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prefect 3.9.1 - This hour is a rerun

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Prefect 3.9.1 adds custom state discovery, flow run actions, and various bug fixes for task orchestration.

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Also shipped Oct 30, 2026Prefect in October 2026 →

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Prefect 3.9.0 - Pendulum's last swing

3.9.0 - Pendulum's last swing Released on October 21, 2026 Breaking Changes ⚠️ Drop Python 3.10 support Remove deprecated Runner execution paths Deprecate Pendulum datetime behavior on Python 3.11–3.12 New Features 🎉 Add Python 3.15 support Enhancements ➕➕ Add opt-in clearing for empty deployment schedules Cut CPU spent delivering events and API logs Open...

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Prefect 3.8.8 - I take my wildcards literally

This is the last release that will support Python 3.10 , future releases will require Python 3.11 or later. Bug Fixes 🐞 Fix get_call_parameters to unwrap FieldInfo defaults for flow runs Page through all runs in cancellation cleanup and pause expiration monitors Fix UnboundLocalError in observer _get_k8s_jobs when the Kubernetes client can't be created...

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Prefect 3.8.7 - There's no place like local

3.8.7 - There's no place like local Released on September 25, 2026 New Features 🎉 Add browser-local pinned deployments to the React UI Enhancements ➕➕ Format deployment Created/Updated timestamps in ui-v2 metadata Show tag names inline and make tag overflow focusable in ui-v2 Set browser tab titles on entity and index pages in ui-v2 Add...

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Prefect 3.8.6 - Pause for cancellation

Enhancements ➕➕ Reduce task run recorder INSERT compilation CPU Allow transitioning to cancelling from paused Allow cancelling a blocking paused flow run after its pause timeout elapses Bug Fixes 🐞 Fix Docker work pool editing and block/env serialization in UI v2 Treat ERROR_ACCESS_DENIED as alive in Windows _is_pid_alive Rebuild invalid...

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Prefect 3.8.5 - A little jitter never hurt anybody

Enhancements ➕➕ Suggest existing deployment tags in the V2 deployments filter Use current settings for resource label validation Add parameter overrides to the deployment schedule dialog Use indexed flow run cleanup with separate orphan reconciliation Add id fields and matching filters to automation count and filter models Reduce event persister INSERT...

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2.20.26 - Still Prefect After All These Years

Integrations & Dependencies 🤝 chore(deps): update click requirement from =8.0 to >=8.0, =21.3 to >=21.3, =0.12.0 to >=0.12.0,!=0.12.2, =1.0.4 to >=1.0.4, =0.12.0 to >=0.12.0,!=0.12.2, =2021.1 to >=2021.1, =1.0.12 to >=1.0.12,<7.0.0 Fix 2.x compatibility with current dependencies Development & Tidiness 🧹 Migrate 2.x PyPI publishing to OIDC Uncategorized...

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Prefect 3.8.4 - Seconds of the world, unite!

Enhancements ➕➕ Add time selection to the interval schedule anchor date Add a configurable base directory for included files Add an index on flow_run.deployment_id Open a parameters dialog when a quick run needs required parameters Bug Fixes 🐞 Prevent runners from overwriting handled flow-run outcomes Fix ProcessWorker auto-uv after pull steps Honor a...

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