I'm trying to update my Obarun install, but I run into the following:

[lijster@bes ~]$ sudo pacman -Sy error: obcommunity: signature from "GPG_SIGN_KEY (Gpg key to sign package through git builder) <pkg@obarun.org>" is invalid :: Synchronizing package databases... obcore is up to date obextra is up to date obcommunity 30.5 KiB 381 KiB/s 00:00 [###########################################################] 100% observice is up to date core is up to date extra is up to date error: obcommunity: signature from "GPG_SIGN_KEY (Gpg key to sign package through git builder) <pkg@obarun.org>" is invalid error: failed to synchronize all databases (unexpected error)

I tried upgrading obarun-keyring, I applied the actions suggested in https://web.obarun.org/index.php?id=138 , but no joy so far. What can I do?