# Prefect 3.8.5.dev4 — 3.8.5.dev4: Nightly Development Release

- Product: Prefect (https://whatsnew.fyi/product/prefect)
- Vendor: Prefect
- Date: 2026-09-01
- Version: 3.8.5.dev4
- Original notes: https://github.com/PrefectHQ/prefect/releases/tag/3.8.5.dev4
- Permalink: https://whatsnew.fyi/product/prefect/releases/3.8.5.dev4
- Labels: Pre-release

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** — Use current settings for resource label validation
- **fixed** — Fix two flaky tests found in Unit tests on main
- **changed** — Apply jitter around the backed off interval in critical_service_loop

<!-- Release notes generated using configuration in .github/release.yml at main -->

##### What's Changed
###### Enhancements ➕➕
* Use current settings for resource label validation by @chuqCTC in https://github.com/PrefectHQ/prefect/pull/22959
###### Development & Tidiness 🧹
* Fix two flaky tests found in Unit tests on main by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22977
###### Uncategorized
* Apply jitter around the backed off interval in critical_service_loop by @ethanstoner in https://github.com/PrefectHQ/prefect/pull/22980

##### New Contributors
* @ethanstoner made their first contribution in https://github.com/PrefectHQ/prefect/pull/22980

**Full Changelog**: https://github.com/PrefectHQ/prefect/compare/3.8.5.dev3...3.8.5.dev4