# Prefect 3.8.3.dev3 — 3.8.3.dev3: Nightly Development Release

- Product: Prefect (https://whatsnew.fyi/product/prefect)
- Vendor: Prefect
- Date: 2026-08-13
- Version: 3.8.3.dev3
- Original notes: https://github.com/PrefectHQ/prefect/releases/tag/3.8.3.dev3
- Permalink: https://whatsnew.fyi/product/prefect/releases/3.8.3.dev3
- 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** — Send basic auth header on the self-hosted events WebSocket handshake
- **fixed** — Confirm suspension events against the flow run instead of state-by-id
- **changed** — Stop fragmenting task run recorder bulk upserts
- **added** — Show elapsed time for running flow runs in header
- **fixed** — Reject option-like Git branch values
- **fixed** — Stop leaking watcher-thread timeout enforcers

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

##### What's Changed
###### Bug Fixes 🐞
* Send basic auth header on the self-hosted events WebSocket handshake by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22813
* Confirm suspension events against the flow run instead of state-by-id by @joshuastagner in https://github.com/PrefectHQ/prefect/pull/22820
###### Documentation 📓
* fix .deploy() example in how-to versioning guide by @uinstinct in https://github.com/PrefectHQ/prefect/pull/22810
* Tidy up the task run recorder bulk upsert path by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22814
###### Uncategorized
* perf(server): stop fragmenting task run recorder bulk upserts by @chuqCTC in https://github.com/PrefectHQ/prefect/pull/22808
* (ui-v2): show elapsed time for running flow runs in header by @vyagubov in https://github.com/PrefectHQ/prefect/pull/22811
* Reject option-like Git branch values by @desertaxle in https://github.com/PrefectHQ/prefect/pull/22819
* Stop leaking watcher-thread timeout enforcers by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22817


**Full Changelog**: https://github.com/PrefectHQ/prefect/compare/3.8.3.dev2...3.8.3.dev3