gpg: revoke old key, publish new key?

I've read the manpage, and I'm still in the dark.  See my X-PGP-Key:
header.  That key mentions my old ISP which recently died.  I'd like to
replace that key with one which mentions recent developments.

   gpg --edit-key revkey
   gpg --gen-key
   # upload new key to keyserver

Is that how it's done?  What am I missing?

Thanks.


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