Symfony 5.4.29 has just been released.
Here is the list of the most important changes since 5.4.28:

• bug #51701 [Serializer] Fix parsing XML root node attributes (@mtarld)
• bug #51588 [FrameworkBundle] Always use buildDir as ConfigBuilderGenerator outputDir (@HypeMC)
• bug #51675 [Messenger] Fix cloned TraceableStack not unstacking the stack independently (@krciga22)
• bug #51198 [DependencyInjection] Fix autocasting null env values to empty string with container.env_var_processors_locator (@fancyweb)
• bug #51683 [Cache] Fix support for Redis Sentinel using php-redis 6.0.0 (@Qonstrukt)
• bug #51686 [SecurityBundle][PasswordHasher] Fix password migration with custom hasher service with security bundle config (@ogizanagi)
• bug #51671 [FrameworkBundle] Fix support for translator.default_path in XML (@HeahDude)
• bug #51659 [HttpClient] Fix TraceableResponse if response has no destruct method (@maxhelias)
• bug #51598 [Cache] fix using multiple Redis Sentinel hosts when the first one is not resolvable (@digilist)
• bug #51497 [FrameworkBundle] no serializer mapping cache in debug mode without enable_annotations (@soyuka)
• bug #51645 [String] Update wcswidth data with Unicode 15.1 (@fancyweb)
• bug #51586 [ErrorHandler] Handle PHP 8.3 highlight_file function output changes (@PhilETaylor)
• bug #47221 [Serializer] Fallback looking for DiscriminatorMap on interfaces (@Caligone)
• bug #51511 [PasswordHasher] Avoid passing null to hash_pbkdf2() (@sdespont)

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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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