Symfony 5.4.9 has just been released.
Here is the list of the most important changes since 5.4.8:

• bug #46386 [Console] Fix missing negative variation of negatable options in shell completion (@GromNaN)
• bug #46448 [DependencyInjection] Fix "proxy" tag: resolve its parameters and pass it to child definitions (@nicolas-grekas)
• bug #46442 [FrameworkBundle] Revert "bug #46125 Always add CacheCollectorPass (fancyweb)" (@chalasr)
• bug #46443 [DoctrineBridge] Don't reinit managers when they are proxied as ghost objects (@nicolas-grekas)
• bug #46427 [FrameworkBundle] fix wiring of annotations.cached_reader (@nicolas-grekas)
• bug #46425 [DependencyInjection] Ignore unused bindings defined by attribute (@nicolas-grekas)
• bug #46434 [FrameworkBundle] Fix BC break in abstract config commands (@yceruto)
• bug #46424 [Form] do not accept array input when a form is not multiple (@xabbuh)
• bug #46367 [Mime] Throw exception when body in Email attach method is not ok (@alamirault)
• bug #46421 [VarDumper][VarExporter] Deal with DatePeriod->include_end_date on PHP 8.2 (@nicolas-grekas)
• bug #46401 [Cache] Throw when "redis_sentinel" is used with a non-Predis "class" option (@buffcode)
• bug #46414 Bootstrap 4 fieldset for row errors (@konradkozaczenko)
• bug #46412 [FrameworkBundle] Fix dumping extension config without bundle (@yceruto)
• bug #46382 [HttpClient] Honor "max_duration" when replacing requests with async decorators (@nicolas-grekas)
• bug #46407 [Filesystem] Safeguard (sym)link calls (@derrabus)
• bug #46098 [Form] Fix same choice loader with different choice values (@HeahDude)
• bug #46380 [HttpClient] Add missing HttpOptions::setMaxDuration() (@nicolas-grekas)
• bug #46249 [HttpFoundation] [Session] Regenerate invalid session id (@peter17)
• bug #46328 [Config] Allow scalar configuration in PHP Configuration (@jderusse, @HypeMC)
• bug #46366 [Mime] Add null check for EmailHeaderSame (@magikid)
• bug #46364 [Config] Fix looking for single files in phars with GlobResource (@nicolas-grekas)
• bug #46365 [HttpKernel] Revert "bug #46327 Allow ErrorHandler ^5.0 to be used" (@nicolas-grekas)
• bug #46114 Fixes "Incorrectly nested style tag found" error when using multi-line header content (@Perturbatio)
• bug #46325 [Ldap] Fix LDAP connection options (@buffcode)
• bug #46341 Fix aliases handling in command name completion (@Seldaek)
• bug #46317 [Security/Http] Ignore invalid URLs found in failure/success paths (@nicolas-grekas)
• bug #46309 [Security] Fix division by zero (@tvlooy)
• bug #46327 [HttpKernel] Allow ErrorHandler ^5.0 to be used in HttpKernel 4.4 (@mpdude)
• bug #46297 [Serializer] Fix JsonSerializableNormalizer ignores circular reference handler in $context (@BreyndotEchse)
• bug #46291 [Console] Suppress unhandled error in some specific use-cases. (@rw4lll)
• bug #46302 [ErrorHandler] Fix list of tentative return types (@nicolas-grekas)
• bug #45981 [Serializer][PropertyInfo] Fix support for "false" built-in type on PHP 8.2 (@alexandre-daubois)
• bug #46277 [HttpKernel] Fix SessionListener without session in request (@edditor)
• bug #46282 [DoctrineBridge] Treat firstResult === 0 like null (@derrabus)
• bug #46239 [Translation] Refresh local translations on PushCommand if the provider has domains (@Florian-B)
• bug #46278 [Workflow] Fix deprecated syntax for interpolated strings (@nicolas-grekas)
• bug #46264 [Console] Better required argument check in InputArgument (@jnoordsij)
• bug #46262 [EventDispatcher] Fix removing listeners when using first-class callable syntax (@javer)
• bug #46216 [Form] fix populating single widget time view data with different timezones (@xabbuh)
• bug #46221 [DomCrawler][VarDumper] Fix html-encoding emojis (@nicolas-grekas)
• bug #46167 [VarExporter] Fix exporting DateTime objects on PHP 8.2 (@nicolas-grekas)

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to detect the code you will need to change in your project and
read our upgrade
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