diff --git a/UPGRADE-6.4.md b/UPGRADE-6.4.md
index de9921cfa28d6..69530cdc44022 100644
--- a/UPGRADE-6.4.md
+++ b/UPGRADE-6.4.md
@@ -80,6 +80,11 @@ Serializer
  * Deprecate Doctrine annotations support in favor of native attributes
  * Deprecate passing an annotation reader to the constructor of `AnnotationLoader`
 
+Templating
+----------
+
+ * The component is deprecated and will be removed in 7.0. Use Twig instead.
+
 Validator
 ---------
 
diff --git a/src/Symfony/Component/Templating/CHANGELOG.md b/src/Symfony/Component/Templating/CHANGELOG.md
index c627e669f25d6..3cd7923846f3d 100644
--- a/src/Symfony/Component/Templating/CHANGELOG.md
+++ b/src/Symfony/Component/Templating/CHANGELOG.md
@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+6.4
+---
+
+* Deprecate the component, use Twig instead
+
 2.5.0
 -----
 
diff --git a/src/Symfony/Component/Templating/DelegatingEngine.php b/src/Symfony/Component/Templating/DelegatingEngine.php
index bbe500549aa28..8c3b783a97c15 100644
--- a/src/Symfony/Component/Templating/DelegatingEngine.php
+++ b/src/Symfony/Component/Templating/DelegatingEngine.php
@@ -11,10 +11,14 @@
 
 namespace Symfony\Component\Templating;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', DelegatingEngine::class);
+
 /**
  * DelegatingEngine selects an engine for a given template.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 class DelegatingEngine implements EngineInterface, StreamingEngineInterface
 {
diff --git a/src/Symfony/Component/Templating/EngineInterface.php b/src/Symfony/Component/Templating/EngineInterface.php
index bfa0b8bb5e1d9..a743100504d29 100644
--- a/src/Symfony/Component/Templating/EngineInterface.php
+++ b/src/Symfony/Component/Templating/EngineInterface.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\Templating;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', EngineInterface::class);
+
 /**
  * EngineInterface is the interface each engine must implement.
  *
@@ -27,6 +29,8 @@
  * the template.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 interface EngineInterface
 {
diff --git a/src/Symfony/Component/Templating/Helper/Helper.php b/src/Symfony/Component/Templating/Helper/Helper.php
index 537e8e584ce02..66f7a01a9bad4 100644
--- a/src/Symfony/Component/Templating/Helper/Helper.php
+++ b/src/Symfony/Component/Templating/Helper/Helper.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\Templating\Helper;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', Helper::class);
+
 /**
  * Helper is the base class for all helper classes.
  *
@@ -18,6 +20,8 @@
  * class that exposes a read-only interface for templates.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 abstract class Helper implements HelperInterface
 {
diff --git a/src/Symfony/Component/Templating/Helper/HelperInterface.php b/src/Symfony/Component/Templating/Helper/HelperInterface.php
index 8377f1446734a..f0ed54bc57d46 100644
--- a/src/Symfony/Component/Templating/Helper/HelperInterface.php
+++ b/src/Symfony/Component/Templating/Helper/HelperInterface.php
@@ -11,10 +11,14 @@
 
 namespace Symfony\Component\Templating\Helper;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', HelperInterface::class);
+
 /**
  * HelperInterface is the interface all helpers must implement.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 interface HelperInterface
 {
diff --git a/src/Symfony/Component/Templating/Helper/SlotsHelper.php b/src/Symfony/Component/Templating/Helper/SlotsHelper.php
index 358e5fc071222..3781ac1158c85 100644
--- a/src/Symfony/Component/Templating/Helper/SlotsHelper.php
+++ b/src/Symfony/Component/Templating/Helper/SlotsHelper.php
@@ -11,10 +11,14 @@
 
