# What changed in prophet

> 9 changes in prophet 1 from its official release notes, upgrade guides and advisories: 1 breaking, 1 new APIs and options. Each one cited. Sources checked 2026-10-25. HTML: https://unstale.sh/pypi/prophet/

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

## prophet 1

### Breaking changes

- Support for Python versions older than 3.10 was dropped. (1.4.0) — [release notes](https://github.com/facebook/prophet/releases/tag/v1.4.0)

### New APIs and options

- Optional regressor predictor models were added, with their uncertainty propagated. (1.4.0) — [release notes](https://github.com/facebook/prophet/releases/tag/v1.4.0)

### Tooling

- Full static typing support was added. (1.4.0) — [release notes](https://github.com/facebook/prophet/releases/tag/v1.4.0)

### Fixes and other changes

- Fixes cross-validation when shared seasonality conditions are used. (1.5.0) — [release notes](https://github.com/facebook/prophet/releases/tag/v1.5.0)
- Cross-validation executor pools are closed, preventing them from being left open after use. (1.5.0) — [release notes](https://github.com/facebook/prophet/releases/tag/v1.5.0)
- MAP parameter shapes are kept when the history is constant. (1.5.0) — [release notes](https://github.com/facebook/prophet/releases/tag/v1.5.0)
- The metrics list passed to performance_metrics is no longer modified. (1.5.0) — [release notes](https://github.com/facebook/prophet/releases/tag/v1.5.0)
- Prophet supports numpy 2.4. (1.3.0) — [release notes](https://github.com/facebook/prophet/releases/tag/v1.3.0)
- Prophet supports pandas 3.0. (1.3.0) — [release notes](https://github.com/facebook/prophet/releases/tag/v1.3.0)