Prefect

Name: Prefect
Author: Prefect

Developer Tools

Turns Python functions into observable, retryable workflow runs.

Latest 3.8.2 · Aug 7, 2026by PrefectWebsite PrefectHQ/prefect

Release activity

Release activity — 10 releases across 8 days since Jul 29, 2026. Each cell is one day; darker means more releases that day. Nothing is recorded before Jul 29, 2026. Older weeks are hidden at this screen width.
		Aug
Sunday		No releases on Aug 2, 2026	No releases on Aug 9, 2026
Monday		1 release on Aug 3, 2026	No releases on Aug 10, 2026
Tuesday		1 release on Aug 4, 2026	No releases on Aug 11, 2026
Wednesday	1 release on Jul 29, 2026	1 release on Aug 5, 2026
Thursday	2 releases on Jul 30, 2026	1 release on Aug 6, 2026
Friday	No releases on Jul 31, 2026	2 releases on Aug 7, 2026
Saturday	1 release on Aug 1, 2026	No releases on Aug 8, 2026

10 releases since Jul 29, 2026, busiest day 2

Changelog

3.8.2Aug 7, 2026 · 3 days ago

3.8.2 - Array we there yet?

Added 3

Add removable chips for multi-select enum array fields
Send a Prefect User-Agent on WebSocket handshakes
Virtualize the timezone select option list

Fixed 9

Show all timezones in the timezone select
Propagate array item edits and link deployments from the flow page
Preserve an empty array when clearing list parameter selections
Open the date picker calendar on the selected date's month
Normalize settings paths for cross-OS context transport
Raise ValueError for negative timeouts in PrefectFutureList.result, as_completed, and wait
Fix a tooltip hiding behind a chart row
Release concurrency leases granted to callers that were cancelled mid-acquire
Keep setuptools in conda Docker images

Enhancements ➕➕

Add removable chips for multi-select enum array fields by @vyagubov in #22738
Send a Prefect User-Agent on WebSocket handshakes by @devin-ai-integration[bot] in #22706
Virtualize the timezone select option list by @devin-ai-integration[bot] in #22740

Bug Fixes 🐞

Show all timezones in the timezone select by @devin-ai-integration[bot] in #22686
Propagate array item edits and link deployments from the flow page by @devin-ai-integration[bot] in #22726
Preserve an empty array when clearing list parameter selections by @vyagubov in #22737
Open the date picker calendar on the selected date's month by @devin-ai-integration[bot] in #22699
Normalize settings paths for cross-OS context transport by @devin-ai-integration[bot] in #22700
Raise ValueError for negative timeouts in PrefectFutureList.result, as_completed, and wait by @kingsley-123 in #22692
Fix a tooltip hiding behind a chart row by @uinstinct in #22707
Release concurrency leases granted to callers that were cancelled mid-acquire by @devin-ai-integration[bot] in #22621
Keep setuptools in conda Docker images by @devin-ai-integration[bot] in #22743

Development & Tidiness 🧹

Migrate to Renovate and retire Dependabot by @jamiezieziula in #22719

Documentation 📓

Document how follows establishes event ordering for automation triggers by @chrisguidry in #22710
Correct event trigger examples to match actual matching semantics by @bunchesofdonald in #22690
Fix incorrect examples in the global concurrency limits docs by @uinstinct in #22724
Fix text not visible in an image by @uinstinct in #22661
Fix docstring Args entries that name a parameter the function does not take by @darkdi in #22733
List 3.7 and 3.8 release notes and link the Prefect Cloud changelog by @devin-ai-integration[bot] in #22702

Full Changelog: https://github.com/PrefectHQ/prefect/compare/3.8.1...3.8.2

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3.8.2.dev6Pre-releaseAug 7, 2026 · 4 days ago

3.8.2.dev6: Nightly Development Release

Fixed 2

Preserve empty array when clearing list parameter selections in UI v2
Fix docstring Args entries that name a parameter the function does not take

What's Changed

Bug Fixes 🐞

fix(ui-v2): preserve empty array when clearing list parameter selections by @vyagubov in https://github.com/PrefectHQ/prefect/pull/22737

