Synapse 1.144.0rc1 (2025-12-02)

Admins using the unstable MSC2666 endpoint (/_matrix/client/unstable/uk.half-shot.msc2666/user/mutual_rooms), please check the relevant section in the upgrade notes as this release contains changes that disable that endpoint by default.

Features

• Add experimentatal implememntation of MSC4380 (invite blocking). (#19203)
• Allow restarting delayed event timeouts on workers. (#19207)

Bugfixes

• Fix a bug in the database function for fetching state deltas that could result in unnecessarily long query times. (#18960)
• Fix v12 rooms when running with use_frozen_dicts: True. (#19235)
• Fix bug where invalid canonical_alias content would return 500 instead of 400. (#19240)
• Fix bug where Duration was logged incorrectly. (#19267)

Improved Documentation

• Document in the --config-path help how multiple files are merged - by merging them shallowly. (#19243)

Deprecations and Removals

• Stop building release wheels for MacOS. (#19225)

Internal Changes

• Improve event filtering for Simplified Sliding Sync. (#17782)
• Export SYNAPSE_SUPPORTED_COMPLEMENT_TEST_PACKAGES environment variable from scripts-dev/complement.sh. (#19208)
• Refactor scripts-dev/complement.sh logic to avoid exit to facilitate being able to source it from other scripts (composable). (#19209)
• Expire sliding sync connections that are too old or have too much pending data. (#19211)
• Require an experimental feature flag to be enabled in order for the unstable MSC2666 endpoint (/_matrix/client/unstable/uk.half-shot.msc2666/user/mutual_rooms) to be available. (#19219)
• Prevent changelog check CI running on @dependabot's PRs even when a human has modified the branch. (#19220)
• Auto-fix trailing spaces in multi-line strings and comments when running the lint script. (#19221)
• Move towards using a dedicated Duration type. (#19223, #19229)
• Improve robustness of the SQL schema linting in CI. (#19224)
• Add log to determine whether clients are using /messages as expected. (#19226)
• Simplify README and add ESS Getting started section. (#19228, #19259)
• Add a unit test for ensuring associated refresh tokens are erased when a device is deleted. (#19230)
• Prompt user to consider adding future deprecations to the changelog in release script. (#19239)
• Fix check of the Rust compiled code being outdated when using source checkout and .egg-info. (#19251)
• Stop building macos wheels in CI pipeline. (#19263)

Updates to locked dependencies

• Bump Swatinem/rust-cache from 2.8.1 to 2.8.2. (#19244)
• Bump actions/checkout from 5.0.0 to 6.0.0. (#19213)
• Bump actions/setup-go from 6.0.0 to 6.1.0. (#19214)
• Bump actions/setup-python from 6.0.0 to 6.1.0. (#19245)
• Bump attrs from 25.3.0 to 25.4.0. (#19215)
• Bump docker/metadata-action from 5.9.0 to 5.10.0. (#19246)
• Bump http from 1.3.1 to 1.4.0. (#19249)
• Bump pydantic from 2.12.4 to 2.12.5. (#19250)
• Bump pyopenssl from 25.1.0 to 25.3.0. (#19248)
• Bump rpds-py from 0.28.0 to 0.29.0. (#19216)
• Bump rpds-py from 0.29.0 to 0.30.0. (#19247)
• Bump sentry-sdk from 2.44.0 to 2.46.0. (#19218)
• Bump types-bleach from 6.2.0.20250809 to 6.3.0.20251115. (#19217)
• Bump types-jsonschema from 4.25.1.20250822 to 4.25.1.20251009. (#19252)