`poetry add` updates the version of the other dependencies

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

OS version and name: Kubuntu 20.04 Poetry version: 1.1.12

Issue

Hi there! First of all, thank you very much for this tool!

Recently, I have found out a weird behavior to me. However, maybe it poetry works as expected, so please then explain this behavior to me.

The issue is the following. When you add a new dependency to a project using the poetry add command, poetry also updates the versions of other libraries if the updates are available despite that the previous version is recorded in the poetry.lock file. Such behavior to me is unexpected and may lead to bugs in the developed application.

[quantus]

I can reproduce this issue locally on both poetry add and poetry update commands. In my case it’s always the coverage dependency that is being updated unexpectedly and after doing a bit more searching I found an existing issue #4612 which looks really similar to my situation. So something similar might have been happening here.

[quantus]

I just tested and #4618 does solve the issue I’m seeing.