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Git-backed distributionsĪnything that works with a standard pip requirements file will work as expected on Heroku. This will ensure consistent build behavior when newer package versions are released.

All secondary dependencies should be explicitly specified.

All package versions should be explicitly specified.

If you follow these simple recommendations, your application builds will be deterministic: To specify Python package dependencies on Heroku via pip, add a pip requirements file named requirements.txt to the root of your repository.

Any requirements that install locally with the following command will behave as expected on Heroku: $ pip install -r requirements.txt Heroku’s pip support is very transparent. This guide outlines how to fully utilize Heroku’s support for specifying dependencies for your Python application via pip.