3.6

3.6.4 - No Deployment Left Unparametrized

Released on November 21, 2025

Bug Fixes 🐞

• fix: preserve event template parameters in deployment triggers by @zzstoatzz in #19504
• Fix truncating log behavior by @jakekaplan in #19496

Integrations & Dependencies 🤝

• Chore: Bump ui library by @znicholasbrown in #19492

Documentation 📓

• docs: Add migration note about unmapped mutable objects by @zzstoatzz in #19494

Full Changelog: https://github.com/PrefectHQ/prefect/compare/3.6.3…3.6.4

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3.6.3 - That’s JSON Bourne

Released on November 19, 2025

Enhancements ➕➕

• Add -o json output option to prefect flow-run ls command by @devin-ai-integration[bot] in #19484
• fix: allow pause_flow_run() to pause parent flow when called from task by @zzstoatzz in #19457

Bug Fixes 🐞

• Use acquisition service pattern for lease-based concurrency slots by @bunchesofdonald in #19451
• fix: respect subflow attributes (log_prints, result_storage) when running inside task by @zzstoatzz in #19450
• fix: defer forward reference resolution in ValidatedFunction by @zzstoatzz in #19452
• fix: validate deployment triggers after templating so jinja-based booleans work, should close #19348 by @iclectic in #19414
• fix: show detailed validation errors for top-level prefect.yaml fields by @zzstoatzz in #19468
• Clamp denied_slots decay rate to match retry-after calculation by @bunchesofdonald in #19466
• Fix: Enable parameter type checking for @task decorator by @zzstoatzz in #19459

Development & Tidiness 🧹

• add —build-arg to dev build-image command to allow direct passing of… by @conrade-ctc in #19473

Documentation 📓

• Add database cleanup example with human/AI approval by @zzstoatzz in #19456

Full Changelog: https://github.com/PrefectHQ/prefect/compare/3.6.2…3.6.3

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3.6.2 - The Missing Link

Released on November 13, 2025

Enhancements ➕

• Add causal link from automation action events to triggering events by @zzstoatzz in #19426

Bug Fixes 🐞

• cap retry-after for concurrency limits to prevent excessive delays by @zzstoatzz in #19428
• accept numeric values for PREFECT_API_SERVICES_LATE_RUNS_AFTER_SECONDS by @zzstoatzz in #19434
• add work_queue_id to DeploymentResponse by @zzstoatzz in #19417

Development & Tidiness 🧹

• correct GitHub Actions conditional syntax in integration release workflow by @zzstoatzz in #19439

Full Changelog: https://github.com/PrefectHQ/prefect/compare/3.6.1…3.6.2

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3.6.1 - Pop, Lock it, Docket

Released on November 10, 2025

Enhancements ➕

• Add logfire sampling configuration and fix boolean env var handling by @zzstoatzz in #19383

Bug Fixes 🐞

• Fix interactive deploy CLI selecting wrong flow when opting out by @zzstoatzz in #19392
• Fix deployment.parameters in nested flows using ContextVars by @zzstoatzz in #19366

Integrations & Dependencies 🤝

• Upgrade pydocket to stable 0.13.0 release by @zzstoatzz in #19401

Documentation 📓

• Add client methods for querying events via REST API by @zzstoatzz in #19382

Full Changelog: https://github.com/PrefectHQ/prefect/compare/3.6.0…3.6.1

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3.6.0 - Throw it on the docket and we’ll get to it in a jiffy

This release adds pydocket, a background task system, to replace FastAPI’s background_tasks. Background tasks now include automatic retries and can optionally use Redis as a backing layer for enhanced durable execution.

Released on November 07, 2025

Enhancements ➕➕

• Replace FastAPI background_task usage with pydocket by @desertaxle in #19377
• Emit events for deployment pull step execution by @zzstoatzz in #19339

Bug Fixes 🐞

• Fix import order dependency and circular import issues by @zzstoatzz in #19344
• Fix deployment.parameters in subprocess flows by @zzstoatzz in #19331
• Fix misleading pyright error when calling async task with wrong argument types by @zzstoatzz in #19327
• Fix EventsWorker singleton leak in prefect_test_harness by @zzstoatzz in #19343
• Fix run_deployment execution graph display when called from tasks by @desertaxle in #19361
• Fix automation deletion deadlock by enforcing consistent lock ordering by @zzstoatzz in #19369

Integrations & Dependencies 🤝

• Update prefect-ui-library to latest version by @znicholasbrown in #19350

Development & Tidiness 🧹

• Remove legacy settings imports from CLI by @desertaxle in #19353
• Clean up root directory by @zzstoatzz in #19355
• Replace Optional with pipe syntax in _trim_traceback function by @devin-ai-integration[bot] in #19358
• Auto-close superseded documentation PRs by @zzstoatzz in #19357
• Add @chrisguidry as a CODEOWNER by @desertaxle in #19368
• Sync UI v2 OpenAPI schema with node v20.19.0 by @zzstoatzz in #19373
• Migrate RedisStorageContainer from sync_compatible to async_dispatch by @devin-ai-integration[bot] in #19363

Documentation 📓

• Add Pulumi section to Infrastructure as Code documentation by @bdalpe in #19352
• Fix link in ECS worker docs by @mattiamatrix in #19364

Full Changelog: https://github.com/PrefectHQ/prefect/compare/3.5.0…3.6.0

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