TYPO3 14.0.1, 13.4.21 and 12.4.40 fix Symfony incompatibility

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12/02/2025 | Estimated reading time : min.

This article was automatically translated using DeepL. Therefore, inaccuracies may occur.

TYPO3 has released three maintenance updates. All of them fix a Symfony incompatibility that can affect Composer installations.

The TYPO3 core developers have released three new maintenance releases. All three versions fix an important problem with a Symfony dependency.

Which versions are affected?

The update affects all three active TYPO3 branches:

TYPO3 14.0.1
TYPO3 13.4.21 LTS
TYPO3 12.4.40 LTS

The problem: Incompatibility with Symfony 7.4.0

All three releases are pure maintenance updates. The main reason for the release is an incompatibility with the Symfony component dependency-injection in version 7.4.0.

The issue may affect all Composer-based installations. If you manage TYPO3 via Composer, you should install the update as soon as possible.

Installation and update

No database migrations are necessary for the update. You can update as usual via Composer or download the packages directly from get.typo3.org.

You can find the complete release notes for each version in the official news.

Conclusion

If you run TYPO3 with Composer, the update is important. The incompatibility with Symfony 7.4.0 can lead to problems. The update is uncomplicated and possible without database changes.

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[Translate to English:] Wolfgang Wagner, TYPO3 Experte und Trainer

Hi, I'm Wolfgang.

I have been working with TYPO3 since 2006. Not in theory, but in real projects with real deadlines. I've probably had the problems you're having three times already.

At some point, I started putting my knowledge into video courses. Not because I like being in front of the camera, but because I kept hearing the same questions over and over again. There are now hundreds of videos. Every single one was the result of a specific question from a specific project.

What makes me different from a YouTube tutorial: I not only know the solution, but also the context. Why something works. When it doesn't work. And which mistakes you can avoid because I've already made them.

As a member of the TYPO3 Education Committee, I make sure that the certification exams are kept up to date. What is tested there flows directly into my courses.