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
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Select the primary key
gpg> 0
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Interactively select a new expiry. You'll probably have to unlock your key with its passphrase.
gpg> expire
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Select the primary subkey and repeat the previous
expire
step.gpg> 1
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Inspect the resulting expiries
gpg> list
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Save when you're done.
gpg> save