Added

• Add a non-package mode for use cases where Poetry is only used for dependency management (#8650).
• Add support for PEP 658 to fetch metadata without having to download wheels (#5509).
• Add a lazy-wheel config option (default: true) to reduce wheel downloads during dependency resolution (#8815, #8941).
• Improve performance of dependency resolution by using shallow copies instead of deep copies (#8671).
• poetry check validates that no unknown sources are referenced in dependencies (#8709).
• Add archive validation during installation for further hash algorithms (#8851).
• Add a to key in tool.poetry.packages to allow custom subpackage names (#8791).
• Add a config option to disable keyring (#8910).
• Add a --sync option to poetry update (#8931).
• Add an --output option to poetry build (#8828).
• Add a --dist-dir option to poetry publish (#8828).

Changed

• The implicit PyPI source is disabled if at least one primary source is configured (#8771).
• Deprecate source priority default (#8771).
• Upgrade the warning about an inconsistent lockfile to an error (#8737).
• Deprecate setting installer.modern-installation to false (#8988).
• Drop support for pip<19 (#8894).
• Require requests-toolbelt>=1 (#8680).
• Allow platformdirs 4.x (#8668).
• Allow and require xattr 1.x on macOS (#8801).
• Improve venv shell activation in fish (#8804).
• Rename system to base in output of poetry env info (#8832).
• Use pretty name in output of poetry version (#8849).
• Improve error handling for invalid entries in tool.poetry.scripts (#8898).
• Improve verbose output for dependencies with extras during dependency resolution (#8834).
• Improve message about an outdated lockfile (#8962).

Fixed

• Fix an issue where poetry shell failed when Python has been installed with MSYS2 (#8644).
• Fix an issue where Poetry commands failed in a terminal with a non-UTF-8 encoding (#8608).
• Fix an issue where a missing project name caused an incomprehensible error message (#8691).
• Fix an issue where Poetry failed to install an sdist path dependency (#8682).
• Fix an issue where poetry install failed because an unused extra was not available (#8548).
• Fix an issue where poetry install --sync did not remove an unrequested extra (#8621).
• Fix an issue where poetry init did not allow specific characters in the author field (#8779).
• Fix an issue where Poetry could not download sdists from misconfigured servers (#8701).
• Fix an issue where metadata of sdists that call CLI tools of their build requirements could not be determined (#8827).
• Fix an issue where Poetry failed to use the currently activated environment (#8831).
• Fix an issue where poetry shell failed in zsh if a space was in the venv path (#7245).
• Fix an issue where scripts with extras could not be installed (#8900).
• Fix an issue where explicit sources where not propagated correctly (#8835).
• Fix an issue where debug prints where swallowed when using a build script (#8760).
• Fix an issue where explicit sources of locked dependencies where not propagated correctly (#8948).
• Fix an issue where Poetry's own environment was falsely identified as system environment (#8970).
• Fix an issue where dependencies from a setup.py were ignored silently (#9000).
• Fix an issue where environment variables for virtualenv.options were ignored (#9015).
• Fix an issue where virtualenvs.options.no-pip and virtualenvs.options.no-setuptools were not normalized (#9015).

Docs

• Replace deprecated --no-dev with --without dev in the FAQ (#8659).
• Recommend poetry-check instead of the deprecated poetry-lock pre-commit hook (#8675).
• Clarify the names of the environment variables to provide credentials for repositories (#8782).
• Add note how to install several version of Poetry in parallel (#8814).
• Improve description of poetry show --why (#8817).
• Improve documentation of poetry update (#8706).
• Add a warning about passing variables that may start with a hyphen via command line (#8850).
• Mention that the virtual environment in which Poetry itself is installed should not be activated (#8833).
• Add note about poetry run and externally managed environments (#8748).
• Update FAQ entry about tox for tox 4.x (#8658).
• Fix documentation for default format option for include and exclude value (#8852).
• Add note about tox and configured credentials (#8888).
• Add note and link how to install pipx (#8878).
• Fix examples for poetry add with git dependencies over ssh (#8911).
• Remove reference to deprecated scripts extras feature (#8903).
• Change examples to prefer --only main instead of --without dev (#8921).
• Mention that the develop attribute is a Poetry-specific feature and not propagated to other tools (#8971).
• Fix examples for adding supplemental and secondary sources (#8953).
• Add PyTorch example for explicit sources (#9006).

poetry-core (1.9.0)

• Deprecate scripts that depend on extras (#690).
• Add support for path dependencies that do not define a build system (#675).
• Update list of supported licenses (#659, #669, #678, #694).
• Rework list of files included in build artifacts (#666).
• Fix an issue where insignificant errors were printed if the working directory is not inside a git repository (#684).
• Fix an issue where the project's directory was not recognized as git repository on Windows due to an encoding issue (#685).