For Prefect 3.x server, I’d recommend Python 3.13.
Why:
- 3.13 and 3.14 are both supported by Prefect 3.x
- But 3.13 is the safer choice for running a server in production because it has had longer ecosystem maturity
- 3.14 support was added more recently, so unless you specifically need 3.14, 3.13 is the more conservative pick
So the short answer is:
Use Python 3.13.
If you want, I can also help you check this against:
- your Prefect version
- your deployment method (Docker, Helm, bare server, etc.)
- whether you’re running Prefect Server or workers/flows separately