As rightly pointed out by @Timothy Jones this is a theoretical breaking change without bumping the major version number. Unfortunately, past Beth made the decision to tie the docker tag to the underlying broker gem version, which means that the situation where we’ve made a potentially breaking change to the packaging, rather than the API, is hard to express in our current tag format. Current Beth apologises for Past Beth’s versioning strategy decision! Hopefully, in practical terms, this is not an ACTUAL breaking change for anyone, as Docker 19 has been out of support for quite some time.