Hi all,

I am trying to run an experiment that I developed some time ago in oTree 3. Locally everything works as intended when using oTree3 and an old Python interpreter (< 3.9) and I also had no problem deploying the experiment under the Heroku-20 stack in the past. The problem I am running into now is that this stack has reached end-of-life and has been replaced by the Heroku-22 and Heroku-24 stacks. To built my app under these stacks, I am instructed to use at least Python version 3.9. At the same time, oTree 3 does not seem to be supported by Python 3.9 or more recent versions. Has anyone run into this problem before? Is there any way around this other than upgrading my code to run under oTree 5? I am thankful for any assistance on this problem.