What PrefectHQ/prefect shipped

Prefect 3.9.2 shipped this week. Deployment polling writes only what changed, lock release tolerates expired locks, and heartbeats stop before a terminal state proposal. Also: $ref flow parameter schemas and sparse checkout directory changes now work.

Prefect 3.9.2 is out this week. Queue polling now writes deployments only when a poll actually changes them, keeping poll freshness without extra writes. MemoryLockManager and FileSystemLockManager release expired or already-released locks as a no-op, and flow run heartbeats stop before the engine proposes a terminal state. Other fixes: held-event sweeps skip locked rows, $ref values in flow parameter schemas are preserved, git pull_code applies directory changes to an existing sparse checkout, and flow state hooks receive arguments the same way in the engine and the runner.

This week: task cache keys no longer collide across different tasks, DataFrame column order is preserved in INPUTS cache keys, and failed task states are no longer cached as successful. Also: Docker volume preservation on direct flow submissions, Kubernetes worker retry on API-ke

This week's work on Prefect focused on correctness. Task caching fixes stop different tasks from sharing a cache key, preserve DataFrame column order in INPUTS cache keys, and prevent failed task states from being stored as successful results. Deployment submissions to Docker work pools now keep configured volumes when no bundle storage is used, and Kubernetes workers retry when another submission creates the shared API-key Secret first. Task runs can be sorted by duration on the server, filter_files no longer aborts on a directory symlink cycle, and deployment concurrency leases are preserved on forced state changes.

Prefect 3.9.0 is out: Python 3.10 support dropped, deprecated runner execution paths removed, Pendulum datetime behavior deprecated on 3.11-3.12. Nightly builds also add custom state discovery and filters, and flows that return a failed state now retry when retries are set.

Prefect 3.9.0 is released, dropping Python 3.10 support, removing deprecated runner execution paths, and deprecating Pendulum datetime behavior on Python 3.11 and 3.12. The 2.x line also got 2.20.27, which allows patched AnyIO releases and refreshes pip and Conda CA trust in the Prefect 2 images. Nightly builds added custom state discovery and filters, including separate state type and name filters for custom states, and made flows that return a failed state retry when retries are configured. Other fixes cover shallow clone updates and CloudWatch log group permissions for provisioned ECS roles.

This week: S3 bucket prefixes now survive paths with leading slashes, prefect deploy keeps list items templated from step outputs, negative timeouts in pause and suspend are rejected up front, and integration tests now cover Python 3.14.

This week in Prefect: S3 bucket folder prefixes are preserved when read or write paths start with a leading slash, prefect deploy no longer drops list items templated from build or push step outputs, and pause_flow_run, suspend_flow_run and their async versions now raise a ValueError right away for negative timeouts instead of failing later. Bundled collection metadata got working logo URLs, the ECS manual-deployment guide imports WorkPoolUpdate from the correct module, and integration packages have updated classifiers with Python 3.14 added to their test matrix. These fixes are collected in nightly development release 3.8.9.dev6.

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.

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.

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.

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.