This release drops support for Python 3.9, in line with our [dependency deprecation policy](https://element-hq.github.io/synapse/latest/deprecation_policy.html#platform-dependencies), as it is now [end of life](https://endoflife.date/python). 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). At present, publishing MacOS Python wheels will continue for the next release (1.143.0), but will not be available after that (1.144.0+). If you do make use of these wheels downstream, please reach out to us in [#synapse-dev:matrix.org](https://matrix.to/#/#synapse-dev:matrix.org). We'd love to hear from you! - Add support for Python 3.14. ([\#19055](https://github.com/element-hq/synapse/issues/19055), [\#19134](https://github.com/element-hq/synapse/issues/19134)) - Add an [Admin API](https://element-hq.github.io/synapse/latest/usage/administration/admin_api/index.html) to allow an admin to fetch the space/room hierarchy for a given space. ([\#19021](https://github.com/element-hq/synapse/issues/19021)) - Fix a bug introduced in 1.111.0 where failed attempts to download authenticated remote media would not be handled correctly. ([\#19062](https://github.com/element-hq/synapse/issues/19062)) - Update the `oidc_session_no_samesite` cookie to have the `Secure` attribute, so the only difference between it and the paired `oidc_session` cookie, is the configuration of the `SameSite` attribute as described in the comments / cookie names. Contributed by @kieranlane. ([\#19079](https://github.com/element-hq/synapse/issues/19079)) - Fix a bug introduced in 1.140.0 where lost logcontext warnings would be emitted from timeouts in sync and requests made by Synapse itself. ([\#19090](https://github.com/element-hq/synapse/issues/19090)) - Fix a bug introdued in 1.140.0 where lost logcontext warning were emitted when using `HomeServer.shutdown()`. ([\#19108](https://github.com/element-hq/synapse/issues/19108)) - Update the link to the Debian oldstable package for SQLite. ([\#19047](https://github.com/element-hq/synapse/issues/19047)) - Point out additional Redis configuration options available in the worker docs. Contributed by @servisbryce. ([\#19073](https://github.com/element-hq/synapse/issues/19073)) - Update the list of Debian releases that the downstream Debian package is maintained for. ([\#19100](https://github.com/element-hq/synapse/issues/19100)) - Add [a page](https://element-hq.github.io/synapse/latest/development/internal_documentation/release_notes_review_checklist.html) to the documentation describing the steps the Synapse team takes to review the release notes before publishing them. ([\#19109](https://github.com/element-hq/synapse/issues/19109)) - Drop support for Python 3.9. ([\#19099](https://github.com/element-hq/synapse/issues/19099)) - Remove support for SQLite < 3.37.2. ([\#19047](https://github.com/element-hq/synapse/issues/19047)) - Fix CI linter for schema delta files to correctly handle all types of `CREATE TABLE` syntax. ([\#19020](https://github.com/element-hq/synapse/issues/19020)) - Use type hinting generics in standard collections, as per [PEP 585](https://peps.python.org/pep-0585/), added in Python 3.9. ([\#19046](https://github.com/element-hq/synapse/issues/19046)) - Always treat `RETURNING` as supported by SQL engines, now that the minimum-supported versions of both SQLite and PostgreSQL support it. ([\#19047](https://github.com/element-hq/synapse/issues/19047)) - Move `oidc.load_metadata()` startup into `_base.start()`. ([\#19056](https://github.com/element-hq/synapse/issues/19056)) - Remove logcontext problems caused by awaiting raw `deferLater(...)