GitHub README.md reports:
ISC BIND9 Container (Stable: 9.18.27_xx) built on top of Alpine
Last update: 7-29-24
Latest Stable Docker Tag: 9.18.27-r0
NOTE: "Last Update" is the date of the latest DockerHub build.
DockerHub at GitHub-linked URL (https://hub.docker.com/r/ventz/bind/) reports:
ISC BIND9 Container (Stable: 9.16.15_xx) built on top of Alpine
Last update: 5-20-21
Latest Stable Docker Tag: 9.16.15-r0
NOTE: "Last Update" is the date of the latest DockerHub build.
It seems like the most recent update on GitHub didn't make it through to DockerHub for some reason.