chore(deps): update matrixdotorg/synapse docker tag to v1.153.0

[renovate]

This PR contains the following updates:

Package	Update	Change
matrixdotorg/synapse	minor	v1.152.1 → v1.153.0

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Release Notes

element-hq/synapse (matrixdotorg/synapse)

v1.153.0

Compare Source

Synapse 1.153.0 (2026-05-19)

No significant changes since 1.153.0rc3.

Synapse 1.153.0rc3 (2026-05-15)

Bugfixes

• Revert 'Have MSC4186: Simplified Sliding Sync return a new response immediately if a room subscription has changed and produced a new response. (#​19714)' (introduced in 1.153.0rc1) due to performance problems. (#​19784)

Synapse 1.153.0rc2 (2026-05-13)

Bugfixes

• Correctly handle arbitrary precision integers in unsigned field of events. The bug was introduced in 1.153.0rc1. (#​19769)

Synapse 1.153.0rc1 (2026-05-08)

Features

• Make ACLs apply to EDUs per MSC4163. (#​18475)
• Stabilize MSC3266: Room summary API, removing the experimental config flag msc3266_enabled. Contributed by @​dasha-uwu. (#​19720)
• Partial MSC4311 implementation: m.room.create is now a required part of stripped invite_state/knock_state . Contributed by @​FrenchGithubUser @​Famedly. (#​19722)
• Expose tombstoned and replacement_room in room details on admin API endpoint GET /_synapse/admin/v1/rooms/<room_id>. Contributed by Noah Markert. (#​19737)

Bugfixes

• Allow self-requested user erasure (upon account deactivation) to succeed even if Synapse has disabled profile changes. Contributed by Famedly. (#​19398)
• Fix Synapse not backfilling new history when attempting to use a pagination token near a backward extremity. (#​19611)
• Have MSC4186: Simplified Sliding Sync return a new response immediately if a room subscription has changed and produced a new response. (#​19714)
• Fix a bug where when upgrading a room to room version 12, the power level event in the old room got temporarily mutated to remove the user upgrading the room's power. (#​19727)
• Fix packaging for Fedora and EPEL caused by unnecessary bumping authlib minimum version requirement in pyproject.toml file. Contributed by Oleg Girko. (#​19742)

Improved Documentation

• Add warning about known problems when configuring use_frozen_dicts. (#​19711)

Internal Changes

• Port Event.signatures field to Rust. (#​19706)
• Port Event.unsigned field to Rust. (#​19708)
• Add a Rust canonical JSON serializer. (#​19739, #​19763)
• Configure Dependabot to only update Python dependencies in the lockfile, unless widening upper bounds. (#​19743)
• Reduce WORKER_LOCK_MAX_RETRY_INTERVAL to 5 seconds to reduce idle time after lock is released. (#​19755)
• Force keyword-only arguments for Duration so time units have to be specified. (#​19756)

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