# Uvicorn 0.47.0 — Version 0.47.0

- Product: Uvicorn (https://whatsnew.fyi/product/uvicorn)
- Vendor: Encode
- Date: 2026-05-14
- Version: 0.47.0
- Original notes: https://github.com/Kludex/uvicorn/releases/tag/0.47.0
- Permalink: https://whatsnew.fyi/product/uvicorn/releases/0.47.0

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

---

- **changed** — Eagerly import the ASGI app in the parent process
- **added** — Add ssl_context_factory for custom SSLContext configuration
- **fixed** — Treat fd=0 as a valid file descriptor with reload/workers

##### What's Changed
* Eagerly import the ASGI app in the parent process by @Kludex in https://github.com/Kludex/uvicorn/pull/2919
* Add `ssl_context_factory` for custom `SSLContext` configuration by @Kludex in https://github.com/Kludex/uvicorn/pull/2920
* Treat `fd=0` as a valid file descriptor with reload/workers by @eltoder in https://github.com/Kludex/uvicorn/pull/2927

**Full Changelog**: https://github.com/Kludex/uvicorn/compare/0.46.0...0.47.0