What PrefectHQ/prefect shipped
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Week of October 5, 2026
What shipped
- Released 3.8.8, the last release that supports Python 3.10, with bug fixes for
get_call_parametersand paging through all runs in cancellation cleanup and pause expiration monitors. Release - Released nightly 3.8.9.dev2 with UI fixes so flow run activity cells are navigable, run graph artifact icons render instead of black boxes, and run artifacts open directly from the Artifacts tab and run graph. Release
- Kept the runner healthcheck healthy while the Prefect API is in maintenance, following the same change made for workers. Pull request #23325
- Kept the worker healthcheck healthy while the API is in maintenance and gave it the normal polling window to recover after maintenance ends. Pull request #23230
- Reloaded collections after installing a missing worker integration so prefect worker start works on the first run. Pull request #23237
- Allowed prefect work-pool update --concurrency-limit 0 to set the limit to zero instead of treating it as not provided. Pull request #23299
- Made work-pool preview and work-queue preview respect the --hours window when listing scheduled runs. Pull request #23300
- Fixed
create_default_prefect_yamlraising a TypeError when the optional contents argument is omitted or None. Pull request #23334 - Fixed failed state losing metadata during retry so retry rules see the original state details. Pull request #23256
- Passed the configured botname to NotifyMattermost so the name is no longer dropped at send time. Pull request #23281
Why it matters
This week brought a stable release that is the last to support Python 3.10, plus a nightly with several UI fixes for run graphs, artifacts and activity navigation. Work also continued on making worker and runner healthchecks stay healthy during API maintenance windows, and on clearing configuration bugs in work pools, blocks and notifications. For people running flows, the fixes touch retries, caching, hooks and collection loading.
Changelog entry
- Release 3.8.8: last release supporting Python 3.10, with bug fixes for
get_call_parametersand run paging in cancellation cleanup and pause expiration monitors. Release - Nightly 3.8.9.dev1: dropped Python 3.10 support. Release
- Nightly 3.8.9.dev2: flow run activity cells are navigable, run graph artifact icons render correctly, and run artifacts open directly from the Artifacts tab and run graph. Release
- Runner webserver healthcheck stays healthy while the Prefect API is in maintenance. Pull request #23325
- Worker healthcheck stays healthy while the API is in maintenance, with the normal polling window to recover afterwards. Pull request #23230
- Collections reload after installing a missing worker integration so prefect worker start works the first time. Pull request #23237
- Prefect work-pool update --concurrency-limit 0 now sets the limit to zero. Pull request #23299
- Work-pool preview and work-queue preview respect --hours when listing scheduled runs. Pull request #23300
- Create_default_prefect_yaml no longer raises TypeError when contents is omitted or None. Pull request #23334
- Failed state no longer loses metadata during retry. Pull request #23256
- NotifyMattermost now receives the configured botname. Pull request #23281
- Log and event text search treats underscore and percent literally on the database path. Pull request #23214
Released Prefect 3.8.8, the last version supporting Python 3.10. Also shipped: runner and worker healthchecks stay healthy during API maintenance, work-pool update accepts --concurrency-limit 0, --hours is respected in previews, and UI fixes for run graphs and artifacts. Nightly
This week Prefect 3.8.8 shipped as the last release supporting Python 3.10, with fixes for get_call_parameters and for paging through all runs in cancellation cleanup and pause expiration monitors. A nightly, 3.8.9.dev2, followed with UI fixes: flow run activity cells are navigable, run graph artifact icons render instead of black boxes, and run artifacts open directly from the Artifacts tab and run graph. Runner and worker healthchecks now stay healthy while the Prefect API is in maintenance. Other fixes let prefect work-pool update --concurrency-limit 0 set a zero limit, made work-pool and work-queue previews respect --hours, reloaded collections after installing a missing worker integration, and passed the configured botname to NotifyMattermost.
Week of September 28, 2026
What shipped
- Fixed
retry_jitter_factorto actually apply jitter to retry delays as documented, resolving a gap between documentation and implementation in the task engine. Pull request #23222 - Fixed cancellation cleanup and pause expiration monitors to page through all matching runs, ensuring child flows are properly handled regardless of volume. Pull request #23240
- Fixed
get_call_parametersto correctly unwrap FieldInfo defaults for flow runs. Pull request #23228 - Corrected misleading cron schedule help text that reversed the OR/AND logic explanation. Pull request #23238
- Docker image now installs locked dependency versions instead of resolving fresh at build time, ensuring consistent environments. Pull request #23225
- Released prefect-shell 0.3.7 with updated logo URLs. Release
Why it matters
This week addresses several correctness issues that improve reliability of flow execution and monitoring. The retry jitter fix ensures retries behave as documented, the cancellation monitor fix prevents incomplete cleanup of large flow runs, and the Docker image change ensures reproducible deployments.
Changelog entry
- Apply
retry_jitter_factorin the task engine Pull request #23222 - Page through all runs in cancellation cleanup and pause expiration monitors Pull request #23240
- Fix
get_call_parametersto unwrap FieldInfo defaults for flow runs Pull request #23228 - Fix misleading cron schedule help text Pull request #23238
- Install locked dependency versions in Docker image Pull request #23225
- Bump virtualenv from 21.7.1 to 21.7.12 Release
- Bump oauthlib from 3.3.1 to 4.0.0 Release
- Release prefect-shell 0.3.7 Release
3.8.8.dev releases this week: retry_jitter_factor now works as documented, cancellation monitors handle large flow volumes, Docker builds use locked dependencies for consistency.
