diff --git a/src/core/chat-api.ts b/src/core/chat-api.ts
index 23e6941d..e624c725 100644
--- a/src/core/chat-api.ts
+++ b/src/core/chat-api.ts
@@ -66,7 +66,7 @@ interface UpdateMessageParams {
   description?: string;
 
   /** Metadata of the update operation */
-  metadata?: Record<string, string>;
+  metadata?: MessageDetailsMetadata;
 }
 
 interface UpdateMessageResponse {