1.4.3 (2026-04-10)

Features

- Add ``kind`` parameter to log messages to separate semantic and representation - by :user:`abitrolly` (:issue:`973`)

Bugfixes

- Strip ``PYTHONPATH`` from the environment during isolated builds to prevent host packages from leaking into the build -

by :user:`gaborbernat` (:issue:`405`)

- Pass ``--no-input`` to pip to prevent hidden credential prompts that cause hangs, and automatically set

``PIP_KEYRING_PROVIDER=subprocess`` (or ``UV_KEYRING_PROVIDER=subprocess`` for the uv installer) when the ``keyring``

CLI is on ``PATH`` -- by :user:`gaborbernat` (:issue:`409`)

- ``check_dependency`` now reports URL requirements as unmet instead of silently accepting them when a package with the

same name is installed - by :user:`gaborbernat` (:issue:`860`)

- Fix misleading missing dependency error display where transitive dependency chains showed the top-level package on a

separate line, making it appear as if the top-level package itself was missing - by :user:`gaborbernat` (:issue:`875`)

- Fix towncrier template to generate changelog categories in definition order - by :user:`gaborbernat` (:issue:`1007`)

- Resolve thread-safety races in the build API - by :user:`gaborbernat` (:issue:`1015`)

- Validate ``backend-path`` entries exist on disk with a clear error - by :user:`gaborbernat` (:issue:`1016`)

Miscellaneous

- :issue:`1020`, :issue:`1021`