If you are using RSA keys generated by yubikey 4 (version < 4.3.5) then you should probably make some new keys (off-chip): https://www.yubico.com/support/security-advisories/ysa-2017-01/
@ebarrett not related but your toot reminded me that my key has expired early in September :P
/me recalls the steps we did to extend the key in Cambridge
@ebarrett we were setting it only for the ssb (the encryption subkey) key right not the primary?
@mulander Looking at my keychain, I have unlimited expiration on the master key, then fixed expiration on the subkeys.
@ebarrett I just extended mine, same configuration (unlimited on the master and expires on the ssb). It should be up on the keyservers.
@mulander Just waiting for propogations...
@ebarrett it's kind of sad that neither I nor anyone else noticed. Shows how little use GPG actually gets.
@mulander I use GPG a lot to encrypt to myself. You notice very quickly under this scenario!