Symfony 5.4.1 has just been released. Here is a list of the most
important changes:

• bug #44490 [DependencyInjection][Messenger] Add auto-registration for BatchHandlerInterface (@GaryPEGEOT)
• bug #44523 [Console] Fix polyfill-php73 requirement (@Seldaek)
• bug #44502 [HttpFoundation] do not call preg_match() on null (@xabbuh)
• bug #44475 [Console] Handle alias in completion script (@GromNaN)
• bug #44481 [FrameworkBundle] Fix loginUser() causing deprecation (@wouterj)
• bug #44416 [Translation] Make http requests synchronous when reading the Loco API (@Kocal)
• bug #44437 [HttpKernel] Fix wrong usage of SessionUtils::popSessionCookie (@simonchrz)
• bug #44350 [Translation] Fix TranslationTrait (@Tomasz Kusy)
• bug #44460 [SecurityBundle] Fix ambiguous deprecation message on missing provider (@chalasr)
• bug #44467 [Console] Fix parameter types for ProcessHelper::mustRun() (@derrabus)
• bug #44427 [FrameworkBundle] Fix compatibility with symfony/security-core 6.x (deps=high tests) (@wouterj)
• bug #44424 [SecurityBundle] Don't rely on deprecated strategy constants (@derrabus)
• bug #44399 Prevent infinite nesting of lazy ObjectManager instances when ObjectManager is reset (@Ocramius)
• bug #44395 [HttpKernel] fix sending Vary: Accept-Language when appropriate (@nicolas-grekas)
• bug #44385 [DependencyInjection] Skip parameter attribute configurators in AttributeAutoconfigurationPass if we can't get the constructor reflector (@fancyweb)
• bug #44359 Avoid duplicated session listener registration in tests (@alexander-schranz)
• bug #44375 [DoctrineBridge] fix calling get_class on non-object (@kbond)
• bug #44378 [HttpFoundation] fix SessionHandlerFactory using connections (@dmaicher)
• bug #44365 [SecurityBundle] Fix invalid reference with always_authenticate_before_granting (@chalasr)
• bug #44361 [HttpClient] Fix handling error info in MockResponse (@fancyweb)
• bug #44370 [Lock] create lock table if it does not exist (@martinssipenko)

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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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