Uncategorized

Fix docstring Args entries that name a parameter the function does not take by @darkdi in https://github.com/PrefectHQ/prefect/pull/22733

New Contributors

@darkdi made their first contribution in https://github.com/PrefectHQ/prefect/pull/22733

Full Changelog: https://github.com/PrefectHQ/prefect/compare/3.8.2.dev5...3.8.2.dev6

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3.8.2.dev5Pre-releaseAug 6, 2026 · 5 days ago

3.8.2.dev5: Nightly Development Release

Changed 1

Migrate to Renovate and retire Dependabot

Fixed 4

Don't treat a missing Redis stream as a connection error when trimming
Crash flow runs when a Vertex AI job fails before the container starts
Propagate array item edits and link deployments from flow page in UI
Suppress CloudFormation validation warnings in ECS worker CDK synthesis

What's Changed

Bug Fixes 🐞

Don't treat a missing Redis stream as a connection error when trimming by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22722
Crash flow runs when a Vertex AI job fails before the container starts by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22728
fix(ui-v2): propagate array item edits and link deployments from flow page by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22726

Documentation 📓

fix(prefect-aws): suppress CloudFormation validation warnings in ECS worker CDK synthesis by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22715
fix incorrect examples in global-concurrency-limits doc by @uinstinct in https://github.com/PrefectHQ/prefect/pull/22724

Uncategorized

feat(renovate): migrate to Renovate, retire Dependabot by @jamiezieziula in https://github.com/PrefectHQ/prefect/pull/22719

Full Changelog: https://github.com/PrefectHQ/prefect/compare/3.8.2.dev4...3.8.2.dev5

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3.8.2.dev4Pre-releaseAug 5, 2026 · 6 days ago

3.8.2.dev4: Nightly Development Release

Changed 1

Send Prefect User-Agent on WebSocket handshakes

Fixed 2

Document how `follows` establishes event ordering for automation triggers
Fix tooltip hiding behind chart row

What's Changed

Bug Fixes 🐞

Document how follows establishes event ordering for automation triggers by @chrisguidry in https://github.com/PrefectHQ/prefect/pull/22710

Development & Tidiness 🧹

chore(deps): bump github/codeql-action from 4 to 4.37.4 by @dependabot[bot] in https://github.com/PrefectHQ/prefect/pull/22703

Documentation 📓

docs: Add release notes for prefect-kubernetes==0.7.12, prefect-redis==0.2.14, prefect-aws==0.7.11, and prefect-slack==0.4.0 by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22709
docs: List 3.7 and 3.8 release notes and link Prefect Cloud changelog by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22702

Uncategorized

Send Prefect User-Agent on WebSocket handshakes by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22706
fix tooltip hiding behind chart row by @uinstinct in https://github.com/PrefectHQ/prefect/pull/22707

Full Changelog: https://github.com/PrefectHQ/prefect/compare/3.8.2.dev3...3.8.2.dev4

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3.8.2.dev3Pre-releaseAug 4, 2026 · 7 days ago

3.8.2.dev3: Nightly Development Release

Fixed 4

Show all timezones in the ui-v2 timezone select
Open date picker calendar on the selected date's month in ui-v2
Normalize settings paths for cross-OS context transport
Raise ValueError for negative timeout in PrefectFutureList.result, as_completed, and wait

What's Changed

Bug Fixes 🐞

Show all timezones in the ui-v2 timezone select by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22686

Documentation 📓

fix text not visible in image by @uinstinct in https://github.com/PrefectHQ/prefect/pull/22661

Uncategorized

fix(ui-v2): open date picker calendar on the selected date's month by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22699
fix(context): normalize settings paths for cross-OS context transport by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22700
fix: raise ValueError for negative timeout in PrefectFutureList.result, as_completed, and wait by @kingsley-123 in https://github.com/PrefectHQ/prefect/pull/22692

Full Changelog: https://github.com/PrefectHQ/prefect/compare/3.8.2.dev2...3.8.2.dev3

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3.8.2.dev2Pre-releaseAug 3, 2026 · 8 days ago

3.8.2.dev2: Nightly Development Release

Changed 1

Bump docker/login-action from 4.5.2 to 4.6.0

What's Changed

Development & Tidiness 🧹

chore(deps): bump docker/login-action from 4.5.2 to 4.6.0 by @dependabot[bot] in https://github.com/PrefectHQ/prefect/pull/22697

