Debian Signing Key Expired

Hi,

While running apt-get on my local system I encountered an error from APT complaining that the key had expired for keybase. Looking at the GPG key it does appear to have expired. Is there a new key published yet?

Reading package lists... Done
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://prerelease.keybase.io/deb stable InRelease: The following signatures were invalid: EXPKEYSIG 47484E50656D16C7 Keybase.io Code Signing (v1) <code@keybase.io>
W: Failed to fetch http://prerelease.keybase.io/deb/dists/stable/InRelease  The following signatures were invalid: EXPKEYSIG 47484E50656D16C7 Keybase.io Code Signing (v1) <code@keybase.io>
W: Some index files failed to download. They have been ignored, or old ones used instead.

pub   rsa4096 2013-11-19 [SC] [expired: 2017-11-19]
      222B 85B0 F90B E2D2 4CFE  B93F 4748 4E50 656D 16C7
uid           [ expired] Keybase.io Code Signing (v1) <code@keybase.io>

The report contains no repository file or test entry point; start by checking the Debian repository signing-key publication and the expired Keybase.io Code Signing key shown in the apt-get output. Done means a replacement signing key is published and apt-get can verify the stable InRelease without the EXPKEYSIG error.