## Synapse v0.99 support and preparation for Synapse v1.0
Matrix is undergoing a lot of changes as it matures towards Synapse v1.0.
The first step is the Synapse v0.99 transitional release, which this playbook now supports.
If you've been using this playbook successfully until now, you'd be aware that we've been doing [Server Delegation](docs/howto-server-delegation.md) using a `_matrix._tcp` DNS SRV record (as per [Configuring DNS](docs/configuring-dns.md)).
Due to changes related to certificate file requirements that will affect us at Synapse v1.0, we'll have to stop using a **`_matrix._tcp` DNS SRV record in the future** (when Synapse goes to v1.0 - around 5th of March 2019). We **still need to keep the SRV record for now**, for backward compatibility with older Synapse versions (lower than v0.99).
**What you need to do now** is make use of this transitional Synapse v0.99 release to **prepare your federation settings for the future**. You have 2 choices to prepare yourself for compatibility with the future Synapse v1.0:
- (recommended) set up [Server Delegation via a well-known file](docs/howto-server-delegation.md#server-delegation-via-a-well-known-file), unless you are affected by the [Downsides of well-known-based Server Delegation](docs/howto-server-delegation.md#downsides-of-well-known-based-server-delegation). After some time, when most people have upgraded to Synapse v0.99 and older releases have disappeared, be prepared to drop your `_matrix._tcp` SRV record.
- (more advanced) if the [Downsides of well-known-based Server Delegation](docs/howto-server-delegation.md#downsides-of-well-known-based-server-delegation) are not to your liking, **as an alternative**, you can set up [Server Delegation via a DNS SRV record](docs/howto-server-delegation.md#server-delegation-via-a-dns-serv-record-advanced). In such a case, you get to keep using your existing `_matrix._tcp` DNS SRV record forever and need to NOT set up a `/.well-known/matrix/server` file. Don't forget that you need to do certificate changes though. Follow the guide at [Server Delegation via a DNS SRV record](docs/howto-server-delegation.md#server-delegation-via-a-dns-serv-record-advanced).
Slavi Pantaleev
6 years ago