Celery v5.6.0 Beta 1 is now available for testing. Please help us test this version and report any issues.

What's Changed

• docs: mention of json serializer recursive reference message size blowup (#5000) by @chrisbarber in https://github.com/celery/celery/pull/9743
• docs: typo in canvas.rst by @chrisbarber in https://github.com/celery/celery/pull/9744
• Makes _on_retry return a float as required to be used as errback on retry_over_time by @maccinza in https://github.com/celery/celery/pull/9741
• Update canvas.rst doc calculation order for callback by @auvipy in https://github.com/celery/celery/pull/9758
• Updated Blacksmith logo by @Nusnus in https://github.com/celery/celery/pull/9763
• Made the Sponsors logos link to their website by @Nusnus in https://github.com/celery/celery/pull/9764
• add missing cloudamqp logo by @auvipy in https://github.com/celery/celery/pull/9767
• Improve sponsor visibility by @auvipy in https://github.com/celery/celery/pull/9768
• fix: (#9773) task_id must not be empty with chain as body of a chord by @dfm88 in https://github.com/celery/celery/pull/9774
• Update setup.py to fix deprecation warning by @auvipy in https://github.com/celery/celery/pull/9771
• Adds integration test for chord_unlock bug when routed to quorum/topic queue by @maccinza in https://github.com/celery/celery/pull/9766
• Add xfail test for default queue/exchange fallback ignoring task_default_* settings by @maccinza in https://github.com/celery/celery/pull/9765
• Add xfail test for RabbitMQ quorum queue global QoS race condition by @maccinza in https://github.com/celery/celery/pull/9770
• fix: (#8786) time out when chord header fails with group body by @dfm88 in https://github.com/celery/celery/pull/9788
• Fix #9738 : Add root_id and parent_id to .apply() by @dfm88 in https://github.com/celery/celery/pull/9784
• Replace DelayedDelivery connection creation to use context manger by @bityob in https://github.com/celery/celery/pull/9793
• Fix #9794: Pydantic integration fails with future.annotations. by @davidt in https://github.com/celery/celery/pull/9795
• add go and rust implementation in docs by @darixsamani in https://github.com/celery/celery/pull/9800
• Fix memory leak in exception handling (Issue #8882) by @jaiganeshs21 in https://github.com/celery/celery/pull/9799
• Fix handlers docs (Issue #9787) by @jaiganeshs21 in https://github.com/celery/celery/pull/9804
• Remove importlib_metadata leftovers by @cjwatson in https://github.com/celery/celery/pull/9791
• Update timeout minutes for smoke tests CI by @auvipy in https://github.com/celery/celery/pull/9807
• Revert "Remove dependency on pycurl" by @auvipy in https://github.com/celery/celery/pull/9620
• Add Blacksmith Docker layer caching to all Docker builds by @Nusnus in https://github.com/celery/celery/pull/9840
• Bump Kombu to v5.6.0b1 by @Nusnus in https://github.com/celery/celery/pull/9839
• Disable pytest-xdist for smoke tests and increase retries (CI ONLY) by @Nusnus in https://github.com/celery/celery/pull/9842
• Fix Python 3.13 compatibility in events dumper by @Nusnus in https://github.com/celery/celery/pull/9826
• Dockerfile Build Optimizations by @Nusnus in https://github.com/celery/celery/pull/9733
• Migrated from useblacksmith/build-push-action@v1 to useblacksmith/setup-docker-builder@v1 in the CI by @Nusnus in https://github.com/celery/celery/pull/9846
• Remove incorrect example by @YuppY in https://github.com/celery/celery/pull/9854
• Revert "Use Django DB max age connection setting" by @danlamanna in https://github.com/celery/celery/pull/9824
• Fix pending_result memory leak by @tsoos99dev in https://github.com/celery/celery/pull/9806
• Update python-package.yml by @auvipy in https://github.com/celery/celery/pull/9856
• Bump actions/checkout from 4 to 5 by @dependabot[bot] in https://github.com/celery/celery/pull/9857
• Bump Kombu to v5.6.0b2 by @Nusnus in https://github.com/celery/celery/pull/9858
• Refactor integration and smoke tests CI by @Nusnus in https://github.com/celery/celery/pull/9855
• Fix AsyncResult.forget() with couchdb backend method raises TypeError: a bytes-like object is required, not 'str' by @temaxuck in https://github.com/celery/celery/pull/9865
• Improve Docs for SQS Authentication by @BlaiseMuhirwa in https://github.com/celery/celery/pull/9868
• Added .github/copilot-instructions.md for GitHub Copilot by @Nusnus in https://github.com/celery/celery/pull/9874
• misc: credit removal by @0asys in https://github.com/celery/celery/pull/9877
• Choose queue type and exchange type when creating missing queues (fix #9671) by @ghirailghiro in https://github.com/celery/celery/pull/9815
• fix: prevent celery from hanging due to spawned greenlet errors in greenlet drainers by @linusphan in https://github.com/celery/celery/pull/9371
• Feature/disable prefetch fixes by @Dkhodos in https://github.com/celery/celery/pull/9863
• Add worker_eta_task_limit configuration to manage ETA task memory usage by @sashu2310 in https://github.com/celery/celery/pull/9853
• Update runner version in Docker workflow by @auvipy in https://github.com/celery/celery/pull/9884
• Prepare for (pre) release: v5.6.0b1 by @Nusnus in https://github.com/celery/celery/pull/9890

New Contributors

• @chrisbarber made their first contribution in https://github.com/celery/celery/pull/9743
• @dfm88 made their first contribution in https://github.com/celery/celery/pull/9774
• @davidt made their first contribution in https://github.com/celery/celery/pull/9795
• @darixsamani made their first contribution in https://github.com/celery/celery/pull/9800
• @YuppY made their first contribution in https://github.com/celery/celery/pull/9854
• @danlamanna made their first contribution in https://github.com/celery/celery/pull/9824
• @tsoos99dev made their first contribution in https://github.com/celery/celery/pull/9806
• @temaxuck made their first contribution in https://github.com/celery/celery/pull/9865
• @BlaiseMuhirwa made their first contribution in https://github.com/celery/celery/pull/9868
• @ghirailghiro made their first contribution in https://github.com/celery/celery/pull/9815
• @linusphan made their first contribution in https://github.com/celery/celery/pull/9371
• @Dkhodos made their first contribution in https://github.com/celery/celery/pull/9863
• @sashu2310 made their first contribution in https://github.com/celery/celery/pull/9853

Full Changelog: https://github.com/celery/celery/compare/v5.5.3...v5.6.0b1