diff --git a/api/@internal/component/ets/web.d.ts b/api/@internal/component/ets/web.d.ts
index 7c4fe3d231370490dc8bfe17766c7dfa8792748a..eef1cfb8e6281c7c376c5ddcada0a33b1295b080 100644
--- a/api/@internal/component/ets/web.d.ts
+++ b/api/@internal/component/ets/web.d.ts
@@ -10169,6 +10169,15 @@ declare interface SslErrorEvent {
    * @since 12
    */
   isMainFrame: boolean;
+
+  /**
+   * Certificate chain data in DER format.
+   *
+   * @type { ?Array<Uint8Array> }
+   * @syscap SystemCapability.Web.Webview.Core
+   * @since 21
+   */
+  certChainData?: Array<Uint8Array>;
 }
 
 /**