Synapse 1.42 and 1.43 both support Room Version 9, and should be available pretty much everywhere. Do you know what distro your homeserver admin is running? Looks like FreeBSD and Ubuntu might be lagging, but Arch, Debian, Docker, Fedora, openSUSE, etc. all look fine. If you're on Ubuntu, we maintain our own repository with debs for the currently supported Debian and Ubuntu releases: https://matrix-org.github.io/synapse/v1.43/setup/installatio...
I talked to the room admin and apparently when they create a new room (latest synapse, latest element) it gets set to v9 by default and they can't do anything about it.
let
newerPkgs = import (builtins.fetchGit {
name = "release-21.05-pkgs";
url = "https://github.com/NixOS/nixpkgs/";
ref = "refs/heads/release-21.05";
rev = "8d6407e5a442e5e2fc50c3ca36411b6995afbc17";
}) {};
in
I may have the syntax slightly wrong, but something like that.
Edit: Ah, except Synapse is a service, so things get a little more complicated. https://nixos.wiki/wiki/FAQ/Pinning_Nixpkgs has some pointers.
Where I'm coming from is getting dumped out of a room that switched to spaces, and the room's server's admin telling me they got an error message that my homeserver does not support that room version, and my homeserver's admin saying they're on afatk the latest stable release of synapse, and then checking the spec and finding no mention of that room version at all. This is an absolutely trash user experience and certainly colored my response. As it is, I can't speak in said room and the room admin doesn't know how to fix that and neither do I.
The problematic room's server's admin must have been misinformed in this case, that's where I have the info about v9 being the default.