`. ([\#19058](https://github.com/element-hq/synapse/issues/19058)) - Prevent duplicate logging setup when running multiple Synapse instances. ([\#19067](https://github.com/element-hq/synapse/issues/19067)) - Be mindful of other logging context filters in 3rd-party code and avoid overwriting log record fields unless we know the log record is relevant to Synapse. ([\#19068](https://github.com/element-hq/synapse/issues/19068)) - Update pydantic to v2. ([\#19071](https://github.com/element-hq/synapse/issues/19071)) - Update deprecated code in the release script to prevent a warning message from being printed. ([\#19080](https://github.com/element-hq/synapse/issues/19080)) - Update the deprecated poetry development dependencies group name in `pyproject.toml`. ([\#19081](https://github.com/element-hq/synapse/issues/19081)) - Remove `pp38*` skip selector from cibuildwheel to silence warning. ([\#19085](https://github.com/element-hq/synapse/issues/19085)) - Don't immediately exit the release script if the checkout is dirty. Instead, allow the user to clear the dirty changes and retry. ([\#19088](https://github.com/element-hq/synapse/issues/19088)) - Update the release script's generated announcement text to include a title and extra text for RC's. ([\#19089](https://github.com/element-hq/synapse/issues/19089)) - Fix lints on main branch. ([\#19092](https://github.com/element-hq/synapse/issues/19092)) - Use cheaper random string function in logcontext utilities. ([\#19094](https://github.com/element-hq/synapse/issues/19094)) - Avoid clobbering other `SIGHUP` handlers in 3rd-party code. ([\#19095](https://github.com/element-hq/synapse/issues/19095)) - Prevent duplicate GitHub draft releases being created during the Synapse release process. ([\#19096](https://github.com/element-hq/synapse/issues/19096)) - Use Pillow's `Image.getexif` method instead of the experimental `Image._getexif`. ([\#19098](https://github.com/element-hq/synapse/issues/19098)) - Prevent uv `/usr/local/.lock` file from appearing in built Synapse docker images. ([\#19107](https://github.com/element-hq/synapse/issues/19107)) - Allow Synapse's runtime dependency checking code to take packaging markers (i.e. `python <= 3.14`) into account when checking dependencies. ([\#19110](https://github.com/element-hq/synapse/issues/19110)) - Move exception handling up the stack (avoid `exit(1)` in our composable functions). ([\#19116](https://github.com/element-hq/synapse/issues/19116)) - Fix a lint error related to lifetimes in Rust 1.90. ([\#19118](https://github.com/element-hq/synapse/issues/19118)) - Refactor and align app entrypoints (avoid `exit(1)` in our composable functions). ([\#19121](https://github.com/element-hq/synapse/issues/19121), [\#19131](https://github.com/element-hq/synapse/issues/19131)) - Speed up pruning of ratelimiters. ([\#19129](https://github.com/element-hq/synapse/issues/19129)) * Bump actions/download-artifact from 5.0.0 to 6.0.0. ([\#19102](https://github.com/element-hq/synapse/issues/19102)) * Bump actions/upload-artifact from 4 to 5. ([\#19106](https://github.com/element-hq/synapse/issues/19106)) * Bump hiredis from 3.2.1 to 3.3.0. ([\#19103](https://github.com/element-hq/synapse/issues/19103)) * Bump icu_segmenter from 2.0.0 to 2.0.1. ([\#19126](https://github.com/element-hq/synapse/issues/19126)) * Bump idna from 3.10 to 3.11. ([\#19053](https://github.com/element-hq/synapse/issues/19053)) * Bump ijson from 3.4.0 to 3.4.0.post0. ([\#19051](https://github.com/element-hq/synapse/issues/19051)) * Bump markdown-it-py from 3.0.0 to 4.0.0. ([\#19123](https://github.com/element-hq/synapse/issues/19123)) * Bump msgpack from 1.1.1 to 1.1.2. ([\#19050](https://github.com/element-hq/synapse/issues/19050)) * Bump psycopg2 from 2.9.10 to 2.9.11. ([\#19125](https://github.com/element-hq/synapse/issues/19125)) * Bump pyyaml from 6.0.2 to 6.0.3. ([\#19105](https://github.com/element-hq/synapse/issues/19105)) * Bump regex from 1.11.3 to 1.12.2. ([\#19074](https://github.com/element-hq/synapse/issues/19074)) * Bump reqwest from 0.12.23 to 0.12.24. ([\#19077](https://github.com/element-hq/synapse/issues/19077)) * Bump ruff from 0.12.10 to 0.14.3. ([\#19124](https://github.com/element-hq/synapse/issues/19124)) * Bump sigstore/cosign-installer from 3.10.0 to 4.0.0. ([\#19075](https://github.com/element-hq/synapse/issues/19075)) * Bump stefanzweifel/git-auto-commit-action from 6.0.1 to 7.0.0. ([\#19052](https://github.com/element-hq/synapse/issues/19052)) * Bump tokio from 1.47.1 to 1.48.0. ([\#19076](https://github.com/element-hq/synapse/issues/19076)) * Bump types-psycopg2 from 2.9.21.20250915 to 2.9.21.20251012. ([\#19054](https://github.com/element-hq/synapse/issues/19054))