Symfony 5.3.11 has just been released. Here is a list of the most
important changes:

bug #44188 [VarExporter] fix exporting declared but unset properties when __sleep() is implemented (@nicolas-grekas)
bug #44176 [Console] Default ansi option to null (@jderusse)
bug #44119 [HttpClient][Mime] Add correct IDN flags for IDNA2008 compliance (@j-bernard)
bug #44131 [Yaml] properly parse quoted strings tagged with !!str (@xabbuh)
bug #42323 [TwigBridge] do not merge label classes into expanded choice labels (@xabbuh)
bug #44110 [FrameworkBundle] Fix default PHP attributes support in validation and serializer configuration when doctrine/annotations is not installed with PHP 8 (@fancyweb)
bug #44121 [Serializer] fix support for lazy properties (@nicolas-grekas)
bug #44108 [FrameworkBundle][Messenger] remove FlattenExceptionNormalizer definition if serializer not available (@kbond)
bug #44111 [Serializer] fix support for unset properties on PHP < 7.4 (@nicolas-grekas)
bug #44070 [Process] intersect with getenv() to populate default envs (@nicolas-grekas)
bug #43990 [Translation] [Loco] Generate id parameter instead of letting Loco do it (@welcoMattic)
bug #44043 [Cache] fix dbindex Redis (@a1812)
bug #44050 [Notifier] Fix package names (@fabpot)
bug #44042 Fix DateIntervalToStringTransformer::transform() doc (@BenMorel)
bug #44034 [Yaml] don’t try to replace references in quoted strings (@xabbuh)
bug #44028 [ErrorHandler] Fix FlattenException::setPrevious argument typing (@welcoMattic)
bug #44012 [DependencyInjection] fix inlining when non-shared services are involved (@nicolas-grekas)
bug #44002 [Cache] Fix Memory leak (@a1812)
bug #43981 [FrameworkBundle] fix registering late resettable services (@nicolas-grekas)
bug #43988 [DoctrineBridge] add support for the JSON type (@dunglas)
bug #43987 [PhpUnitBridge] Fix Uncaught ValueError (@dunglas)
bug #43961 [HttpClient] Curl http client has to reinit curl multi handle on reset (@rmikalkenas)
bug #43948 [Asset][Security] Fixed leftover deprecations PHP 8.1 (@michaljusiega)
bug #43945 [Runtime] fix defining APP_DEBUG when Dotenv is not enabled (@nicolas-grekas)
bug #43922 [DependencyInjection] only allow ReflectionNamedType for ServiceSubscriberTrait (@kbond)
bug #43814 [Intl] Update the ICU data to 70.1 – 5.3 (@jderusse)
bug #43915 [Messenger] Fix tests (@jderusse)
bug #43901 [SecurityBundle] Default access_decision_manager.strategy option with merge (@biozshock)
bug #43909 [VarExporter] escape unicode chars involved in directionality (@nicolas-grekas)
bug #43900 [Security] Fix TypeError message in ChainUserProvider (@derrabus)
bug #43884 [Console] Runtime conflict for psr/log >= 3.0 instead of composer conflict (@fancyweb)
bug #43867 [VarDumper] Make dumping DateInterval instances timezone-independent (@derrabus)
bug #43096 [Messenger] Use TransportMessageIdStamp in InMemoryTransport allows retrying (@alexndlm)
bug #42168 [RateLimiter] Fix wait duration for fixed window policy (@jlekowski)
bug #43501 [HttpKernel] fix ErrorException in CacheWarmerAggregate (@Ahummeling)
bug #42361 [Translation] correctly handle intl domains with TargetOperation (@acran)
bug #43833 [Runtime] Consider also $_ENV when resolving APP_RUNTIME and APP_RUNTIME_OPTIONS (@Peter Simoncic)
bug #43834 [Inflector] Fix inflector for „zombies“ (@acodispo)
bug #43267 [Config] Fix signature generation with nested attributes on PHP 8.1 (@agustingomes)

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read our upgrade
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