# Prefect 3.8.5.dev2 — 3.8.5.dev2: Nightly Development Release

- Product: Prefect (https://whatsnew.fyi/product/prefect)
- Vendor: Prefect
- Date: 2026-08-28
- Version: 3.8.5.dev2
- Original notes: https://github.com/PrefectHQ/prefect/releases/tag/3.8.5.dev2
- Permalink: https://whatsnew.fyi/product/prefect/releases/3.8.5.dev2
- 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'.

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- **fixed** — Fix selecting enum dropdown in Quick Run dialog navigating away
- **fixed** — Cache Redis messaging URL lookup
- **fixed** — Fix CI pyright check that silently analyzed 0 files
- **fixed** — Make prefect_test_harness settings visible in isolated asyncio test cases
- **fixed** — Keep deployment concurrency lease across flow retry transitions
- **changed** — Reduce event persister INSERT compilation CPU

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

##### What's Changed
###### Bug Fixes 🐞
* fix(ui-v2): selecting enum dropdown in Quick Run dialog navigates away by @vyagubov in https://github.com/PrefectHQ/prefect/pull/22953
* Add deployments-list regression test for the quick run enum dropdown by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22955
* Cache Redis messaging URL lookup by @chuqCTC in https://github.com/PrefectHQ/prefect/pull/22950
* Fix CI pyright check that silently analyzed 0 files by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22827
* Make prefect_test_harness settings visible in isolated asyncio test cases by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22962
* Keep deployment concurrency lease across flow retry transitions by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22886
###### Documentation 📓
* fix python client example in tag-concurrency doc by @uinstinct in https://github.com/PrefectHQ/prefect/pull/22770
###### Uncategorized
* Reduce event persister INSERT compilation CPU by @chuqCTC in https://github.com/PrefectHQ/prefect/pull/22961
* Fix the four pyright errors that fail static analysis on main by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22963


**Full Changelog**: https://github.com/PrefectHQ/prefect/compare/3.8.5.dev1...3.8.5.dev2