Symfony 6.3.1 has just been released.
Here is the list of the most important changes since 6.3.0:

bug #50763 [DependencyInjection] Skip errored definitions deep-referenced as runtime exceptions (@nicolas-grekas)
bug #50637 [FrameworkBundle] Fixed parsing new JSON output of debug:config not possible (@Toflar)
bug #50728 [HttpClient] Explicitly exclude CURLOPT_POSTREDIR (@nicolas-grekas)
bug #50710 [FrameworkBundle] Fix setting decorated services during tests (@nicolas-grekas)
bug #50749 [AssetMapper] Allow DirectoryResource for cache (@weaverryan)
bug #50760 [HttpFoundation] Require PHPUnit 9.6 by default (@nicolas-grekas)
bug #50747 [HttpKernel] Nullable and default value arguments in RequestPayloadValueResolver (@mdeboer)
bug #48961 [WebProfilerBundle] right blocks: fix display (@jmsche)
bug #50730 [HttpFoundation] Make Request::getPayload() return an empty InputBag if request body is empty (@nicolas-grekas)
bug #50654 [Validator] Add the message option to the PasswordStrength constraint (@alexandre-daubois)
bug #50671 [HttpClient] Fix encoding some characters in query strings (Daniel Kozák)
bug #50673 [HttpKernel] make RequestPayloadValueResolver::resolve() throw on variadic argument (@javaDeveloperKid)
bug #50655 Revert „Respect isRetryable decision of the retry strategy for re-delivery“ (@bendavies)
bug #50665 [FrameworkBundle] Ignore missing directories in about command (@ro0NL)
bug #50644 [VarDumper] Dumping DateTime throws error if getTimezone is false (@bogdanmoza)
bug #50712 [FrameworkBundle] Fix secrets:list not displaying local vars (@nicolas-grekas)
bug #50656 Only update autoload_runtime.php when it changed (@Seldaek)
bug #50698 [HttpClient] Fix int conversion for GenericRetryStrategy with floated multiplier (@francisbesset)
bug #50686 [Messenger] Don’t mark RedispatchMessage as internal (@valtzu)
bug #50530 [DependencyInjection] Fix support for false boolean env vars (@Okhoshi)
bug #50577 [HttpClient] Remove final keyword on AsyncResponse (@lyrixx)
bug #50611 [Clock] Fix MockClock::modify() on PHP 8.3 (@nicolas-grekas)
bug #50548 [FrameworkBundle] Show non-bundle extensions in debug:config & config:dump list view & completion (@HypeMC)
bug #50585 [Cache] Fix RedisTrait::createConnection for cluster (@darkanakin41)
bug #50599 [MonologBridge] widen return type for Monolog 3 compatibility (@xabbuh)
bug #50546 [FrameworkBundle] Fix debug:config & config:dump in debug mode (@HypeMC)
bug #50560 [DependencyInjection] Support PHP 8.2 true and null type (@ruudk)
bug #50563 [FrameworkBundle] remove unusable cache pools (@xabbuh)
bug #50567 [PhpUnitBridge] Ignore deprecations about the annotation mapping driver when it’s not possible to move to the attribute driver yet (@nicolas-grekas)
bug #50562 [Lock] Fix sprintf (@fancyweb)
bug #50540 [Validator] GH-50526: Reverting ExecutionContextInterface void return types in favor of docblock annotations. (@upchuk)
bug #50524 Fix Doctrine deprecations (@nicolas-grekas)
bug #50539 [Validator] Remove internal from methods on non-internal interfaces (@wouterj)
bug #50532 [Messenger] Prevent StopWorkerOnSignalsListener::$signals to be assigned to null in case SIGTERM constant doesn’t exist (@alexandre-daubois)
bug #50534 [PhpUnitBridge] Fix support for the NO_COLOR env var (@nicolas-grekas)
bug #50525 [PhpUnitBridge] Fix classifying doctrine/deprecations as direct/indirect (@nicolas-grekas)
bug #50521 [Serializer] Fix ignoring objects that only implement DenormalizableInterface (@spideyfusion)
bug #50517 [DependencyInjection] Fix casting scalar env vars from null (@fancyweb)
bug #50515 [Mailer] [MailPace] Fix undefined array key in errors response (Florian Heller)
bug #50514 [PhpUnitBridge] Disable deduplication of Doctrine deprecations (@nicolas-grekas)
bug #50508 [Messenger] Add deprecation message for the messenger.listener.stop_worker_on_sigterm_signal_listener service (@alexandre-daubois)
bug #50507 [Cache] Fix DBAL deprecations (@MatTheCat)
bug #50501 [Serializer] Fix discriminator map not working with AbstractNormalizer::OBJECT_TO_POPULATE (@HypeMC)
bug #50503 [SecurityBundle] Fix error message when using OIDC and web-token/jwt-core is not installed (@nicolas-grekas)
bug #50498 [FrameworkBundle] ease migration to symfony 6.3 (@lyrixx)
bug #50480 [Serializer] Fix discriminator map not working with AbstractNormalizer::OBJECT_TO_POPULATE (@HypeMC)
bug #50493 [VarDumper] Use documentElement instead of body for JS flag (@ohader)

Want to upgrade to this new release? Because Symfony protects
backwards-compatibility very closely, this should be quite easy. Use
SymfonyInsight upgrade reports
to detect the code you will need to change in your project and
read our upgrade
documentation to learn more.

Want to be notified whenever a new Symfony release is published? Or when a
version is not maintained anymore? Or only when a security issue is fixed?
Consider subscribing to the Symfony Roadmap Notifications.

Symfony Blog

Read More