PrefectHQ/prefect 3.4.24

3.4.24 - The Un-Crashening

on GitHub

Released on October 16, 2025

Enhancements ➕➕

• Add flow run watching with interleaved events and logs by @chrisguidry in #19158
• Use shared websocket utilities for Subscription SSL and proxy support by @chrisguidry in #19159
• Add --all flag to prefect automation delete by @zzstoatzz in #19164

Experimental 🧪

• Introduce experimental plugin system by @desertaxle in #19145

Bug Fixes 🐞

• Mitigate memory leak in in-memory messaging system by @desertaxle in #19136
• Fix duplicate env vars from work pools in Kubernetes jobs by @zzstoatzz in #19171
• Fix ProcessPoolTaskRunner when submitting with wait_for by @desertaxle in #19172
• Fix deployment name truncation in from_storage and afrom_storage by @zzstoatzz in #19179
• Avoid transitioning flow run to crashed when user code has already finished successfully by @desertaxle in #19181
• Fix worker crash from double-release of concurrency limiter token by @desertaxle in #19188
• Fix worker/runner crashes when flow runs are deleted by @desertaxle in #19189
• Fix race conditions in concurrency lease renewal by @bunchesofdonald in #19187
• Fix RunInput.with_initial_data to preserve type annotations by @zzstoatzz in #19176

Development & Tidiness 🧹

• Use canonical websocket_connect import in proxy test script by @zzstoatzz in #19161
• De-flake integration tests by @desertaxle in #19191
• Migrate prefect.states exception handlers to async_dispatch by @zzstoatzz in #19170
• Update downstream repo reference for image automation by @jamiezieziula in #19139

Documentation 📓

• Improve Prefect MCP server documentation by @zzstoatzz in #19142
• Clarify install instructions by @zzstoatzz in #19165
• Add documentation for passing event payloads to flows by @zzstoatzz in #19174
• Clarify build_docker_image accepts all Docker SDK kwargs by @zzstoatzz in #19194

Full Changelog: 3.4.23...3.4.24