Full Changelog: https://github.com/PrefectHQ/prefect/compare/3.8.2.dev1...3.8.2.dev2

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3.8.2.dev1Pre-releaseAug 1, 2026 · 10 days ago

3.8.2.dev1: Nightly Development Release

Changed 1

Correct event trigger examples to match actual matching semantics

What's Changed

Development & Tidiness 🧹

chore(deps): bump docker/login-action from 4 to 4.5.2 by @dependabot[bot] in https://github.com/PrefectHQ/prefect/pull/22688

Documentation 📓

docs: Correct event trigger examples to match actual matching semantics by @bunchesofdonald in https://github.com/PrefectHQ/prefect/pull/22690

Full Changelog: https://github.com/PrefectHQ/prefect/compare/3.8.1...3.8.2.dev1

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3.8.1Jul 30, 2026 · 11 days ago

3.8.1 - To relinquish, perchance to retry

Added 1

Show tooltips for flow run state tabs in the V2 UI

Fixed 11

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

Enhancements ➕➕

Show tooltips for flow run state tabs in the V2 UI by @uinstinct in #22617

Bug Fixes 🐞

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

Development & Tidiness 🧹

Fix codespell error on unit test TEST_BLOCK_CODE_BAD_SYNTAX on Windows by @g-ringeisen in #22642
Drop unused global mintlify-scrape install from static analysis by @devin-ai-integration[bot] in #22677

Documentation 📓

Add missing line break after imports in documentation examples by @uinstinct in #22627
Document Submitting and InfrastructurePending states by @devin-ai-integration[bot] in #22660
Fix flows documentation link to the getting started page by @uinstinct in #22648

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

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3.8.1.dev5Pre-releaseJul 30, 2026 · 12 days ago

3.8.1.dev5: Nightly Development Release

Changed 2

Clear stale expiration entries when a repossessed lease is missing
Reject unknown fields for FlowRunFilter and its nested criteria

Fixed 2

Confirm the exact suspension transition reported by a suspension event
Fix codspell error on unit test TEST_BLOCK_CODE_BAD_SYNTAX on Windows

What's Changed

Bug Fixes 🐞

Confirm the exact suspension transition reported by a suspension event by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22649
Fix codspell error on unit test TEST_BLOCK_CODE_BAD_SYNTAX on Windows by @g-ringeisen in https://github.com/PrefectHQ/prefect/pull/22642

Development & Tidiness 🧹

chore(deps): bump actions/stale from 10 to 11 by @dependabot[bot] in https://github.com/PrefectHQ/prefect/pull/22656
Clear stale expiration entries when a repossessed lease is missing by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22657

Documentation 📓

docs: document Submitting and InfrastructurePending states by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22660

Uncategorized

Reject unknown fields for FlowRunFilter and its nested criteria by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22659

New Contributors

@g-ringeisen made their first contribution in https://github.com/PrefectHQ/prefect/pull/22642

Full Changelog: https://github.com/PrefectHQ/prefect/compare/3.8.1.dev4...3.8.1.dev5

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3.8.1.dev4Pre-releaseJul 29, 2026 · 13 days ago

3.8.1.dev4: Nightly Development Release

Fixed 3

Make PrefectFutureList.result timeout message reachable
Render ANSI color escape codes in flow run logs
Scope pull_from_s3 listing to the requested folder

What's Changed

Bug Fixes 🐞

fix(futures): make PrefectFutureList.result timeout message reachable by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22634
fix(ui-v2): render ANSI color escape codes in flow run logs by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22653

Documentation 📓

docs: add missing line break after imports by @uinstinct in https://github.com/PrefectHQ/prefect/pull/22627

Uncategorized

fix(prefect-aws): scope pull_from_s3 listing to the requested folder by @devin-ai-integration[bot] in https://github.com/PrefectHQ/prefect/pull/22647
docs: fix flows doclink linking to get started page by @uinstinct in https://github.com/PrefectHQ/prefect/pull/22648

Full Changelog: https://github.com/PrefectHQ/prefect/compare/3.8.1.dev3...3.8.1.dev4

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