3.7

3.7.0 - Our little features are all grown up 🥲

Released on May 06, 2026

New Features 🎉

• Graduate infrastructure decorators to GA by @desertaxle in #21784
• Promote plugin system from experimental to GA by @desertaxle in #21787
• Add isolated workspace resolver for flow run setup by @desertaxle in #21699

Enhancements ➕➕

• Support inline block placeholder substitution by @hemantmm in #21777
• Render Mermaid.js diagrams in Markdown blocks in ui-v2 by @devin-ai-integration[bot] in #21793
• Eliminate O(N²) checksum scan in read_block_schemas by @VittoriaLanzo in #21754
• Add per-browser UI version switcher by @desertaxle in #21706
• Add server default result storage config surface by @zzstoatzz in #21532
• Route server default result storage through runtime resolution by @zzstoatzz in #21759
• Add flow.generate_mermaid_graph() method for dependency-free flow visualization by @znicholasbrown in #21786
• Route flow-run execute through workspace resolver by @desertaxle in #21796
• Add flow engine module entrypoint by @desertaxle in #21799
• Run prepared pyproject workspaces with uv by @desertaxle in #21801
• Warn when nested ThreadPoolTaskRunner submission would deadlock by @devin-ai-integration[bot] in #21800
• Add cycle detection for block_document references by @Lougarou in #21829

Bug Fixes 🐞

• Use now() helper instead of DateTime.now() in deployment CLI by @devin-ai-integration[bot] in #21769
• Fix race condition in GitRepository.pull_code() with file-based locking by @devin-ai-integration[bot] in #21388
• Retry record_bulk_task_run_events on IntegrityError by @devin-ai-integration[bot] in #21813
• Set custom flow run names before Running events by @devin-ai-integration[bot] in #21803
• Prevent deadlock in mark_deployments_ready / mark_deployments_not_ready by @chuqCTC in #21792
• Fix V2 concurrency lease release errors by @devin-ai-integration[bot] in #21797

Development & Tidiness 🧹

• Avoid run_coro_as_sync deadlock in wait futures test by @devin-ai-integration[bot] in #21766
• Widen timing tolerance for test_flow_run_lateness_when_scheduled by @devin-ai-integration[bot] in #21781
• Widen flow timeout in test_timeout_concurrency_slot_released by @devin-ai-integration[bot] in #21788
• Add apt retry config to old-sqlite.Dockerfile by @devin-ai-integration[bot] in #21814
• Use thread-based pytest-timeout for test_timeout_stops_execution_at_next_task_for_sync_flows by @devin-ai-integration[bot] in #21819
• Add zombie flow detection trigger regression test by @devin-ai-integration[bot] in #21802

Full Changelog: https://github.com/PrefectHQ/prefect/compare/3.6.29...3.7.0

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