Minor versions are not binary compatible but in general it is trivial to cross-compile for different Scala versions if you are writing a library and SBT makes i

Minor versions are not binary compatible but in general it is trivial to cross-compile for different Scala versions if you are writing a library and SBT makes it pretty simple to use the right binary for your projects Scala version. As the author mentions this sort of breaks down when library authors drop support for older Scala versions. In my experience though that is primarily an issue with Spark being way behind in Scala version support.