# Prefect 3.8.1 — 3.8.1 - To relinquish, perchance to retry

- Product: Prefect (https://whatsnew.fyi/product/prefect)
- Vendor: Prefect
- Date: 2026-07-30
- Version: 3.8.1
- Original notes: https://github.com/PrefectHQ/prefect/releases/tag/3.8.1
- Permalink: https://whatsnew.fyi/product/prefect/releases/3.8.1

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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- **added** — Show tooltips for flow run state tabs in the V2 UI
- **fixed** — Make ConcurrencyContext exit cleanup best-effort
- **fixed** — Keep worker startup alive when the Prefect API is unreachable
- **fixed** — Make PrefectFutureList.result timeout message reachable
- **fixed** — Render ANSI color escape codes in flow run logs in the V2 UI
- **fixed** — Confirm the exact suspension transition reported by a suspension event
- **fixed** — Allow any float precision on schema number inputs in the V2 UI
- **fixed** — Reject unknown fields for FlowRunFilter and its nested criteria
- **fixed** — Relinquish evicted flow runs to infrastructure retry
- **fixed** — Fix saved block parameters in deployments
- **fixed** — Preserve subprocesses after output stream errors
- **fixed** — Clear stale expiration entries when a repossessed lease is missing

**Enhancements ➕➕**

* Show tooltips for flow run state tabs in the V2 UI by [@uinstinct](https://github.com/uinstinct) in [#22617](https://github.com/PrefectHQ/prefect/pull/22617)

**Bug Fixes 🐞**

* Make `ConcurrencyContext` exit cleanup best-effort by [@devin-ai-integration](https://github.com/devin-ai-integration)[bot] in [#22619](https://github.com/PrefectHQ/prefect/pull/22619)
* Keep worker startup alive when the Prefect API is unreachable by [@devin-ai-integration](https://github.com/devin-ai-integration)[bot] in [#22640](https://github.com/PrefectHQ/prefect/pull/22640)
* Make `PrefectFutureList.result` timeout message reachable by [@devin-ai-integration](https://github.com/devin-ai-integration)[bot] in [#22634](https://github.com/PrefectHQ/prefect/pull/22634)
* Render ANSI color escape codes in flow run logs in the V2 UI by [@devin-ai-integration](https://github.com/devin-ai-integration)[bot] in [#22653](https://github.com/PrefectHQ/prefect/pull/22653)
* Confirm the exact suspension transition reported by a suspension event by [@devin-ai-integration](https://github.com/devin-ai-integration)[bot] in [#22649](https://github.com/PrefectHQ/prefect/pull/22649)
* Allow any float precision on schema number inputs in the V2 UI by [@AJ-ing](https://github.com/AJ-ing) in [#22643](https://github.com/PrefectHQ/prefect/pull/22643)
* Reject unknown fields for `FlowRunFilter` and its nested criteria by [@devin-ai-integration](https://github.com/devin-ai-integration)[bot] in [#22659](https://github.com/PrefectHQ/prefect/pull/22659)
* Relinquish evicted flow runs to infrastructure retry by [@chuqCTC](https://github.com/chuqCTC) in [#22622](https://github.com/PrefectHQ/prefect/pull/22622)
* Fix saved block parameters in deployments by [@desertaxle](https://github.com/desertaxle) in [#22568](https://github.com/PrefectHQ/prefect/pull/22568)
* Preserve subprocesses after output stream errors by [@desertaxle](https://github.com/desertaxle) in [#22573](https://github.com/PrefectHQ/prefect/pull/22573)
* Clear stale expiration entries when a repossessed lease is missing by [@devin-ai-integration](https://github.com/devin-ai-integration)[bot] in [#22657](https://github.com/PrefectHQ/prefect/pull/22657)

**Development & Tidiness 🧹**

* Fix codespell error on unit test `TEST_BLOCK_CODE_BAD_SYNTAX` on Windows by [@g-ringeisen](https://github.com/g-ringeisen) in [#22642](https://github.com/PrefectHQ/prefect/pull/22642)
* Drop unused global `mintlify-scrape` install from static analysis by [@devin-ai-integration](https://github.com/devin-ai-integration)[bot] in [#22677](https://github.com/PrefectHQ/prefect/pull/22677)

**Documentation 📓**

* Add missing line break after imports in documentation examples by [@uinstinct](https://github.com/uinstinct) in [#22627](https://github.com/PrefectHQ/prefect/pull/22627)
* Document `Submitting` and `InfrastructurePending` states by [@devin-ai-integration](https://github.com/devin-ai-integration)[bot] in [#22660](https://github.com/PrefectHQ/prefect/pull/22660)
* Fix flows documentation link to the getting started page by [@uinstinct](https://github.com/uinstinct) in [#22648](https://github.com/PrefectHQ/prefect/pull/22648)

**Full Changelog**: https://github.com/PrefectHQ/prefect/compare/3.8.0...3.8.1