 namespace Symfony\Component\Templating\Helper;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', SlotsHelper::class);
+
 /**
  * SlotsHelper manages template slots.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 class SlotsHelper extends Helper
 {
diff --git a/src/Symfony/Component/Templating/Loader/CacheLoader.php b/src/Symfony/Component/Templating/Loader/CacheLoader.php
index c3b4613ed3d06..795024a79f723 100644
--- a/src/Symfony/Component/Templating/Loader/CacheLoader.php
+++ b/src/Symfony/Component/Templating/Loader/CacheLoader.php
@@ -15,6 +15,8 @@
 use Symfony\Component\Templating\Storage\Storage;
 use Symfony\Component\Templating\TemplateReferenceInterface;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', CacheLoader::class);
+
 /**
  * CacheLoader is a loader that caches other loaders responses
  * on the filesystem.
@@ -23,6 +25,8 @@
  * All other mechanism would imply the use of `eval()`.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 class CacheLoader extends Loader
 {
diff --git a/src/Symfony/Component/Templating/Loader/ChainLoader.php b/src/Symfony/Component/Templating/Loader/ChainLoader.php
index 936a75630b845..3520198cab513 100644
--- a/src/Symfony/Component/Templating/Loader/ChainLoader.php
+++ b/src/Symfony/Component/Templating/Loader/ChainLoader.php
@@ -14,10 +14,14 @@
 use Symfony\Component\Templating\Storage\Storage;
 use Symfony\Component\Templating\TemplateReferenceInterface;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', ChainLoader::class);
+
 /**
  * ChainLoader is a loader that calls other loaders to load templates.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 class ChainLoader extends Loader
 {
diff --git a/src/Symfony/Component/Templating/Loader/FilesystemLoader.php b/src/Symfony/Component/Templating/Loader/FilesystemLoader.php
index 6c06ed85c2a9e..6499e3040e3d0 100644
--- a/src/Symfony/Component/Templating/Loader/FilesystemLoader.php
+++ b/src/Symfony/Component/Templating/Loader/FilesystemLoader.php
@@ -15,10 +15,14 @@
 use Symfony\Component\Templating\Storage\Storage;
 use Symfony\Component\Templating\TemplateReferenceInterface;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', FilesystemLoader::class);
+
 /**
  * FilesystemLoader is a loader that read templates from the filesystem.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 class FilesystemLoader extends Loader
 {
diff --git a/src/Symfony/Component/Templating/Loader/Loader.php b/src/Symfony/Component/Templating/Loader/Loader.php
index 6df5cf2124d5b..42058cc87c9ed 100644
--- a/src/Symfony/Component/Templating/Loader/Loader.php
+++ b/src/Symfony/Component/Templating/Loader/Loader.php
@@ -13,10 +13,14 @@
 
 use Psr\Log\LoggerInterface;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', Loader::class);
+
 /**
  * Loader is the base class for all template loader classes.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 abstract class Loader implements LoaderInterface
 {
diff --git a/src/Symfony/Component/Templating/Loader/LoaderInterface.php b/src/Symfony/Component/Templating/Loader/LoaderInterface.php
index 531a1dff13818..2f7f670bf4ab2 100644
--- a/src/Symfony/Component/Templating/Loader/LoaderInterface.php
+++ b/src/Symfony/Component/Templating/Loader/LoaderInterface.php
@@ -14,10 +14,14 @@
 use Symfony\Component\Templating\Storage\Storage;
 use Symfony\Component\Templating\TemplateReferenceInterface;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', LoaderInterface::class);
+
 /**
  * LoaderInterface is the interface all loaders must implement.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 interface LoaderInterface
 {
diff --git a/src/Symfony/Component/Templating/PhpEngine.php b/src/Symfony/Component/Templating/PhpEngine.php
index 0b158be9f2c34..3f437756b7bf2 100644
--- a/src/Symfony/Component/Templating/PhpEngine.php
+++ b/src/Symfony/Component/Templating/PhpEngine.php
@@ -17,12 +17,16 @@
 use Symfony\Component\Templating\Storage\Storage;
 use Symfony\Component\Templating\Storage\StringStorage;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', PhpEngine::class);
+
 /**
  * PhpEngine is an engine able to render PHP templates.
  *
  * @implements \ArrayAccess<string, HelperInterface>
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 class PhpEngine implements EngineInterface, \ArrayAccess
 {
diff --git a/src/Symfony/Component/Templating/Storage/FileStorage.php b/src/Symfony/Component/Templating/Storage/FileStorage.php
index 2ed61dbd17120..886a97e696b25 100644
--- a/src/Symfony/Component/Templating/Storage/FileStorage.php
+++ b/src/Symfony/Component/Templating/Storage/FileStorage.php
@@ -11,10 +11,14 @@
 
 namespace Symfony\Component\Templating\Storage;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', FileStorage::class);
+
 /**
  * FileStorage represents a template stored on the filesystem.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 class FileStorage extends Storage
 {
diff --git a/src/Symfony/Component/Templating/Storage/Storage.php b/src/Symfony/Component/Templating/Storage/Storage.php
index f17d24e877ad0..0a4505d35fff4 100644
--- a/src/Symfony/Component/Templating/Storage/Storage.php
+++ b/src/Symfony/Component/Templating/Storage/Storage.php
@@ -11,10 +11,14 @@
 
