diff --git a/tools/sandbox/Documents/Account.php b/tools/sandbox/Documents/Account.php
index cf05e2e1e3..1177e5b333 100644
--- a/tools/sandbox/Documents/Account.php
+++ b/tools/sandbox/Documents/Account.php
@@ -5,23 +5,16 @@
 namespace Documents;
 
 use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;
+use Doctrine\ODM\MongoDB\Types\Type;
 
-/** @ODM\Document(collection="accounts") */
+#[ODM\Document(collection: 'accounts')]
 class Account
 {
-    /**
-     * @ODM\Id
-     *
-     * @var string|null
-     */
-    protected $id;
-
-    /**
-     * @ODM\Field(type="string")
-     *
-     * @var string
-     */
-    protected $name;
+    #[ODM\Id]
+    protected ?string $id;
+
+    #[ODM\Field(type: Type::STRING)]
+    protected string $name;
 
     public function __construct(string $name)
     {
diff --git a/tools/sandbox/Documents/Address.php b/tools/sandbox/Documents/Address.php
index 9de89b2f4f..244d815e48 100644
--- a/tools/sandbox/Documents/Address.php
+++ b/tools/sandbox/Documents/Address.php
@@ -5,37 +5,22 @@
 namespace Documents;
 
 use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;
+use Doctrine\ODM\MongoDB\Types\Type;
 
-/** @ODM\EmbeddedDocument */
+#[ODM\EmbeddedDocument]
 class Address
 {
-    /**
-     * @ODM\Field(type="string")
-     *
-     * @var string|null
-     */
-    protected $street;
+    #[ODM\Field(type: Type::STRING)]
+    protected ?string $street;
 
-    /**
-     * @ODM\Field(type="string")
-     *
-     * @var string|null
-     */
-    protected $city;
+    #[ODM\Field(type: Type::STRING)]
+    protected ?string $city;
 
-    /**
-     * @ODM\Field(type="string")
-     *
-     * @var string|null
-     */
-    protected $state;
+    #[ODM\Field(type: Type::STRING)]
+    protected ?string $state;
 
-    /**
-     * @ODM\Field(type="string")
-     *
-     * @var string|null
-     */
-    protected $postalCode;
+    #[ODM\Field(type: Type::STRING)]
+    protected ?string $postalCode;
 
     public function getStreet(): ?string
     {
diff --git a/tools/sandbox/Documents/Phonenumber.php b/tools/sandbox/Documents/Phonenumber.php
index 0f0618fd8a..34e0fb4936 100644
--- a/tools/sandbox/Documents/Phonenumber.php
+++ b/tools/sandbox/Documents/Phonenumber.php
@@ -5,16 +5,13 @@
 namespace Documents;
 
 use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;
+use Doctrine\ODM\MongoDB\Types\Type;
 
-/** @ODM\EmbeddedDocument */
+#[ODM\EmbeddedDocument]
 class Phonenumber
 {
-    /**
-     * @ODM\Field(type="string")
-     *
-     * @var string|null
-     */
-    protected $phonenumber;
+    #[ODM\Field(type: Type::STRING)]
+    protected ?string $phonenumber;
 
     public function __construct(?string $phonenumber = null)
     {
diff --git a/tools/sandbox/Documents/User.php b/tools/sandbox/Documents/User.php
index 70efdfeb26..aad659fb26 100644
--- a/tools/sandbox/Documents/User.php
+++ b/tools/sandbox/Documents/User.php
@@ -7,52 +7,30 @@
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
 use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;
+use Doctrine\ODM\MongoDB\Types\Type;
 
 use function md5;
 
-/** @ODM\Document(collection="users") */
+#[ODM\Document(collection: 'users')]
 class User
 {
-    /**
-     * @ODM\Id
-     *
-     * @var string|null
-     */
-    protected $id;
-
-    /**
-     * @ODM\Field(type="string")
-     *
-     * @var string|null
-     */
-    private $username;
-
-    /**
-     * @ODM\Field(type="string")
-     *
-     * @var string|null
-     */
-    protected $password;
-
-    /**
-     * @ODM\EmbedOne(targetDocument=Address::class)
-     *
-     * @var Address|null
-     */
-    protected $address;
-
-    /**
-     * @ODM\ReferenceOne(targetDocument=Account::class)
-     *
-     * @var Account|null
-     */
-    protected $account;
-
-    /**
-     * @ODM\EmbedMany(targetDocument=Phonenumber::class)
-     *
-     * @var Collection<int, Phonenumber>
-     */
+    #[ODM\Id]
+    protected ?string $id;
+
+    #[ODM\Field(type: Type::STRING)]
+    private ?string $username;
+
+    #[ODM\Field(type: Type::STRING)]
+    protected ?string $password;
+
+    #[ODM\EmbedOne(targetDocument: Address::class)]
+    protected ?Address $address;
+
+    #[ODM\ReferenceOne(targetDocument: Account::class)]
+    protected ?Account $account;
+
+    /** @var Collection<int, Phonenumber> */
+    #[ODM\EmbedMany(targetDocument: Phonenumber::class)]
     protected $phonenumbers;
 
     public function __construct()
diff --git a/tools/sandbox/config.php b/tools/sandbox/config.php
index a90b173909..4a2576924a 100644
--- a/tools/sandbox/config.php
+++ b/tools/sandbox/config.php
@@ -4,8 +4,8 @@
 
 use Doctrine\ODM\MongoDB\Configuration;
 use Doctrine\ODM\MongoDB\DocumentManager;
-use Doctrine\ODM\MongoDB\Mapping\Driver\AnnotationDriver;
-use Symfony\Component\Cache\Adapter\ApcuAdapter;
+use Doctrine\ODM\MongoDB\Mapping\Driver\AttributeDriver;
+use Symfony\Component\Cache\Adapter\ArrayAdapter;
 
 $file = __DIR__ . '/../../vendor/autoload.php';
 
@@ -21,7 +21,7 @@
 $config->setHydratorDir(__DIR__ . '/Hydrators');
 $config->setHydratorNamespace('Hydrators');
 $config->setDefaultDB('doctrine_odm_sandbox');
-$config->setMetadataCache(new ApcuAdapter());
-$config->setMetadataDriverImpl(AnnotationDriver::create(__DIR__ . '/Documents'));
+$config->setMetadataCache(new ArrayAdapter());
+$config->setMetadataDriverImpl(AttributeDriver::create(__DIR__ . '/Documents'));
 
 $dm = DocumentManager::create(null, $config);