This week's Prefect updates focus on correctness and reliability. Retry jitter now properly applies to retry delays as documented. Cancellation and pause monitors now page through all runs, ensuring complete cleanup regardless of volume. Docker images now use locked dependency versions, providing reproducible builds. These fixes improve the consistency between documented behavior and actual behavior.
Week of September 21, 2026
What shipped
- Version 3.8.7 released with browser-local pinned deployments in the React UI, allowing users to pin deployments that sort to the top of the list using browser storage. Release
- Pinned deployments can be set from the deployment table row or details page, with pins stored in the browser's localStorage rather than on the server. Pull request #23143
- Fixed retry budget for completed subflows when a parent flow retries, giving the child a fresh run with its configured retries while preserving the previous Completed run's state. Pull request #23153
- Fixed interval form to display correct remaining time values and show the selected time unit when editing schedules. Pull request #23209
- Fixed event publisher to log the actual size of oversized events that are refused for publication. Pull request #23180
- Added support for rendering data:image/* URIs in ui-v2 markdown content. Release
- Modernized prefect-dbt type annotations to Python 3.10+ syntax. Pull request #23081
- Fixed falsy values like blank strings and zeroes being rendered as empty in the variables table. Pull request #23096
- Fixed date range selection for relative time queries that were selecting the previous period instead of the next. Pull request #23081
- PrefectDbtRunner now raises an error when dbt nodes are skipped during execution. Pull request #23050
Why it matters
Version 3.8.7 introduces browser-local pinned deployments for UI organization and fixes critical issues with subflow retries, scheduling forms, and event logging. These changes improve both user experience and reliability of flow execution and state management.
Changelog entry
- Add browser-local pinned deployments to the React UI Release
- Format deployment Created/Updated timestamps in ui-v2 metadata Release
- Fix retry budget for completed subflows on parent retry Release
- Fix reading results persisted to an unsaved local filesystem Release
- Log the real size when refusing to publish an oversized event Pull request #23180
- Fix interval form showing incorrect value and time unit Pull request #23209
- Render data:image/* URIs in ui-v2 markdown Release
- Fix falsy variables rendered as blank Pull request #23096
- Fix next date selection selecting previous date Pull request #23081
- Raise on skipped dbt nodes in PrefectDbtRunner Pull request #23050
Prefect 3.8.7 is out. Pin deployments in the React UI using browser storage, fix subflow retry budgets, and improve scheduling form display.
Prefect 3.8.7 brings browser-local pinned deployments to the React UI for better deployment organization, fixes retry budget handling for completed subflows on parent retry, and resolves scheduling form display issues. These improvements enhance both usability and flow execution reliability.
Week of September 14, 2026
What shipped
- Version 3.8.6 released with pause and cancellation improvements, including the ability to cancel blocking paused flow runs after pause timeout elapses. Release
- Fixed date range selector on flow runs page so clicking cancel no longer incorrectly selects 'All time'. Pull request #23148
- Version 3.8.7.dev2 includes deployment timestamp formatting in UI v2 metadata and improved dark-mode readability for flow run cards. Release
- Fixed shell assertion tests in prefect-shell integration that were not actually validating the launched shell type. Pull request #23144
- Fixed multiple test assertions that were being evaluated but not actually checked, preventing test failures from being caught. Pull request #23141
- Version 3.8.7.dev1 fixes V2 run-list wrapping and toolbar overflow issues at constrained widths. Release
- Nightly releases now build only wheels instead of source distributions, and UI source maps are disabled to reduce PyPI storage growth. Pull request #23120
- Version 3.8.7.dev3 restores deployment, work pool, and work queue links on V2 flow-run cards and shows tag names inline. Release
- Added native Redis Sentinel support to prefect-redis integration. Pull request #22377
- Added Osano consent manager configuration to Prefect 3 documentation. Pull request #23133
Why it matters
This week brings flow run improvements and UI fixes in 3.8.6 along with several development releases. The release focuses on pause and cancellation workflows, while bug fixes address both test reliability and user-facing issues like date filtering in the UI.
Changelog entry
- Allow cancelling a blocking paused flow run after its pause timeout elapses Release
- Allow transitioning to cancelling from paused state Release
- Reduce task run recorder INSERT compilation CPU Release
- Fix date clearing on cancel in flow runs page date range selector Pull request #23148
- Format deployment Created/Updated timestamps in ui-v2 metadata Release
- Improve dark-mode readability of flow run cards Release
- Fix V2 run-list wrapping and toolbar overflow at constrained widths Release
- Omit UI source maps and build only wheels for nightly prefect releases Pull request #23120
- Show tag names inline and make tag overflow focusable Release
- Restore deployment, work pool, and work queue links on V2 flow-run cards Release
- Add Redis Sentinel support to prefect-redis Pull request #22377
Prefect 3.8.6 is out with pause/cancellation improvements including blocking paused flow run cancellation after timeout. UI fixes address date filtering and overflow issues.
Prefect 3.8.6 is now available with enhanced pause and cancellation workflows. This release allows you to cancel blocking paused flow runs after the pause timeout elapses, improving control over long-running flows. Recent development builds have also addressed UI reliability with fixes to flow run list wrapping, date range selection, and dark mode readability in v2.