge;
 use Drupal\Core\Database\Connection;
-use Drupal\Core\Serialization\SerializationInterface;
 
 /**
  * Defines a default key/value store implementation.
@@ -22,7 +22,7 @@ class DatabaseStorage extends StorageBase {
   /**
    * The serialization class to use.
    *
-   * @var \Drupal\Core\Serialization\SerializationInterface
+   * @var \Drupal\Component\Serialization\SerializationInterface
    */
   protected $serializer;
 
@@ -45,7 +45,7 @@ class DatabaseStorage extends StorageBase {
    *
    * @param string $collection
    *   The name of the collection holding key and value pairs.
-   * @param \Drupal\Core\Serialization\SerializationInterface $serializer
+   * @param \Drupal\Component\Serialization\SerializationInterface $serializer
    *   The serialization class to use.
    * @param \Drupal\Core\Database\Connection $connection
    *   The database connection to use.
diff --git a/core/lib/Drupal/Core/KeyValueStore/DatabaseStorageExpirable.php b/core/lib/Drupal/Core/KeyValueStore/DatabaseStorageExpirable.php
index f4923cf..3263a47 100644
--- a/core/lib/Drupal/Core/KeyValueStore/DatabaseStorageExpirable.php
+++ b/core/lib/Drupal/Core/KeyValueStore/DatabaseStorageExpirable.php
@@ -7,10 +7,10 @@
 
 namespace Drupal\Core\KeyValueStore;
 
+use Drupal\Component\Serialization\SerializationInterface;
 use Drupal\Core\DestructableInterface;
 use Drupal\Core\Database\Connection;
 use Drupal\Core\Database\Query\Merge;
-use Drupal\Core\Serialization\SerializationInterface;
 
 /**
  * Defines a default key/value store implementation for expiring items.
@@ -38,7 +38,7 @@ class DatabaseStorageExpirable extends DatabaseStorage implements KeyValueStoreE
    *
    * @param string $collection
    *   The name of the collection holding key and value pairs.
-   * @param \Drupal\Core\Serialization\SerializationInterface $serializer
+   * @param \Drupal\Component\Serialization\SerializationInterface $serializer
    *   The serialization class to use.
    * @param \Drupal\Core\Database\Connection $connection
    *   The database connection to use.
diff --git a/core/lib/Drupal/Core/KeyValueStore/KeyValueDatabaseExpirableFactory.php b/core/lib/Drupal/Core/KeyValueStore/KeyValueDatabaseExpirableFactory.php
index 895d7ed..5ff8ae6 100644
--- a/core/lib/Drupal/Core/KeyValueStore/KeyValueDatabaseExpirableFactory.php
+++ b/core/lib/Drupal/Core/KeyValueStore/KeyValueDatabaseExpirableFactory.php
@@ -7,9 +7,9 @@
 
 namespace Drupal\Core\KeyValueStore;
 
+use Drupal\Component\Serialization\SerializationInterface;
 use Drupal\Core\DestructableInterface;
 use Drupal\Core\Database\Connection;
-use Drupal\Core\Serialization\SerializationInterface;
 
 /**
  * Defines the key/value store factory for the database backend.
@@ -26,7 +26,7 @@ class KeyValueDatabaseExpirableFactory implements KeyValueExpirableFactoryInterf
   /**
    * The serialization class to use.
    *
-   * @var \Drupal\Core\Serialization\SerializationInterface
+   * @var \Drupal\Component\Serialization\SerializationInterface
    */
   protected $serializer;
 
@@ -40,7 +40,7 @@ class KeyValueDatabaseExpirableFactory implements KeyValueExpirableFactoryInterf
   /**
    * Constructs this factory object.
    *
-   * @param \Drupal\Core\Serialization\SerializationInterface $serializer
+   * @param \Drupal\Component\Serialization\SerializationInterface $serializer
    *   The serialization class to use.
    * @param \Drupal\Core\Database\Connection $connection
    *   The Connection object containing the key-value tables.
diff --git a/core/lib/Drupal/Core/KeyValueStore/KeyValueDatabaseFactory.php b/core/lib/Drupal/Core/KeyValueStore/KeyValueDatabaseFactory.php
index 43063ab..391b08e 100644
--- a/core/lib/Drupal/Core/KeyValueStore/KeyValueDatabaseFactory.php
+++ b/core/lib/Drupal/Core/KeyValueStore/KeyValueDatabaseFactory.php
@@ -7,9 +7,9 @@
 
 namespace Drupal\Core\KeyValueStore;
 
+use Drupal\Component\Serialization\SerializationInterface;
 use Drupal\Core\Database\Connection;
 use Drupal\Core\Database\Database;
-use Drupal\Core\Serialization\SerializationInterface;
 
 /**
  * Defines the key/value store factory for the database backend.
@@ -19,7 +19,7 @@ class KeyValueDatabaseFactory implements KeyValueFactoryInterface {
   /**
    * The serialization class to use.
    *
-   * @var \Drupal\Core\Serialization\SerializationInterface
+   * @var \Drupal\Component\Serialization\SerializationInterface
    */
   protected $serializer;
 
