Docker Hub as a build service doesnt make it very easy to update older images; you can set manual triggers to rebuild current if the FROM container changes, but

Docker Hub as a build service doesnt make it very easy to update older images; you can set manual triggers to rebuild current if the FROM container changes, but thats not automatic. Other dependencies are not very easy either as you only get one FROM, then everything else is probably from git repos, packages, language packaging tools or tarfiles, which obviously need checking for updates.