> For example, if master is v1.5.0, and I'm an app that uses v1.1.0, then if the library owner bumps to 1.5.1 for a critical update, I need to go from 1.1.0 ->

> For example, if master is v1.5.0, and I'm an app that uses v1.1.0, then if the library owner bumps to 1.5.1 for a critical update, I need to go from 1.1.0 -> 1.5.1, which might involve changes I'm not ready for yet. I better have phenomenal integration testing to make sure the update is safe to do. That could be solved by backporting security fixes to version 1.1. Of course at a certain point you should deprecate older versions of your package. At which point it's the client's responsibility to upgrade (like for any third party library they would be using).