# Prefect Changelog New in Prefect: features, improvements, and fixes across open source and Prefect Cloud. Web version: https://www.prefect.io/changelog RSS: https://www.prefect.io/changelog/feed.xml ## Prefect 3.8: the redesigned UI ships by default 2026-07-23 · version 3.8.0 · "You had me at first paint" · open-source Permalink: https://www.prefect.io/changelog/prefect-3-8 The redesigned UI is now the default for self-hosted servers, with quicker run navigation, clickable log links, and a round of reliability fixes. **The redesigned UI is the default for self-hosted servers.** Run Prefect yourself and you now get the V2 interface out of the box, with no opt-in required. ([#22519](https://github.com/PrefectHQ/prefect/pull/22519)) Also in this release: - Added: **Copy to new run.** Re-run a flow straight from the run menu with its options carried over. (#22565, #22567) - Added: **Clickable log links.** URLs in run logs are now links you can follow. (#22496) - Added: **Easier date inputs.** Pick a year and month, or type a date directly, when filtering runs. (#22495) - Added: **Deployment filters on triggers.** Flow run triggers can scope to specific deployments. (#22319) - Fixed: **Run watch survives reconnects.** Following a flow run keeps going across stream disconnects. (#22550) - Fixed: **No leaked concurrency slots.** A cancelled slot acquisition no longer leaves a slot reserved. (#22542) The [full release notes](https://docs.prefect.io/v3/release-notes/oss/version-3-8) cover every change, including bug fixes. --- ## Workspace search and a command palette in Prefect Cloud 2026-07-14 · cloud Permalink: https://www.prefect.io/changelog/cloud-workspace-search Find any object in your workspace by ID or search term, view and filter results on a dedicated page, and jump to any page or run common actions from a command palette. Find relevant objects in your workspace by ID or a regular search term, view and filter results on a dedicated page, and navigate directly to any page in the application. A command palette runs common actions without leaving the keyboard, including: - Running a flow - Toggling an automation - Creating an API key ...and many more. --- ## Prefect 3.7.8: scheduling and event stream fixes 2026-07-09 · version 3.7.8 · "The flush must go on" · open-source Permalink: https://www.prefect.io/changelog/prefect-3-7-8 A patch release focused on reliability at the edges: RRULE schedule anchors, the event recorder under load, and clearer worker auth errors. - Fixed: **Recurring schedules stay put.** `RRULE` anchors were computed in UTC but interpreted as local time, which could shift recurring runs by your UTC offset. (#22456) - Fixed: **Event recording survives bursts.** `TaskRunRecorder` keeps its periodic flush alive when events are dropped, so a burst no longer stalls recording. (#22441) - Fixed: **The events client picks up where it left off.** When its connection drops, it reconnects from a time-based checkpoint instead of losing its place in the stream. (#22451) - Changed: **Clearer worker auth errors.** Channel upgrade failures now distinguish HTTP 401 from 403, so you can tell a bad credential from a missing permission. (#22469) - Changed: **Readable concurrency errors.** Server-side validation errors for concurrency slot acquisition are now formatted instead of raw. (#22470) - Fixed: **A Windows fix.** `git pull` in runner storage no longer hits a permission error. (#22447) Upgrade with `pip install -U prefect`, or see the [full release notes](https://docs.prefect.io/v3/release-notes/oss/version-3-7) for everything in 3.7. --- ## Prefect 3.7.1 through 3.7.7: real-time workers and a faster scheduler 2026-07-02 · open-source Permalink: https://www.prefect.io/changelog/prefect-3-7-series The releases between 3.7.0 and 3.7.8 built a real-time channel between the server and workers, made the scheduler noticeably faster, and started emitting lifecycle events for every object. - Added: **A real-time worker channel.** Workers hold a WebSocket connection to the server, with a REST fallback, so work-pool changes and cancellations reach them without waiting on a poll. (#21859, #21885, #22004) - Added: **Reliable cancellation cleanup.** A Redis-backed cleanup queue with leases, retries, and dead-letter handling makes sure a cancelled run's infrastructure actually gets torn down. (#22109, #22205, #22206) - Added: **Lifecycle events for everything.** Prefect emits created, updated, and deleted events for variables, flows, blocks, concurrency limits, artifacts, and automations, so you can automate on any change. (#22226) - Added: **Delete a flow run from an automation.** A new automation action removes flow runs, so you can prune on your own rules. (#22018) - Changed: **A faster scheduler and quicker startup.** A partial index speeds up scheduling queries, and lazy server imports cut cold-start time. (#22111, #22122) - Added: **Default result storage from the CLI.