Patch/Bugfix update 

The top bar of a TYPO3 backend showing the current version being used.

You can find the current TYPO3 Core version in the top left of the TYPO3 backend.

What are patch/bugfix updates 

Patch/Bugfix updates contain bugfixes and security updates. They never contain new features and do not break backwards compatibility.

For example, updating from TYPO3 version 11.5.2 to 11.5.3 is a patch/bugfix update.

Before updating 

The pre-upgrade tasks chapter contains a list of tasks that should be completed prior to upgrading to a major release.

The only tasks that need to be completed for a patch/bugfix update are making a backup and updating the reference index.

Check if updates are available 

There are two ways to check if a patch/bugfix update is available for an installation of TYPO3.

All supported versions of TYPO3 and their version numbers are published on get.typo3.org.

Alternatively, running composer outdated -m "typo3/*" will present a list of any TYPO3 packages that have patch/bugfix updates.

Execute the update 

To execute the update, run composer update --with-all-dependencies "typo3/*".

This will update all TYPO3 packages. The --with-all-dependencies signals that any dependencies of TYPO3 should also be updated.

Post update 

Once Composer has completed updating the TYPO3 installation log in to the backend and clear all caches.

You should also do a database compare.

Admin Tools > Maintenance > Flush TYPO3 and PHP Cache