We're really excited to release the biggest update yet to Synapse (the python/twisted reference Matrix homeserver implementation) - version 0.5.0 is out!

This effectively concludes our alpha testing phase - Synapse's security model is now feature complete and we are now cautiously encouraging people to run their own Synapse installation on the 'net; federate up; and help us squash all and any bugs as we get beta testing.

Synapse 0.5.0 has huge database schema changes from previous versions as we have landed both the event-signing and federation-authorisation branches and so added full cryptographic signing of all matrix events and unified the client-server and server-server model of events/PDUs.  As a result, migrating history is Hard - we recommend a clean start if possible; if not, come talk to us in #matrix:matrix.org.  UPGRADE.rst has the details.

The full changelog is as per below - please upgrade your homeserver or install a new one if you're new here and join Matrix and help us create a robust open distributed messaging fabric for the web!

Changes in synapse 0.5.0 (2014-11-19)
This release includes changes to the federation protocol and client-server API
that is not backwards compatible.

This release also changes the internal database schemas and so requires servers to drop their current history. See UPGRADES.rst for details.


  • Add authentication and authorization to the federation protocol. Events are now signed by their originating homeservers.
  • Implement the new authorization model for rooms.
  • Split out web client into a separate repository: matrix-angular-sdk.
  • Change the structure of PDUs.
  • Fix bug where user could not join rooms via an alias containing 4-byte UTF-8 characters.
  • Merge concept of PDUs and Events internally.
  • Improve logging by adding request ids to log lines.
  • Implement a very basic room initial sync API.
  • Implement the new invite/join federation APIs.


  • The webclient has been moved to a separate repository.

The Foundation needs you

The Matrix.org Foundation is a non-profit and only relies on donations to operate. Its core mission is to maintain the Matrix Specification, but it does much more than that.

It maintains the matrix.org homeserver and hosts several bridges for free. It fights for our collective rights to digital privacy and dignity.

Support us