• [ x] I am on the latest Poetry version.
• [x ] 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 GNU Linux 20.04
• Poetry version: 1.0.5
• Link of a Gist with the contents of your pyproject.toml file:

Issue

Output in verbose mode:
poetry install -vvv
....
1: derived: Unidecode (1.1.1)
1: derived: coreapi (2.3.3)
1: derived: sentry-sdk (0.16.1)
1: derived: django-fsm (2.7.0)
1: derived: Jinja2 (2.11.2)
1: derived: djangorestframework (3.11.0)
1: derived: psycopg2 (2.8.5)
1: derived: django-deprecate-fields (0.0.4)
1: derived: jsonschema (3.2.0)
1: derived: django-cors-headers (3.4.0)
1: derived: boto3 (1.14.23)
1: derived: django-cryptography (1.0)
1: derived: django-health-check (3.12.1)
1: derived: simple-salesforce (1.10.1)
1: derived: djangorestframework-jwt (1.11.0)
Username for 'https://github.com':

Without verbose mode (poetry install) no warning is shown. Dependency check gets stuck indefinitely.

No warning in normal mode