• 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: Ubuntu 20.04

• Poetry version: 1.1.1

• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/MarcoGlauser/804cbf48001f7a7d1d94d6da9bc88071

Issue

The command poetry update --dry-run duplicates the output of packages as seen below.

I first noticed it in poetry 1.1.0. I could reproduce it on different machines with the attached gist.