Dokku/herokuish do indeed lock down to specific buildpacks [1]. You just happened to use a method that allowed you to use any version of that buildpack (multi-b

Dokku/herokuish do indeed lock down to specific buildpacks [1]. You just happened to use a method that allowed you to use any version of that buildpack (multi-buildpack, which is provided by Heroku itself). [1] https://github.com/gliderlabs/herokuish/tree/master/buildpacks https://github.com/gliderlabs/herokuish/tree/master/buildpac...