Today, I upgrade my DockerDesktop app (which comes with `docker-compose`) on Mac M1 to version 4.29.0 (build 145265) and I have a warning saying:
```
WARN[0000] .../mwcore/docker-compose.yml: `version` is obsolete
```
v4.29.0 of Docker Desktop runs version 26.0.0 of the Docker Engine and `docker-compose` version 2.26.1 which means at this point in time, the `version` top-level element is no longer necessary and can be removed completely ([[ https://docs.docker.com/compose/compose-file/04-version-and-name/ | doc ]]).
As a MediaWiki developer on Mac (as I currently see for myself), if you run into this warning, you can ignore it for now, it's harmless but we'll need to remove it in the near future as Compose doesn't use version numbers to select an exact schema to validate compose files anyways.