# What changed in backports-zstd

> 12 changes in backports-zstd 1 from its official release notes, upgrade guides and advisories: 3 breaking. Each one cited. Sources checked 2026-10-21. HTML: https://unstale.sh/pypi/backports-zstd/

To see which of these apply to a repository, run `npx @unstale/cli init` in it.

## backports-zstd 1

### Breaking changes

- Wheels are no longer built for CPython 3.13 free-threading. (1.4.0) — [release notes](https://github.com/rogdham/backports.zstd/blob/2372ea098b7b87430293c8344888e01ad3d1d04d/CHANGELOG.md#140---2026-05-03)
- Support for CPython 3.9 was removed, so developers using this release need a newer CPython version. (1.4.0) — [release notes](https://github.com/rogdham/backports.zstd/blob/2372ea098b7b87430293c8344888e01ad3d1d04d/CHANGELOG.md#140---2026-05-03)
- Using an unsupported Python version now raises an exception at build and runtime instead of potentially causing a runtime segmentation fault. (1.3.0) — [release notes](https://github.com/rogdham/backports.zstd/blob/2372ea098b7b87430293c8344888e01ad3d1d04d/CHANGELOG.md#130---2025-12-29)

### Performance

- Lazy loading register_shutil shortens import time. (1.1.0) — [release notes](https://github.com/rogdham/backports.zstd/blob/2372ea098b7b87430293c8344888e01ad3d1d04d/CHANGELOG.md#110---2025-11-23)

### Behavior and default changes

- The package now supports PyPy with Python 3.12. (1.8.0) — [release notes](https://github.com/rogdham/backports.zstd/blob/2372ea098b7b87430293c8344888e01ad3d1d04d/CHANGELOG.md#180---2026-10-10)

### Tooling

- Wheels are now built for Android, providing wheel packages for that platform. (1.4.0) — [release notes](https://github.com/rogdham/backports.zstd/blob/2372ea098b7b87430293c8344888e01ad3d1d04d/CHANGELOG.md#140---2026-05-03)
- Wheels are now built for iOS, providing wheel packages for that platform. (1.4.0) — [release notes](https://github.com/rogdham/backports.zstd/blob/2372ea098b7b87430293c8344888e01ad3d1d04d/CHANGELOG.md#140---2026-05-03)
- Type hints were updated using the specified typeshed revision. (1.3.0) — [release notes](https://github.com/rogdham/backports.zstd/blob/2372ea098b7b87430293c8344888e01ad3d1d04d/CHANGELOG.md#180---2026-10-10), [release notes](https://github.com/rogdham/backports.zstd/blob/2372ea098b7b87430293c8344888e01ad3d1d04d/CHANGELOG.md#130---2025-12-29)
- Wheels are now built for riscv64, making the package available on that architecture. (1.2.0) — [release notes](https://github.com/rogdham/backports.zstd/blob/2372ea098b7b87430293c8344888e01ad3d1d04d/CHANGELOG.md#120---2025-12-06)

### Fixes and other changes

- The code was updated to the CPython 3.14.8 version. (1.8.0) — [release notes](https://github.com/rogdham/backports.zstd/blob/2372ea098b7b87430293c8344888e01ad3d1d04d/CHANGELOG.md#180---2026-10-10)
- The package is now an implicit namespace package, resolving a conflict with the `__init__.py` file in the `backports` root module. (1.3.0) — [release notes](https://github.com/rogdham/backports.zstd/blob/2372ea098b7b87430293c8344888e01ad3d1d04d/CHANGELOG.md#130---2025-12-29)
- Fixes an assertion on Python 3.13 when building with DEBUG. (1.1.0) — [release notes](https://github.com/rogdham/backports.zstd/blob/2372ea098b7b87430293c8344888e01ad3d1d04d/CHANGELOG.md#110---2025-11-23)