---
title: "Handling deprecations"
manual: "TYPO3 Explained"
version: "12.4"
permalink: "https://docs.typo3.org/permalink/t3coreapi:cgl-deprecation@12.4"
source: "CodingGuidelines/CodingBestPractices/HandlingDeprecations.rst"
rendered: "2026-10-21T15:29:37+00:00"
---

> [!WARNING]
> **Attention**
>
> TYPO3 v12 has reached end-of-life as of April 30th 2026 and
> is no longer being maintained. Use the version switcher on the top
> left of this page to select documentation for a supported version of TYPO3.
>
> Need more time before upgrading?
> You can purchase Extended Long Term Support (ELTS) for TYPO3 v12 here:
> [TYPO3 ELTS](https://typo3.com/services/extended-support-elts).

# Handling deprecations {#cgl-deprecation}

> [!NOTE]
> How to handle deprecations in TYPO3 CMS is covered in the
> Contribution Guide: [How to deprecate classes, methods, arguments and hooks in the TYPO3 Core](https://docs.typo3.org/m/typo3/guide-contributionworkflow/main/en-us/Appendix/HowToDeprecateThings.html#deprecations).