Currently using php 7.3 to production (and everywhere), which has EOL at 06.12.2021. Upgrading to 7.4 should be straightforward and it would give us one more year of security updates till Wordpress is 100% ready for php 8.

Tasks

• Change php version to our tests docker image and update master-theme and blocks-plugin relevant CI jobs.
• Change php version to our base docker image.
• Test to see any irregularities.
• Check plugins on different NROs if they work with the new version (dev sites, check sentry for errors).
• Push it to production.