Symfony 5.3.4 has just been released. Here is a list of the most
important changes:

bug #41504 [Translation] Fix default value for locales in translation push|pull commands (@welcoMattic)
bug #42243 [Translation] [Lokalise] Fix bas _uri (@welcoMattic, @Nyholm)
bug #42212 [Lock] Handle lock with long key (@jderusse)
bug #42223 [Debug][ErrorHandler] Do not use the php80 polyfill (@nicolas-grekas)
bug #42207 [Console] fix table setHeaderTitle without headers (@a1812)
bug #42130 [Translation] fix fallback to Locale::getDefault() (@nicolas-grekas)
bug #42184 [Mailer] Make sure Http TransportException is not leaking (@Nyholm)
bug #42091 [Console] Run commands when implements SignalableCommandInterface without pcntl and they have’nt signals (@PaolaRuby)
bug #42150 [Form] Fix ‘invali _message’ use in multiple ChoiceType (@alexandre-daubois)
bug #42183 [Notifier] Allow passing a previous throwable to exceptions (@derrabus)
bug #42185 [Notifier] Make sure Http TransportException is not leaking (@Nyholm)
bug #42182 [Notifier] Make sure Http TransportException is not leaking (@Nyholm)
bug #42173 [Messenger] [Redis] Fix auth option wrongly considered invalid (@chalasr)
bug #42174 Indicate compatibility with psr/log 2 and 3 (@derrabus)
bug #41897 [Security] fix #41891 Save hashed tokenValue in RememberMe cookie (@qurben)
bug #42156 Fix missing assignment (@Seldaek)
bug #42112 [HttpFoundation] fix FileBag under PHP 8.1 (@alexpott)
bug #42131 [PhpUnitBridge] Fix composer resolution on Windows (@Rainrider)
bug #42097 [DependencyInjection] Support for intersection types (@derrabus)
bug #42114 [HttpFoundation] Fix return types of SessionHandler::gc() (@derrabus)
bug #42099 [VarDumper] Support for intersection types (@derrabus)
bug #42011 [Cache] Support decorated Dbal drivers in PdoAdapter (@Jeroeny)
bug #42068 Add a Special Case for Translating Choices in e _U _POSIX (@chrisguitarguy)
bug #42074 Fix ctyp _digit deprecation (@alexpott)
bug #42084 [WebProfilerBundle] Fix the values of some CSS properties (@javiereguiluz)
bug #42079 [FrameworkBundle] Fixed file operations in Sodium vault seal (@javiereguiluz)
bug #42078 [DoctrineBridge] [Doctrine Bridge] Fix an exception message (@javiereguiluz)
bug #42067 [Messenger] [Redis] Make auth option works (@welcoMattic)
bug #42054 [DoctrineBridge] fix setting default mapping type to attribute/annotation on php 8/7 respectively (@nicolas-grekas)
bug #42059 [Messenger] Fixed BC layer for RedeliveryStamp (@Nyholm)
bug #42060 [Messenger] AmqpTransport implements QueueReceiverInterface (@xabbuh)
bug #42049 [TwigBridge] do not render the same label id attribute twice (@xabbuh)
bug #42019 [DependencyInjection] Fix TaggedLocator attribute without indexAttribute argument (@Lucas Bäuerle)
bug #42032 [HttpKernel] recover from failed deserializations (@xabbuh)
bug #42035 [Messenger] Fix us _notify default value for PostgreSqlConnection (@tgalopin)
bug #42009 [Console] Fix save correct name in setDefaultCommand() for PHP8 (@a1812)
bug #41990 [Lock] fix derivating semaphore from key (@nicolas-grekas)
bug #41986 [Notifier] Fix TransportTestCase (@OskarStark)
bug #40529 [Translation] Missing translations from traits (@insekticid)
bug #41384 Fix SkippedTestSuite (@jderusse)
bug #41966 [Console] Revert “bug #41952 fix handling positional arguments” (@chalasr, @nicolas-grekas)
bug #41905 [EventDispatcher] Correct the called event listener method case (@JJsty1e)
bug #41961 [Serializer] Need to clear cache when updating Annotation Groups on Entities (@monteiro)
bug #41952 [Console] fix handling positional arguments (@nicolas-grekas)
bug #41917 Rethrow exception in DoctrineTokenProvider (@jderusse)
bug #41887 [PhpUnitBridge] Fix deprecation handler with PHPUnit 10 (@YaFou)

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backwards-compatibility very closely, this should be quite easy. Use
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to detect the code you will need to change in your project and
read our upgrade
documentation to learn more.

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