 namespace Symfony\Component\Templating\Storage;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', Storage::class);
+
 /**
  * Storage is the base class for all storage classes.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 abstract class Storage
 {
diff --git a/src/Symfony/Component/Templating/Storage/StringStorage.php b/src/Symfony/Component/Templating/Storage/StringStorage.php
index be3a2a4f7ebf5..91537b334c281 100644
--- a/src/Symfony/Component/Templating/Storage/StringStorage.php
+++ b/src/Symfony/Component/Templating/Storage/StringStorage.php
@@ -11,10 +11,14 @@
 
 namespace Symfony\Component\Templating\Storage;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', StringStorage::class);
+
 /**
  * StringStorage represents a template stored in a string.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 class StringStorage extends Storage
 {
diff --git a/src/Symfony/Component/Templating/StreamingEngineInterface.php b/src/Symfony/Component/Templating/StreamingEngineInterface.php
index 539bcbce14ff1..8319f90c39152 100644
--- a/src/Symfony/Component/Templating/StreamingEngineInterface.php
+++ b/src/Symfony/Component/Templating/StreamingEngineInterface.php
@@ -11,10 +11,14 @@
 
 namespace Symfony\Component\Templating;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', StreamingEngineInterface::class);
+
 /**
  * StreamingEngineInterface provides a method that knows how to stream a template.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 interface StreamingEngineInterface
 {
diff --git a/src/Symfony/Component/Templating/TemplateNameParser.php b/src/Symfony/Component/Templating/TemplateNameParser.php
index dd68e4099181e..30e91fee6967d 100644
--- a/src/Symfony/Component/Templating/TemplateNameParser.php
+++ b/src/Symfony/Component/Templating/TemplateNameParser.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\Templating;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', TemplateNameParser::class);
+
 /**
  * TemplateNameParser is the default implementation of TemplateNameParserInterface.
  *
@@ -18,6 +20,8 @@
  * and the extension for the engine.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 class TemplateNameParser implements TemplateNameParserInterface
 {
diff --git a/src/Symfony/Component/Templating/TemplateNameParserInterface.php b/src/Symfony/Component/Templating/TemplateNameParserInterface.php
index f688c60dd70bd..b902716b1f247 100644
--- a/src/Symfony/Component/Templating/TemplateNameParserInterface.php
+++ b/src/Symfony/Component/Templating/TemplateNameParserInterface.php
@@ -11,11 +11,15 @@
 
 namespace Symfony\Component\Templating;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', TemplateNameParserInterface::class);
+
 /**
  * TemplateNameParserInterface converts template names to TemplateReferenceInterface
  * instances.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 interface TemplateNameParserInterface
 {
diff --git a/src/Symfony/Component/Templating/TemplateReference.php b/src/Symfony/Component/Templating/TemplateReference.php
index e42f49a55460a..ff4ea7f2c8904 100644
--- a/src/Symfony/Component/Templating/TemplateReference.php
+++ b/src/Symfony/Component/Templating/TemplateReference.php
@@ -11,10 +11,14 @@
 
 namespace Symfony\Component\Templating;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', TemplateReference::class);
+
 /**
  * Internal representation of a template.
  *
  * @author Victor Berchet <victor@suumit.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 class TemplateReference implements TemplateReferenceInterface
 {
diff --git a/src/Symfony/Component/Templating/TemplateReferenceInterface.php b/src/Symfony/Component/Templating/TemplateReferenceInterface.php
index f9fe8e16c47dd..c4ffa3ad78d3c 100644
--- a/src/Symfony/Component/Templating/TemplateReferenceInterface.php
+++ b/src/Symfony/Component/Templating/TemplateReferenceInterface.php
@@ -11,10 +11,14 @@
 
 namespace Symfony\Component\Templating;
 
