diff --git a/with-webhooks/src/types/index.ts b/with-webhooks/src/types/index.ts
index 92a9c3eb..84eb6de1 100644
--- a/with-webhooks/src/types/index.ts
+++ b/with-webhooks/src/types/index.ts
@@ -5,7 +5,8 @@ export type EmailType =
   | 'email.complained'
   | 'email.bounced'
   | 'email.opened'
-  | 'email.clicked';
+  | 'email.clicked'
+  | 'email.failed';
 
 export interface WebhookEvent {
   created_at: string;