diff --git a/src/lib/index.ts b/src/lib/index.ts
index 9092bf1..bc7b291 100644
--- a/src/lib/index.ts
+++ b/src/lib/index.ts
@@ -1 +1,2 @@
 export * from './seam-webhook.js'
+export { WebhookVerificationError as SeamWebhookVerificationError } from 'svix'
diff --git a/src/lib/seam-webhook.ts b/src/lib/seam-webhook.ts
index acfeee5..2a3210e 100644
--- a/src/lib/seam-webhook.ts
+++ b/src/lib/seam-webhook.ts
@@ -9,6 +9,10 @@ export class SeamWebhook {
   }
 
   verify(payload: string, headers: Record<string, string>): SeamEvent {
-    return this.#webhook.verify(payload, headers) as SeamEvent
+    const normalizedHeaders = Object.fromEntries(
+      Object.entries(headers).map(([key, value]) => [key.toLowerCase(), value]),
+    )
+
+    return this.#webhook.verify(payload, normalizedHeaders) as SeamEvent
   }
 }