Great question! The Prefect images used by the Helm chart are published to both Docker Hub and GitHub Container Registry (GHCR). You can browse all available tags here: - Docker Hub: prefecthq/prefect tags - GHCR: ghcr.io/prefecthq/prefect tags Tip: In the Helm chart,

global.prefect.image.prefectTag

is just the Docker tag (e.g.,

3.1.2

). Be sure to check which registry/repository you’re using via the other image fields (e.g.,

registry

and

repository

). Ways to verify a tag exists (without guessing): - Check via a quick manifest lookup (no layer download):

# GHCR
docker manifest inspect <http://ghcr.io/prefecthq/prefect:<TAG|ghcr.io/prefecthq/prefect:<TAG>>

# Docker Hub
docker manifest inspect <http://docker.io/prefecthq/prefect:<TAG|docker.io/prefecthq/prefect:<TAG>>

- Try a pull (will error fast if the tag doesn’t exist):

docker pull <http://ghcr.io/prefecthq/prefect:<TAG|ghcr.io/prefecthq/prefect:<TAG>>

- List tags programmatically (useful for scripting):

# Using crane (go-containerregistry)
crane ls <http://ghcr.io/prefecthq/prefect|ghcr.io/prefecthq/prefect> | sort -V | tail
crane ls prefecthq/prefect | sort -V | tail  # Docker Hub

# Using skopeo
skopeo list-tags <docker://ghcr.io/prefecthq/prefect>
skopeo list-tags <docker://docker.io/prefecthq/prefect>

# Docker Hub v2 API (no auth)
curl -s '<https://registry.hub.docker.com/v2/repositories/prefecthq/prefect/tags/?page_size=100>' | jq -r '.results[].name'

Notes: - In Prefect 3.x you’ll typically see plain semantic version tags like

3.x.y

. Sometimes variant tags exist (e.g., with a Python version or conda). If you don’t need a specific variant, the plain version tag is a safe choice. - It’s best to align your

prefectTag

with the Prefect version you intend to run (

prefect version

should match the server tag you deploy). Reference for the Helm values (for context): - Prefect Helm chart repo: prefect-helm - Values file (shows

global.prefect.image.*

): values.yaml If you share the exact tag you’re considering and which registry you pull from, I can sanity-check it for you.