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

Who writes here?

Hi, I am Wolfgang.

Since 2006, I've been diving deep into the fascinating world of TYPO3 - it's not only my profession, but also my passion. My path has taken me through countless projects, and I have created hundreds of professional video tutorials focusing on TYPO3 and its extensions. I love unraveling complex topics and turning them into easy-to-understand concepts, which is also reflected in my trainings and seminars.

As an active member of the TYPO3 Education Committee, I am committed to keeping the TYPO3 CMS Certified Integrator exam questions current and challenging. Since January 2024, I am proud to be an official TYPO3 Consultant Partner!

But my passion doesn't end at the screen. When I'm not diving into the depths of TYPO3, you'll often find me on my bike, exploring the picturesque trails around Lake Constance. These outdoor excursions are my perfect balance - they keep my mind fresh and always provide me with new ideas.