diff --git a/packages/backend/src/remote/activitypub/kernel/update/index.ts b/packages/backend/src/remote/activitypub/kernel/update/index.ts
index 32952a3b6..c81333f92 100644
--- a/packages/backend/src/remote/activitypub/kernel/update/index.ts
+++ b/packages/backend/src/remote/activitypub/kernel/update/index.ts
@@ -29,6 +29,10 @@ export default async (actor: IRemoteUser, activity: IUpdate, resolver: Resolver)
 		await updatePerson(object, resolver);
 		return 'ok: Person updated';
 	} else if (getApType(object) === 'Question') {
+		if (actor.uri !== object.attributedTo) {
+			return 'skip: actor id !== question attributedTo';
+		}
+
 		await updateQuestion(object, resolver).catch(e => console.log(e));
 		return 'ok: Question updated';
 	} else if (isPost(object)) {