Renew subkeys

Import the secret master key

gpg2 --import KEYID

Edit it

gpg2 --expert --edit-key KEYID
gpp> key 1
...
gpp> key 2
...
gpp> key 3
...
gpg> expire
...
Key is valid for? (0) 1y
...
Is this correct? (y/N) y
...
gpg> save

Delete the secret material from your keyring

gpg --delete-secret-keys KEYID

Export and distribute

Now export the public key with the following command. And upload to keys.openpgp.org, then on other machines, use the fetch command from card to retrieve them.

gpg --armor --export KEYID > /tmp/key.pem