+trigger_deprecation('symfony/templating', '6.4', '"%s" is deprecated since version 6.4 and will be removed in 7.0. Use Twig instead.', TemplateReferenceInterface::class);
+
 /**
  * Interface to be implemented by all templates.
  *
  * @author Victor Berchet <victor@suumit.com>
+ *
+ * @deprecated since Symfony 6.4, use Twig instead
  */
 interface TemplateReferenceInterface
 {
diff --git a/src/Symfony/Component/Templating/Tests/DelegatingEngineTest.php b/src/Symfony/Component/Templating/Tests/DelegatingEngineTest.php
index 112aff3537afa..f5e07445df962 100644
--- a/src/Symfony/Component/Templating/Tests/DelegatingEngineTest.php
+++ b/src/Symfony/Component/Templating/Tests/DelegatingEngineTest.php
@@ -16,6 +16,9 @@
 use Symfony\Component\Templating\EngineInterface;
 use Symfony\Component\Templating\StreamingEngineInterface;
 
+/**
+ * @group legacy
+ */
 class DelegatingEngineTest extends TestCase
 {
     public function testRenderDelegatesToSupportedEngine()
diff --git a/src/Symfony/Component/Templating/Tests/Helper/HelperTest.php b/src/Symfony/Component/Templating/Tests/Helper/HelperTest.php
index e60ffc5e82619..a779cfc694fd9 100644
--- a/src/Symfony/Component/Templating/Tests/Helper/HelperTest.php
+++ b/src/Symfony/Component/Templating/Tests/Helper/HelperTest.php
@@ -14,6 +14,9 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Templating\Helper\Helper;
 
+/**
+ * @group legacy
+ */
 class HelperTest extends TestCase
 {
     public function testGetSetCharset()
diff --git a/src/Symfony/Component/Templating/Tests/Helper/SlotsHelperTest.php b/src/Symfony/Component/Templating/Tests/Helper/SlotsHelperTest.php
index ad4e8ecfe23ff..92a584e1919e8 100644
--- a/src/Symfony/Component/Templating/Tests/Helper/SlotsHelperTest.php
+++ b/src/Symfony/Component/Templating/Tests/Helper/SlotsHelperTest.php
@@ -14,6 +14,9 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Templating\Helper\SlotsHelper;
 
+/**
+ * @group legacy
+ */
 class SlotsHelperTest extends TestCase
 {
     public function testHasGetSet()
diff --git a/src/Symfony/Component/Templating/Tests/Loader/CacheLoaderTest.php b/src/Symfony/Component/Templating/Tests/Loader/CacheLoaderTest.php
index da2dfc35417f6..0c1397eeefdc3 100644
--- a/src/Symfony/Component/Templating/Tests/Loader/CacheLoaderTest.php
+++ b/src/Symfony/Component/Templating/Tests/Loader/CacheLoaderTest.php
@@ -20,6 +20,9 @@
 use Symfony\Component\Templating\TemplateReference;
 use Symfony\Component\Templating\TemplateReferenceInterface;
 
+/**
+ * @group legacy
+ */
 class CacheLoaderTest extends TestCase
 {
     public function testConstructor()
diff --git a/src/Symfony/Component/Templating/Tests/Loader/ChainLoaderTest.php b/src/Symfony/Component/Templating/Tests/Loader/ChainLoaderTest.php
index f9b4df2fa3bd1..008fddf2c13fd 100644
--- a/src/Symfony/Component/Templating/Tests/Loader/ChainLoaderTest.php
+++ b/src/Symfony/Component/Templating/Tests/Loader/ChainLoaderTest.php
@@ -16,6 +16,9 @@
 use Symfony\Component\Templating\Loader\FilesystemLoader;
 use Symfony\Component\Templating\TemplateReference;
 
+/**
+ * @group legacy
+ */
 class ChainLoaderTest extends TestCase
 {
     protected FilesystemLoader $loader1;
diff --git a/src/Symfony/Component/Templating/Tests/Loader/FilesystemLoaderTest.php b/src/Symfony/Component/Templating/Tests/Loader/FilesystemLoaderTest.php
index 83cc32cb3bac9..4905cc7d17ece 100644
--- a/src/Symfony/Component/Templating/Tests/Loader/FilesystemLoaderTest.php
+++ b/src/Symfony/Component/Templating/Tests/Loader/FilesystemLoaderTest.php
@@ -17,6 +17,9 @@
 use Symfony\Component\Templating\Storage\FileStorage;
 use Symfony\Component\Templating\TemplateReference;
 
