Hi all, we are about to migrate to prefect 3, is there any breaking changes if we only update the server but keep the code and its

@flows

and all their attributes 🙂 ? Thanks !

Hi Alexis! The main thing that I can think of is that agents,

prefect deployment build

, and

Deployment.build_from_flow()

are deprecated in Prefect 3.0. There are much better alternatives available for all of these. Here are some docs that talk about these changes in more detail: • Upgrade from agents to workers • Upgrade to Prefect 3

thanks a lot @Bianca Hoch

So, Can I upgrade our self-hosted prefect server to 3, but leave the process worker as 2.20 ? and maybe alternatively set up a second worker that’s using prefect 3, then migrate deployments to the version 3 worker? ( so we can test them individually and not have to big-bang upgrade and risk downtime ).

Hi Corris, my recommendation would be running two servers (2.0 and 3.0), two workers (2.0 and 3.0), and then re-deploying your 2.0 flows to your 3.0 worker and server one at a time.

Hi @Bianca Hoch, Thanks, that’ll work. now to decide if I use prefect.domain.tld or prefect3.domain.tld …. I’m currently using prefect2.domain.tld lol. https://xkcd.com/910/