- Improve performance of wheel inspection by avoiding unnecessary file copy operations ([#7916](https://github.com/python-poetry/poetry/pull/7916)).
### Changed
-**Remove the old deprecated installer and the corresponding setting `experimental.new-installer`** ([#7356](https://github.com/python-poetry/poetry/pull/7356)).
-**Introduce `priority` key for sources and deprecate flags `default` and `secondary`** ([#7658](https://github.com/python-poetry/poetry/pull/7658)).
- Deprecate `poetry run <script>` if the script was not previously installed via `poetry install` ([#7606](https://github.com/python-poetry/poetry/pull/7606)).
- Only write the lock file if the installation succeeds ([#7498](https://github.com/python-poetry/poetry/pull/7498)).
- Do not write the unused package category into the lock file ([#7637](https://github.com/python-poetry/poetry/pull/7637)).
### Fixed
- Fix an issue where Poetry's internal pyproject.toml continually grows larger with empty lines ([#7705](https://github.com/python-poetry/poetry/pull/7705)).
- Fix an issue where Poetry crashes due to corrupt cache files ([#7453](https://github.com/python-poetry/poetry/pull/7453)).
- Fix an issue where the `Retry-After` in HTTP responses was not respected and retries were handled inconsistently ([#7072](https://github.com/python-poetry/poetry/pull/7072)).
- Fix an issue where Poetry silently ignored invalid groups ([#7529](https://github.com/python-poetry/poetry/pull/7529)).
- Fix an issue where Poetry does not find a compatible Python version if not given explicitly ([#7771](https://github.com/python-poetry/poetry/pull/7771)).
- Fix an issue where the `direct_url.json` of an editable install from a git dependency was invalid ([#7473](https://github.com/python-poetry/poetry/pull/7473)).
- Fix an issue where error messages from build backends were not decoded correctly ([#7781](https://github.com/python-poetry/poetry/pull/7781)).
- Fix an infinite loop when adding certain dependencies ([#7405](https://github.com/python-poetry/poetry/pull/7405)).
- Fix an issue where pre-commit hooks skip pyproject.toml files in subdirectories ([#7239](https://github.com/python-poetry/poetry/pull/7239)).
- Fix an issue where pre-commit hooks do not use the expected Python version ([#6989](https://github.com/python-poetry/poetry/pull/6989)).
- Fix an issue where an unclear error message is printed if the project name is the same as one of its dependencies ([#7757](https://github.com/python-poetry/poetry/pull/7757)).
- Fix an issue where `poetry install` returns a zero exit status even though the build script failed ([#7812](https://github.com/python-poetry/poetry/pull/7812)).
- Fix an issue where an existing `.venv` was not used if `in-project` was not set ([#7792](https://github.com/python-poetry/poetry/pull/7792)).
- Fix an issue where multiple extras passed to `poetry add` were not parsed correctly ([#7836](https://github.com/python-poetry/poetry/pull/7836)).
- Fix an issue where `poetry shell` did not send a newline to `fish` ([#7884](https://github.com/python-poetry/poetry/pull/7884)).
- Fix an issue where `poetry update --lock` printed operations that were not executed ([#7915](https://github.com/python-poetry/poetry/pull/7915)).
- Fix an issue where `poetry add --lock` did perform a full update of all dependencies ([#7920](https://github.com/python-poetry/poetry/pull/7920)).
- Fix an issue where `poetry shell` did not work with `nushell` ([#7919](https://github.com/python-poetry/poetry/pull/7919)).
- Fix an issue where subprocess calls failed on Python 3.7 ([#7932](https://github.com/python-poetry/poetry/pull/7932)).
- Fix an issue where keyring was called even though the password was stored in an environment variable ([#7928](https://github.com/python-poetry/poetry/pull/7928)).
### Docs
- Add information about what to use instead of `--dev` ([#7647](https://github.com/python-poetry/poetry/pull/7647)).
- Promote semantic versioning less aggressively ([#7517](https://github.com/python-poetry/poetry/pull/7517)).
- Explain Poetry's own versioning scheme in the FAQ ([#7517](https://github.com/python-poetry/poetry/pull/7517)).
- Update documentation for configuration with environment variables ([#6711](https://github.com/python-poetry/poetry/pull/6711)).
- Add details how to disable the virtualenv prompt ([#7874](https://github.com/python-poetry/poetry/pull/7874)).
- Improve documentation on whether to commit `poetry.lock` ([#7506](https://github.com/python-poetry/poetry/pull/7506)).
- Improve documentation of `virtualenv.create` ([#7608](https://github.com/python-poetry/poetry/pull/7608)).
- Improve error message for invalid markers ([#569](https://github.com/python-poetry/poetry-core/pull/569)).
- Increase robustness when deleting temporary directories on Windows ([#460](https://github.com/python-poetry/poetry-core/pull/460)).
- Replace `tomlkit` with `tomli`, which changes the interface of some _internal_ classes ([#483](https://github.com/python-poetry/poetry-core/pull/483)).
- Fix a performance regression in marker handling ([#568](https://github.com/python-poetry/poetry-core/pull/568)).
- Fix an issue where wildcard version constraints were not handled correctly ([#402](https://github.com/python-poetry/poetry-core/pull/402)).
- Fix an issue where `poetry build` created duplicate Python classifiers if they were specified manually ([#578](https://github.com/python-poetry/poetry-core/pull/578)).
- Fix an issue where local versions where not handled correctly ([#579](https://github.com/python-poetry/poetry-core/pull/579)).
