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Requested runtime (ÿþpython-3.6.5) is not available for this stack on Heroku

I updated the python version from 3.6.4 to 3.6.5 today. This is because, in the process of distributing to Heroku, it recommends version 3.6.5. Therefore, the following power shell contents were confirmed.

Writing objects: 100% (35/35), 11.68 KiB | 0 bytes/s, done.
Total 35 (delta 3), reused 0 (delta 0)
remote: Compressing source files... done.
remote: -----> Python app detected
remote:  !     The latest version of Python 3 is python-3.6.5 (you are using ÿþpython-3.6.5, which is unsupported).
remote:  !     We recommend upgrading by specifying the latest version (python-3.6.5).
remote:        Learn More: https://devcenter.heroku.com/articles/python-runtimes
remote: -----> Installing ÿþpython-3.6.5
remote:  !     Requested runtime (ÿþpython-3.6.5) is not available for this stack (heroku-16).
remote:  !     Aborting.  More info: https://devcenter.heroku.com/articles/python-support
remote:  !     Push rejected, failed to compile Python app.
remote:
remote:  !     Push failed
remote:
remote: !       Push rejected to XXXXXXXX.
remote:
To https://git.heroku.com/XXXXXXXX.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/XXXXXXXX.git

After changing my runtime.txt file to UTF-8, I now get the following error:

Writing objects: 100% (35/35), 11.68 KiB | 0 bytes/s, done.
Total 35 (delta 3), reused 0 (delta 0)
remote: Compressing source files... done.
remote: -----> Python app detected
remote:  !     The latest version of Python 3 is python-3.6.5 (you are using python-3.6.5, which is unsupported).
remote:  !     We recommend upgrading by specifying the latest version (python-3.6.5).
remote:        Learn More: https://devcenter.heroku.com/articles/python-runtimes
remote: -----> Installing python-3.6.5
remote:  !     Requested runtime (python-3.6.5) is not available for this stack (heroku-16).
remote:  !     Aborting.  More info: https://devcenter.heroku.com/articles/python-support
remote:  !     Push rejected, failed to compile Python app.
remote:
remote:  !     Push failed
remote: Verifying deploy...
remote:
remote: !       Push rejected to XXXXXXXX.
remote:
To https://git.heroku.com/XXXXXXXX.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/XXXXXXXX.git

Why is python-3.6.5 being rejected? Isn't that exactly what Heroku says is the default version?

Solution

  • Heroku believes that your runtime.txt contains some extra characters:

    ÿþpython-3.6.5

    This is probably byte-order mark for a file encoded as UTF-16 in little-endian order. Make sure you're using a sane encoding for that file (and others). UTF-8 is a good choice in virtually all situations.