diff --git a/CHANGELOG-6.4.md b/CHANGELOG-6.4.md
index 5fac4dddffe18..6171610473139 100644
--- a/CHANGELOG-6.4.md
+++ b/CHANGELOG-6.4.md
@@ -7,6 +7,41 @@ in 6.4 minor versions.
 To get the diff for a specific change, go to https://github.com/symfony/symfony/commit/XXX where XXX is the change hash
 To get the diff between two versions, go to https://github.com/symfony/symfony/compare/v6.4.0...v6.4.1
 
+* 6.4.9 (2024-06-28)
+
+ * bug #57553 [HttpKernel] Enable optional cache-warmers when cache-dir != build-dir (nicolas-grekas)
+ * bug #57497 [String] Fixed u()->snake(), b()->snake() and s()->snake() methods (arczinosek)
+ * bug #57574 [Filesystem] Fix Filesystem::remove() on Windows (nicolas-grekas)
+ * bug #57572 [DoctrineBridge] Fix compat with DI >= 6.4 (nicolas-grekas)
+ * bug #57538 [String] Add `alias` case to `EnglishInflector` (alexandre-daubois)
+ * bug #57533 [FrameworkBundle] Throw runtime exception when trying to use asset-mapper while http-client is disabled (nicolas-grekas)
+ * bug #57520 [SecurityBundle] Remove unused memory users’ `name` attribute from the XSD (MatTheCat)
+ * feature #57557 Ibexa is sponsoring Symfony 5.4, thanks to them! \o/ (nicolas-grekas)
+ * bug #57569 [HttpClient][Mailer] Revert "Let curl handle transfer encoding", use HTTP/1.1 for Mailgun (nicolas-grekas)
+ * bug #57499 [Mailer] Add additional headers in Scaleway bridge (MrMicky-FR)
+ * bug #57460 [VarExporter] fix contravariance problem with __unserialize() in lazy proxy (nikophil)
+ * bug #57397 [VarDumper] Fix FFI caster test (alexandre-daubois)
+ * bug #57453 [HttpClient] Fix parsing SSE (fancyweb)
+ * bug #57467 [SecurityBundle] Add `provider` XML attribute to the authenticators it’s missing from (MatTheCat)
+ * bug #57384 [Notifier] Fix thread key in GoogleChat bridge (romain-jacquart)
+ * bug #57372 [HttpKernel][Security] Fix accessing session for stateless request (VincentLanglet)
+ * bug #57112 [Messenger] Handle `AMQPConnectionException` when publishing a message (jwage)
+ * bug #57341 [Serializer] properly handle invalid data for false/true types (xabbuh)
+ * bug #57187 [Serializer] Fix `ObjectNormalizer` with property path (HypeMC)
+ * bug #57355 [ErrorHandler] Fix rendered exception code highlighting on PHP 8.3 (tscni)
+ * bug #57310 [DependencyInjection] Fix ternary in `AutowireCallable` attribute (alamirault)
+ * bug #57273 [FrameworkBundle] Fix setting default context for certain normalizers (HypeMC)
+ * bug #57395 [Notifier]  send the recipient phone number as an array (xabbuh)
+ * bug #52699 [Serializer] [PropertyAccessor] Ignore non-collection interface generics (mtarld)
+ * bug #54634 [String] Fix #54611 pluralization of -on ending words + singularization of -a ending foreign words (Geordie, DesLynx)
+ * bug #57213 [Validator] [UniqueValidator] Use correct variable as parameter in (custom) error message (seho-nl, Sebastien Hoek)
+ * bug #54920 [Messenger] Comply with Amazon SQS requirements for message body (VincentLanglet)
+ * bug #57321 [AssetMapper] fix npm version constraint conversion (Jean-Beru)
+ * bug #57110 [PhpUnitBridge] Fix error handler triggered outside of tests (HypeMC)
+ * bug #57297 [FrameworkBundle] not registered definitions must not be modified (xabbuh)
+ * bug #57234 [String] Fix Inflector for 'hardware' (podhy)
+ * bug #57224 [Mime] Use streams instead of loading raw message generator into memory (bytestream)
+
 * 6.4.8 (2024-06-02)
 
  * bug #57284 [Mime] Fix TextPart using an unknown File (fabpot)
diff --git a/src/Symfony/Component/HttpKernel/Kernel.php b/src/Symfony/Component/HttpKernel/Kernel.php
index 344db521d9519..d20596d9c3298 100644
--- a/src/Symfony/Component/HttpKernel/Kernel.php
+++ b/src/Symfony/Component/HttpKernel/Kernel.php
@@ -76,12 +76,12 @@ abstract class Kernel implements KernelInterface, RebootableInterface, Terminabl
      */
     private static array $freshCache = [];
 
-    public const VERSION = '6.4.9-DEV';
+    public const VERSION = '6.4.9';
     public const VERSION_ID = 60409;
     public const MAJOR_VERSION = 6;
     public const MINOR_VERSION = 4;
     public const RELEASE_VERSION = 9;
-    public const EXTRA_VERSION = 'DEV';
+    public const EXTRA_VERSION = '';
 
     public const END_OF_MAINTENANCE = '11/2026';
     public const END_OF_LIFE = '11/2027';