diff --git a/packages/misskey-js/src/autogen/types.ts b/packages/misskey-js/src/autogen/types.ts
index 1f4316a365..bf689db407 100644
--- a/packages/misskey-js/src/autogen/types.ts
+++ b/packages/misskey-js/src/autogen/types.ts
@@ -6282,7 +6282,7 @@ export type operations = {
       content: {
         'application/json': {
           /** Format: misskey:id */
-          announcementId?: string;
+          announcementId: string;
         };
       };
     };