PHP 7.4 reached end-of-life on November 22nd 2022, and it is becoming increasingly difficult for us to maintain compatibility as most libraries and tools stopped supporting it.
Consequently, the upcoming MantisBT release 2.29.0 will drop support for PHP 7.4 and 8.0, increasing the minimum supported version to 8.1.
This follows our customary practice to align our PHP requirements with the version bundled in the oldest available Ubuntu LTS release that is still under standard maintenance, currently 22.04 Jammy Jellyfish.
While official PHP 8.1 support ended on December 31st 2025, the Ubuntu team is committed to maintain it for the lifetime of the 22.04 LTS release. Nevertheless, we recommend running a fully supported PHP version, i.e. 8.4 or later as of this writing.