In dokku's case, he is also pegged to a fixed set of components. Installing herokuish - which is installed via a package - will install an exact version of each

In dokku's case, he is also pegged to a fixed set of components. Installing herokuish - which is installed via a package - will install an exact version of each buildpack. If it is upgraded, then new versions are pulled in. The same exact issue would have been seen with Cloud Foundry.