Unable to find installation candidates for pyqt5

• 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: Raspberry pi - Raspbian 10
• Poetry version: 1.1.5
• Link of a Gist with the contents of your pyproject.toml file: pyproject.toml

Issue

I’m getting issues updating my current poetry setup. When running poetry update -vvv:

.
.
   1: Version solving took 31.418 seconds.
   1: Tried 1 solutions.

Writing lock file

Finding the necessary packages for the current system

Package operations: 1 install, 23 updates, 0 removals

  • Updating cryptography (3.4.6 -> 3.4.7): Downloading... 100%
  • Updating cryptography (3.4.6 -> 3.4.7): Installing...
  • Updating cryptography (3.4.6 -> 3.4.7)
  • Installing pyqt5-qt5 (5.15.2): Pending...
  • Installing pyqt5-qt5 (5.15.2): Failed

  RuntimeError

  Unable to find installation candidates for pyqt5-qt5 (5.15.2)

  at ~/.poetry/lib/poetry/installation/chooser.py:72 in choose_for
       68│ 
       69│             links.append(link)
       70│ 
       71│         if not links:
    →  72│             raise RuntimeError(
       73│                 "Unable to find installation candidates for {}".format(package)
       74│             )
       75│ 
       76│         # Get the best link

  • Updating sqlalchemy (1.4.2 -> 1.4.3): Downloading... 100%
  • Updating sqlalchemy (1.4.2 -> 1.4.3): Installing...
  • Updating sqlalchemy (1.4.2 -> 1.4.3)

Does this mean there is no pyqt5 version available that the other packages support? As I have no problem installing pyqt5==5.15.2 using pip.