Failed to join room

When using Riot app on linux, I get an error when attempting to join an encrypted room.

Failed to join room
Sorry, your homeserver is too old to participate in this room.
Please contact your homeserver administrator.

The Matrix protocol was just updated, so that is running a new version, which is incompatible with old versions. Purism will need to update their backend software. Hopefully won’t be too long.

Thank you. I hope so too.