• 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: macOS 11.2.2
• Poetry version: 1.1.4
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/beaugunderson/cfb9a818ba42d63a1d14de7dc33a99aa

Issue

Executing poetry lock --no-update (with no changes to pyproject.toml) updates the versions of a dependency in our poetry.lock:

Additionally, when executing the same command with -vvv I get an exception in the debugging code: