It depends on what you’re building, I’d say:
- If you’re building something for production use — absolutely do not use that branch right now. We don’t support Symfony v6 for real world use with that SDK yet. You can watch the thread I linked for updates as we roll out a stable version.
- If you’re building something to learn or are prototyping a concept — there’s no harm there, as long as real users won’t be using it. I’d pin to a commit rather than the branch, however, as breaking changes will inevitably happen with that development branch.
My tip would allow you to use that branch in your project, presumably, but does not negate the warnings I shared.