Hi, I stumbled across this repository, and saw that it is active. There's been quite some developments concerning PODIO at CERN, which is now hosted here: https://github.com/AIDASoft/podio. It may be a bit of effort, but please consider branching from the the latest version there. Also, in case it is relevant, there is a new common datamodel developed at https://github.com/key4hep/EDM4hep. Issues, questions and PRs for the upstream are of course welcome!