Synapse 1.141.0rc1 (2025-10-21)

Deprecation of MacOS Python wheels

The team has decided to deprecate and eventually stop publishing python wheels for MacOS. This is a burden on the team, and we're not aware of any parties that use them. Synapse docker images will continue to work on MacOS, as will building Synapse from source (though note this requires a Rust compiler).

Publishing MacOS Python wheels will continue for the next few releases. If you do make use of these wheels downstream, please reach out to us in #synapse-dev:matrix.org. We'd love to hear from you!

Features

• Allow using MSC4190 behavior without the opt-in registration flag. Contributed by @tulir @ Beeper. (#19031)
• Stabilize support for MSC4326: Device masquerading for appservices. Contributed by @tulir @ Beeper. (#19033)

Bugfixes

• Fix a bug introduced in 1.136.0 that would prevent Synapse from being able to be reload-ed more than once when running under systemd. (#19060)
• Fix a bug introduced in 1.140.0 where an internal server error could be raised when hashing user passwords that are too long. (#19078)

Updates to the Docker image

• Update docker image to use Debian trixie as the base and thus Python 3.13. (#19064)

Internal Changes

• Move unique snowflake homeserver background tasks to start_background_tasks (the standard pattern for this kind of thing). (#19037)
• Drop a deprecated field of the PyGitHub dependency in the release script and raise the dependency's minimum version to 1.59.0. (#19039)
• Update TODO list of conflicting areas where we encounter metrics being clobbered (ApplicationService). (#19040)