Data and AI releases

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prefect 3.6.3 - That's JSON Bourne

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Enhancements ➕➕ - Add -o json output option to prefect flow-run ls command - fix: allow pause_flow_run() to pause parent flow when called from task Bug Fixes 🐞 - Use acquisition service pattern for lease-based concurrency slots - fix: respect subflow attributes (log_prints, result_storage) when running inside task - fix: defer forward reference resolution...

Developer tools

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Also shipped Nov 19, 2025Prefect in November 2025 →

Fast Mode

Fast Mode is a new feature for Replit Agent that allows users to perform quick, precise adjustments to their applications.

GA
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Metrics in Open Beta for JS and Python

Send counters, gauges, and distributions from your code to track things like email.sent, checkout.failed, queue.depth etc , and pivot directly into the related traces, logs, and errors when something looks off.

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Prefect 3.6.4 - No Deployment Left Unparametrized

Bug Fixes 🐞 - fix: preserve event template parameters in deployment triggers - Fix truncating log behavior Integrations & Dependencies 🤝 - Chore: Bump ui library Documentation 📓 - docs: Add migration note about unmapped mutable objects

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Prefect 3.6.2 - The Missing Link

Enhancements ➕ - Add causal link from automation action events to triggering events Bug Fixes 🐞 - cap retry-after for concurrency limits to prevent excessive delays - accept numeric values for PREFECT_API_SERVICES_LATE_RUNS_AFTER_SECONDS - add work_queue_id to DeploymentResponse Development & Tidiness 🧹 - correct GitHub Actions conditional syntax in...

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Prefect 3.6.1 - Pop, Lock it, Docket

Enhancements ➕ - Add client methods for querying events via REST API Bug Fixes 🐞 - Fix interactive deploy CLI selecting wrong flow when opting out - Fix deployment.parameters in nested flows using ContextVars - Add logfire sampling configuration and fix boolean env var handling Integrations & Dependencies 🤝 - Upgrade pydocket to stable 0.13.0 release

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Prefect 3.6.0

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.

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Prefect 3.6.5 - Batch Me If You Can

3.6.5 - Batch Me If You Can Released on December 04, 2025 Enhancements ➕➕ Raise if event is too big Support Path objects in result_storage parameter Hide "Join the Community" in air-gapped deployments Parametrize xreadgroup batch size in consumer and add EventPersister service setting Parametrize xautoclaim batch size Parametrize TaskRunRecorder and Trigger...

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Prefect 2.20.25 - Latest and Greatest

Bug Fixes 🐞 - fix: update 2-latest Docker tag on all 2.x releases Integrations & Dependencies 🤝 - chore(deps): update asyncpg requirement from =0.23 to >=0.23,<0.32.0

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Prefect 3.5.0 - 🎃 The Exorcism of Python 3.9 👻

Released on October 31, 2025 With the removal of Python 3.9 support, Prefect now requires Python 3.10 or later. This means you can finally say goodbye to from __future__ import annotations in your workflow code, native type annotations are now standard!

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