• 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 10.15.6
• Poetry version: 1.0.10 and prerelease

How to reproduce?

poetry add qiskit-aer==0.6.0 to the blank env.

Issue

poetry add qiskit-aer==0.5.2 can resolve the dependency and install required packages.
However, from qiskit-aer==0.6.0, the dependency cannot be resolved, so poetry installs only qiskit-aer.

Related issue: Qiskit/qiskit-aer#880