> For the complete documentation index, see [llms.txt](https://help.cerby.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.cerby.com/setup-and-admin/workspace-settings/webhooks/rotate-a-webhook-signing-key.md).

# Rotate a webhook signing key

{% hint style="info" %}
**Who can use this feature?**

* Workspace **Owners**, **Super Admins**, and **Admins**
* Supported using the **Cerby web app**
  {% endhint %}

As a workspace **Owner**, **Super Admin**, or **Admin**, you can rotate a webhook's signing key when a key is compromised or as part of a regular key rotation policy. During rotation, Cerby dual-signs requests with both the old and new keys for 24 hours, giving your system time to update its stored key before the old key expires. You cannot start a second rotation while a grace period is active.

During the 24-hour grace period, each delivery includes two `X-Cerby-Signature` headers and two `X-Cerby-Signature-Key-Id` headers, with the new key first. Accept the request if either signature validates.

To rotate a signing key, complete the following steps:

1. Log in to your [Cerby](https://app.cerby.com/) workspace.
2. Select **Settings** from the left navigation. The **Workspace Configuration** page is displayed.
3. Select the **Webhooks** left tab.
4. Click the name of the webhook whose key you want to rotate. The webhook detail page is displayed.
5. Locate the **Signing and verification** card and click the rotate button:

   * **Ed25519:** Click **Rotate public key**.
   * **HMAC-SHA256:** Click **Rotate secret**.

   A confirmation dialog box is displayed, describing the 24-hour dual-sign grace period.
6. Review the confirmation and click the confirm button:

   * **Ed25519:** Click **Rotate public key**.
   * **HMAC-SHA256:** Click **Rotate secret**.

   For **Ed25519**, the rotation begins immediately. The new public key appears in the **Signing and verification** card.

   For **HMAC-SHA256**, a dialog box is displayed showing the new signing secret.

{% hint style="danger" %}
**HMAC-SHA256 only:** Copy the new **Signing secret** value before closing the dialog box. Cerby displays it only once and cannot recover it.
{% endhint %}

7. Update your stored key in your verification system.
8. Click the **Done** button. Cerby begins dual-signing requests with both the old and new keys. After 24 hours, Cerby automatically expires the old key.

Now you are done.

## Related articles

**Developer reference:**

* [Implement a webhook receiver](https://github.com/cerbyinc/help-center/tree/main/extending_cerby/public-api/implement-a-webhook-receiver.md)

**Troubleshooting:**

* [Troubleshooting: Webhook deliveries failing](https://github.com/cerbyinc/help-center/tree/main/tips_and_troubleshooting/troubleshooting/webhooks/troubleshooting-webhook-deliveries-failing.md)


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