** Set a workspace's default result storage without writing code. (#21771) The [release notes](https://docs.prefect.io/v3/release-notes/oss) cover every 3.7 release in full. --- ## Launch Week: dbt orchestration and infrastructure debugging in Cloud 2026-05-14 · cloud Permalink: https://www.prefect.io/changelog/cloud-launch-week-2026 Prefect Cloud's spring launch week brought first-class dbt orchestration, infrastructure debugging in the run page, managed automations, config plugins, and per-workspace rate limits. - Added: **Prefect dbt orchestrator.** Run dbt projects with state-aware caching that skips work already fresh, plus per-model retries and concurrency management. - Added: **Infrastructure debugging in the run page.** See memory pressure, pod logs, and eviction details for a run without leaving Prefect. - Added: **Managed automations.** Streamlined automation management for enterprise workflows. - Added: **Config plugins.** A plugin system for customizing deployment configuration. - Added: **Per-workspace rate limits.** Set API rate-limit controls at the workspace level. Read the full story on the [launch page](https://www.prefect.io/launch). --- ## Prefect 3.7: infrastructure decorators and plugins are GA 2026-05-06 · version 3.7.0 · "Our little features are all grown up" · open-source Permalink: https://www.prefect.io/changelog/prefect-3-7 Two of our most-requested experimental surfaces graduate to general availability, flows can render their own dependency graphs, and prepared workspaces now run with uv. **Infrastructure decorators are generally available.** Declare where a flow runs next to the flow itself, no separate deployment configuration required. ([#21784](https://github.com/PrefectHQ/prefect/pull/21784)) **The plugin system is generally available.** Extend Prefect with your own integrations using the same mechanism our official ones use. ([#21787](https://github.com/PrefectHQ/prefect/pull/21787)) Also in this release: - Added: **Flows can draw themselves.** `flow.generate_mermaid_graph()` renders a flow's dependency graph with no extra dependencies, and the UI now renders Mermaid diagrams inside Markdown blocks. (#21786, #21793) - Added: **Set result storage once.** Servers can define default result storage, resolved at runtime, so individual flows no longer need to repeat it. (#21532) - Changed: **Faster, reproducible environments.** Prepared `pyproject` workspaces run with `uv`. (#21801) - Changed: **Smaller touches.** A per-browser UI version switcher, block schema reads without the O(N²) checksum scan, and a warning when nested `ThreadPoolTaskRunner` submissions would deadlock. The [full release notes](https://docs.prefect.io/v3/release-notes/oss/version-3-7) cover every change, including bug fixes. --- ## Prefect 3.6.10 through 3.6.29: the command line grows up 2026-05-01 · open-source Permalink: https://www.prefect.io/changelog/prefect-3-6-series The releases across early 2026 leaned into the command line and day-to-day operations: SDK generation, a server status command, watching runs from the terminal, and richer run telemetry. - Added: **Generate a deployment SDK.** `prefect sdk generate` builds a typed client for an existing deployment, so callers get autocomplete and validation. (#20150) - Added: **A server status command.** `prefect server status` checks a self-hosted server's health from the command line. (#20619) - Added: **Watch a run from the terminal.** `prefect flow-run watch` follows any flow run until it reaches a terminal state. (#21260) - Added: **Carry run context into subprocesses.** `with_context()` propagates Prefect's run context into processes you spawn yourself. (#21304) - Added: **Manage assets from the CLI.** `prefect cloud asset` lists and deletes assets. (#20524) - Added: **Bulk operations.** New endpoints act on many flow runs, deployments, and flows at once. (#20469) - Added: **Clearer pre-run states.** Workers emit `Submitting` and `InfrastructurePending`, so you can watch a run come up. (#20964) - Added: **Run resource telemetry.** Flow run subprocesses report OS-level resource use. (#21071) The [release notes](https://docs.prefect.io/v3/release-notes/oss) cover every 3.6 release in full. --- ## Assets: track what your workflows produce 2025-06-12 · open-source, cloud Permalink: https://www.prefect.io/changelog/assets-from-task-to-materialize Replace @task with @materialize and Prefect tracks the tables, models, and files your workflows produce, and how they all connect. When a dashboard throws garbage numbers at quarter-end, someone has to follow the breadcrumbs back through tasks, tables, and stray CSVs. That is asset lineage in the real world, and Prefect now tracks it without asking you to contort your workflow around asset definitions. Tell Prefect what a function produces: ```python title="assets.py" @materialize("s3://bucket/important-data.csv") def write_data(): # writes s3://bucket/important-data.csv ... ``` Prefect builds the lineage graph from there: what each workflow produces, when it last ran, and how your outputs depend on each other. Read the [announcement post](/blog/introducing-assets-from-task-to-materialize) for the full story, or start with the [assets documentation](https://docs.prefect.io/v3/concepts/assets).