# Update the Post-quantum Pre-shared Key

The pre-shared secret key is associated with the primary Post-quantum Pre-shared Key (PPK) ID. Follow the steps below to update the secret key.

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Important: To change the primary pre-shared secret on both gateways, you must define the new secret in the Secondary PPK section and then swap the secrets.

## Steps

1. Select Secure SD-WAN.
2. Browse to Other Elements > Post-quantum Preshared Keys.
3. Right-click Post-quantum Preshared Keys element, then select the Properties.
4. Do one of the following:
   1. If you want to update the Primary PPK section with a new pre-shared secret:
      1. Update the Secondary PPK section with the details of the new pre-shared secret.
      2. Click the OK button.
      3. Refresh the current policy. For more details, refer to the Refresh the currently installed policy topic.
      4. Re-open the PPK element properties.
      5. Click the Swap button.
      6. Click the OK button to save the changes.
   2. If both the Primary PPK section and the Secondary PPK sections are already populated and you only want to update the Primary PPK section with the existing Secondary PPK section details:
      1. Click the Swap button.
      2. Click the OK button to save the changes.
5. Refresh the current policy. For more details, refer to the Refresh the currently installed policy topic.