Index: src/services/ActivityPubService.js
===================================================================
--- src/services/ActivityPubService.js	(revision e951b7c4efb52daa3b8964b528fd3f604de85365)
+++ src/services/ActivityPubService.js	(revision ca25f360f73b889318b921f39ff70bb54eb6d853)
@@ -598,4 +598,25 @@
   };
   for (const inbox of inboxes) deliverWithRetry(site.slug, inbox, del, `${me}#main-key`, keys.private_pem);
+}
+
+// Tell followers an already-published post changed (Update + edited Note) so
+// Mastodon refreshes the cached copy (e.g. after fixing content).
+export async function deliverUpdate(site, post) {
+  const base = (process.env.PUBLIC_BASE_URL || '').replace(/\/+$/, '');
+  if (!base || !site || !site.slug || !post || !post.id) return;
+  const followers = fStmts().list.all(site.slug);
+  if (!followers.length) return;
+  const inboxes = [...new Set(followers.map((f) => f.shared_inbox || f.inbox).filter(Boolean))];
+  const keys = getOrCreateKeys(site.slug);
+  const me = actorId(base, site.slug);
+  const note = buildNote(base, site, post);
+  note.updated = new Date().toISOString();
+  const update = {
+    '@context': 'https://www.w3.org/ns/activitystreams',
+    id: `${noteId(base, post.id)}#update-${Date.now()}`,
+    type: 'Update', actor: me, to: [PUBLIC], cc: [`${me}/followers`],
+    object: note,
+  };
+  for (const inbox of inboxes) deliverWithRetry(site.slug, inbox, update, `${me}#main-key`, keys.private_pem);
 }
 
@@ -930,5 +951,5 @@
   getOrCreateKeys, apWants, sendAP, actorId, noteId,
   buildActor, buildNote, buildCreate, buildOutbox, buildFollowers,
-  followerCount, deliver, fetchActor, verifyRequest, handleInbox, deliverCreate, deliverDelete,
+  followerCount, deliver, fetchActor, verifyRequest, handleInbox, deliverCreate, deliverDelete, deliverUpdate,
   getInteractions, getInteractionById, buildReplyNote, getOutboxNote, deliverReply, resolveRemoteNote,
   listOutbox, deliverOutboxDelete,