Upstream sources — n8n

service	image	source repo	releases / changelog
app	n8nio/n8n	https://github.com/n8n-io/n8n	https://github.com/n8n-io/n8n/releases
db	pgautoupgrade/pgautoupgrade	https://github.com/pgautoupgrade/pgautoupgrade	https://hub.docker.com/r/pgautoupgrade/pgautoupgrade/tags

Standing notes

pgautoupgrade uses a non-standard tag scheme (e.g. 17-alpine, 18-alpine) mapping to the TARGET Postgres major version. 18-alpine = upgrade-on-start to Postgres 18. The compose.postgres.yml controls this image; the main compose.yml uses only n8nio/n8n (sqlite mode).
n8n 2.x: no breaking DB migrations between 2.23.2 and 2.25.3; standard rolling upgrade is safe.
The n8n Docker image on Docker Hub uses plain semver tags (e.g. 2.25.3); no -stable suffix needed.
n8n release notes: https://docs.n8n.io/release-notes/