Extend your GPG key expiry
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Find the ID of the expiring key. Note your key ID.
gpg --list-secret-keys
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Start editing the key.
gpg --edit-key KEY_ID
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View your selected key and subkeys
gpg> list -
Select the primary key
gpg> 0 -
Interactively select a new expiry. You'll probably have to unlock your key with its passphrase.
gpg> expire -
Select the primary subkey and repeat the previous
expirestep.gpg> 1 -
Inspect the resulting expiries
gpg> list -
Save when you're done.
gpg> save