+/**
+ * @group legacy
+ */
 class FilesystemLoaderTest extends TestCase
 {
     protected static string $fixturesPath;
diff --git a/src/Symfony/Component/Templating/Tests/Loader/LoaderTest.php b/src/Symfony/Component/Templating/Tests/Loader/LoaderTest.php
index dc609b1742fa8..5e3ffd2d12570 100644
--- a/src/Symfony/Component/Templating/Tests/Loader/LoaderTest.php
+++ b/src/Symfony/Component/Templating/Tests/Loader/LoaderTest.php
@@ -17,6 +17,9 @@
 use Symfony\Component\Templating\Storage\Storage;
 use Symfony\Component\Templating\TemplateReferenceInterface;
 
+/**
+ * @group legacy
+ */
 class LoaderTest extends TestCase
 {
     public function testGetSetLogger()
diff --git a/src/Symfony/Component/Templating/Tests/PhpEngineTest.php b/src/Symfony/Component/Templating/Tests/PhpEngineTest.php
index a5cbdaa968135..3819326385eed 100644
--- a/src/Symfony/Component/Templating/Tests/PhpEngineTest.php
+++ b/src/Symfony/Component/Templating/Tests/PhpEngineTest.php
@@ -22,6 +22,9 @@
 use Symfony\Component\Templating\TemplateReference;
 use Symfony\Component\Templating\TemplateReferenceInterface;
 
+/**
+ * @group legacy
+ */
 class PhpEngineTest extends TestCase
 {
     protected ProjectTemplateLoader $loader;
diff --git a/src/Symfony/Component/Templating/Tests/Storage/FileStorageTest.php b/src/Symfony/Component/Templating/Tests/Storage/FileStorageTest.php
index 043967e3a4392..8ea3c5e175ac0 100644
--- a/src/Symfony/Component/Templating/Tests/Storage/FileStorageTest.php
+++ b/src/Symfony/Component/Templating/Tests/Storage/FileStorageTest.php
@@ -15,6 +15,9 @@
 use Symfony\Component\Templating\Storage\FileStorage;
 use Symfony\Component\Templating\Storage\Storage;
 
+/**
+ * @group legacy
+ */
 class FileStorageTest extends TestCase
 {
     public function testGetContent()
diff --git a/src/Symfony/Component/Templating/Tests/Storage/StorageTest.php b/src/Symfony/Component/Templating/Tests/Storage/StorageTest.php
index 8734886ac9936..39976321a7b14 100644
--- a/src/Symfony/Component/Templating/Tests/Storage/StorageTest.php
+++ b/src/Symfony/Component/Templating/Tests/Storage/StorageTest.php
@@ -14,6 +14,9 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Templating\Storage\Storage;
 
+/**
+ * @group legacy
+ */
 class StorageTest extends TestCase
 {
     public function testMagicToString()
diff --git a/src/Symfony/Component/Templating/Tests/Storage/StringStorageTest.php b/src/Symfony/Component/Templating/Tests/Storage/StringStorageTest.php
index d86d65a2aa525..ca0e71261af8a 100644
--- a/src/Symfony/Component/Templating/Tests/Storage/StringStorageTest.php
+++ b/src/Symfony/Component/Templating/Tests/Storage/StringStorageTest.php
@@ -15,6 +15,9 @@
 use Symfony\Component\Templating\Storage\Storage;
 use Symfony\Component\Templating\Storage\StringStorage;
 
+/**
+ * @group legacy
+ */
 class StringStorageTest extends TestCase
 {
     public function testGetContent()
diff --git a/src/Symfony/Component/Templating/Tests/TemplateNameParserTest.php b/src/Symfony/Component/Templating/Tests/TemplateNameParserTest.php
index 81bbb838b1fbc..9a8730db66180 100644
--- a/src/Symfony/Component/Templating/Tests/TemplateNameParserTest.php
+++ b/src/Symfony/Component/Templating/Tests/TemplateNameParserTest.php
@@ -15,6 +15,9 @@
 use Symfony\Component\Templating\TemplateNameParser;
 use Symfony\Component\Templating\TemplateReference;
 
+/**
+ * @group legacy
+ */
 class TemplateNameParserTest extends TestCase
 {
     protected TemplateNameParser $parser;
diff --git a/src/Symfony/Component/Templating/composer.json b/src/Symfony/Component/Templating/composer.json
index cd402b2451e5a..02d2b2158a9a7 100644
--- a/src/Symfony/Component/Templating/composer.json
+++ b/src/Symfony/Component/Templating/composer.json
@@ -17,6 +17,7 @@
     ],
     "require": {
         "php": ">=8.1",
+        "symfony/deprecation-contracts": "^2.5|^3",
         "symfony/polyfill-ctype": "~1.8"
     },
     "require-dev": {