@@ -33,7 +33,7 @@ class KeyValueDatabaseFactory implements KeyValueFactoryInterface {
   /**
    * Constructs this factory object.
    *
-   * @param \Drupal\Core\Serialization\SerializationInterface $serializer
+   * @param \Drupal\Component\Serialization\SerializationInterface $serializer
    *   The serialization class to use.
    * @param \Drupal\Core\Database\Connection $connection
    *   The Connection object containing the key-value tables.
diff --git a/core/modules/system/lib/Drupal/system/Tests/KeyValueStore/DatabaseStorageExpirableTest.php b/core/modules/system/lib/Drupal/system/Tests/KeyValueStore/DatabaseStorageExpirableTest.php
index d53b914..ed4236b 100644
--- a/core/modules/system/lib/Drupal/system/Tests/KeyValueStore/DatabaseStorageExpirableTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/KeyValueStore/DatabaseStorageExpirableTest.php
@@ -38,7 +38,7 @@ protected function setUp() {
       ->addArgument(new Reference('serialization.phpserialize'))
       ->addArgument(new Reference('database'));
     $this->container
-      ->register('serialization.phpserialize', 'Drupal\Core\Serialization\PhpSerialize');
+      ->register('serialization.phpserialize', 'Drupal\Component\Serialization\PhpSerialize');
     $this->settingsSet('keyvalue_expirable_default', 'keyvalue.expirable.database');
   }
 
diff --git a/core/modules/system/lib/Drupal/system/Tests/KeyValueStore/DatabaseStorageTest.php b/core/modules/system/lib/Drupal/system/Tests/KeyValueStore/DatabaseStorageTest.php
index 3442530..2254501 100644
--- a/core/modules/system/lib/Drupal/system/Tests/KeyValueStore/DatabaseStorageTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/KeyValueStore/DatabaseStorageTest.php
@@ -37,7 +37,7 @@ protected function setUp() {
       ->addArgument(new Reference('serialization.phpserialize'))
       ->addArgument(new Reference('database'));
     $this->container
-      ->register('serialization.phpserialize', 'Drupal\Core\Serialization\PhpSerialize');
+      ->register('serialization.phpserialize', 'Drupal\Component\Serialization\PhpSerialize');
     $this->settingsSet('keyvalue_default', 'keyvalue.database');
   }
 
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 3e20c99..e583e75 100644
--- a/core/modules/system/lib/Drupal/system/Tests/KeyValueStore/GarbageCollectionTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/KeyValueStore/GarbageCollectionTest.php
@@ -7,9 +7,9 @@
 
 namespace Drupal\system\Tests\KeyValueStore;
 
+use Drupal\Component\Serialization\PhpSerialize;
 use Drupal\Core\Database\Database;
 use Drupal\Core\KeyValueStore\DatabaseStorageExpirable;
-use Drupal\Core\Serialization\PhpSerialize;
 use Drupal\simpletest\UnitTestBase;
 
 /**
diff --git a/core/modules/user/lib/Drupal/user/TempStoreFactory.php b/core/modules/user/lib/Drupal/user/TempStoreFactory.php
index 7574ba7..c93cb58 100644
--- a/core/modules/user/lib/Drupal/user/TempStoreFactory.php
+++ b/core/modules/user/lib/Drupal/user/TempStoreFactory.php
@@ -7,10 +7,10 @@
 
 namespace Drupal\user;
 
+use Drupal\Component\Serialization\SerializationInterface;
 use Drupal\Core\Database\Connection;
 use Drupal\Core\KeyValueStore\DatabaseStorageExpirable;
 use Drupal\Core\Lock\LockBackendInterface;
-use Drupal\Core\Serialization\SerializationInterface;
 
 /**
  * Creates a key/value storage object for the current user or anonymous session.
@@ -20,7 +20,7 @@ class TempStoreFactory {
   /**
    * The serialization class to use.
    *
-   * @var \Drupal\Core\Serialization\SerializationInterface
+   * @var \Drupal\Component\Serialization\SerializationInterface
    */
   protected $serializer;
 
@@ -41,7 +41,7 @@ class TempStoreFactory {
   /**
    * Constructs a Drupal\user\TempStoreFactory object.
    *
-   * @param \Drupal\Core\Serialization\SerializationInterface $serializer
+   * @param \Drupal\Component\Serialization\SerializationInterface $serializer
    *   The serialization class to use.
    * @param \Drupal\Core\Database\Connection $connection
    *   The connection object used for this data.
diff --git a/core/modules/user/lib/Drupal/user/Tests/TempStoreDatabaseTest.php b/core/modules/user/lib/Drupal/user/Tests/TempStoreDatabaseTest.php
index a2af2ba..1c83eb8 100644
--- a/core/modules/user/lib/Drupal/user/Tests/TempStoreDatabaseTest.php
+++ b/core/modules/user/lib/Drupal/user/Tests/TempStoreDatabaseTest.php
@@ -7,11 +7,11 @@
 
 namespace Drupal\user\Tests;
 
+use Drupal\Component\Serialization\PhpSerialize;
 use Drupal\simpletest\UnitTestBase;
 use Drupal\user\TempStoreFactory;
 use Drupal\Core\Lock\DatabaseLockBackend;
 use Drupal\Core\Database\Database;
-use Drupal\Core\Serialization\PhpSerialize;
 
 /**
  * Tests the TempStore namespace.