[Python] How to install / update package with pipenv without updating the rest of packages?

With pipenv, how do I add or update only one package without changing versions of other packages? I've tried both:

pipenv update --selective-upgrade requests


and

pipenv update --keep-outdated requests


but still versions of all the packages are updated during locking.

Pipfile & Pifile.lock: https://gist.github.com/jozo/d8351ed708e84c5ea0f69e82e585e5c6

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