Update docker.io/matrixdotorg/synapse Docker tag to v1.151.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker.io/matrixdotorg/synapse	final	minor	v1.149.1 → v1.151.0

---

Release Notes

element-hq/synapse (docker.io/matrixdotorg/synapse)

v1.151.0

Compare Source

Synapse 1.151.0 (2026-04-07)

Bugfixes

• Fix KNOWN_ROOM_VERSIONS.__contains__ raising TypeError for non-string keys, which could cause /sync to fail for rooms with a NULL room version in the database. Bug introduced in #​19589 as part of v1.151.0rc1. (#​19649)

Synapse 1.151.0rc1 (2026-03-31)

Features

• Add stable support for MSC4284 Policy Servers. (#​19503)
• Update and stabilize support for MSC2666: Get rooms in common with another user. Contributed by @​tulir @​ Beeper. (#​19511)
• Updated experimental support for MSC4388: Secure out-of-band channel for sign in with QR. (#​19573)
• Stabilize room_version and encryption fields in the space/room /hierarchy API (part of MSC3266). (#​19576)
• Introduce a configuration option to allow using HTTP/2 over plaintext when Synapse connects to Matrix Authentication Service. (#​19586)

Bugfixes

• Fix MSC4284 Policy Servers implementation to skip signing org.matrix.msc4284.policy and m.room.policy state events. (#​19503)
• Correctly apply MSC4284 Policy Server signatures to events when the sender and policy server have the same server name. (#​19503)
• Allow Synapse to start up even when discovery fails for an OpenID Connect provider. (#​19509)
• Fix quarantine media admin APIs sometimes returning inaccurate counts for remote media. (#​19559)
• Fix Build and push complement image CI job not having poetry available for the Complement runner script. (#​19578)
• Increase timeout for policy server requests to avoid repeated requests for checking media. (#​19629)

Deprecations and Removals

• Remove support for MSC3852: Expose user agent information on Device as the MSC was closed. (#​19430)

Internal Changes

• Fix small comment typo in config output from the demo/start.sh script. (#​19538)
• Add MSC3820 comment context to RoomVersion attributes. (#​19577)
• Remove redacted_because from internal unsigned. (#​19581)
• Prevent sending registration emails if registration is disabled. (#​19585)
• Port RoomVersion to Rust. (#​19589)
• Only show failing Complement tests in the formatted output in CI. (#​19590)
• Ensure old Complement test files are removed when downloading a Complement checkout via ./scripts-dev/complement.sh. (#​19592)
• Update HomeserverTestCase.pump() docstring to demystify behavior (Twisted reactor/clock). (#​19602)
• Deprecate HomeserverTestCase.pump() in favor of more direct HomeserverTestCase.reactor.advance(...) usage. (#​19602)
• Lower the Postgres database statement_timeout to 10m (previously 1h). (#​19604)

v1.150.0

Compare Source

Synapse 1.150.0 (2026-03-24)

No significant changes since 1.150.0rc1.

Upgrade notes

Please read the upgrade notes as this release includes a few changes that may affect your deployment.

Synapse 1.150.0rc1 (2026-03-17)

Features

• Add experimental support for the MSC4370 Federation API GET /extremities endpoint. (#​19314)
• MSC4140: Cancellable delayed events: When persisting a delayed event to the timeline, include its delay_id in the event's unsigned section in /sync responses to the event sender. (#​19479)
• Expose MSC4354 Sticky Events over the legacy (v3) /sync API. (#​19487)
• When Matrix Authentication Service (MAS) integration is enabled, allow MAS to set the user locked status in Synapse. (#​19554)

Bugfixes

• Fix Build and push complement image CI job pointing to non-existent image. (#​19523)
• Fix a bug introduced in v1.26.0 that caused deactivated, erased users to not be removed from the user directory. (#​19542)

Improved Documentation

• In the Admin API documentation, always express path parameters as /<param> instead of as /$param. (#​19307)
• Update docs to clarify outbound_federation_restricted_to can also be used with the Secure Border Gateway (SBG). (#​19517)
• Unify Complement developer docs. (#​19518)

Internal Changes

• Put membership updates in a background resumable task when changing the avatar or the display name. (#​19311)
• Add in-repo Complement test to sanity check Synapse version matches git checkout (testing what we think we are). (#​19476)
• Migrate dev dependencies to PEP 735 dependency groups. (#​19490)
• Remove the optional systemd-python dependency and the systemd extra on the synapse package. (#​19491)
• Avoid re-computing the event ID when cloning events. (#​19527)
• Allow caching of the /versions and /auth_metadata public endpoints. (#​19530)
• Add a few labels to the number groupings in the Processed request logs. (#​19548)

---

Configuration

📅 Schedule: (UTC)

• Branch creation
  • At any time (no schedule defined)
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.