diff --git a/install/package.json b/install/package.json
index 802811c2ac..a16271a3f8 100644
--- a/install/package.json
+++ b/install/package.json
@@ -35,7 +35,7 @@
         "@isaacs/ttlcache": "1.4.1",
         "@nodebb/spider-detector": "2.0.3",
         "@popperjs/core": "2.11.8",
-        "ace-builds": "1.35.5",
+        "ace-builds": "1.36.0",
         "archiver": "7.0.1",
         "async": "3.2.6",
         "autoprefixer": "10.4.20",
diff --git a/src/notifications.js b/src/notifications.js
index 5b5db836ac..8d80abf0b1 100644
--- a/src/notifications.js
+++ b/src/notifications.js
@@ -479,7 +479,7 @@ Notifications.merge = async function (notifications) {
 				case 'notifications:user-flagged-post-in':
 				case 'notifications:user-flagged-user':
 				case 'notifications:activitypub.announce': {
-					const usernames = _.uniq(set.map(notifObj => notifObj && notifObj.user && notifObj.user.username));
+					const usernames = _.uniq(set.map(notifObj => notifObj && notifObj.user && notifObj.user.displayname));
 					const numUsers = usernames.length;
 
 					const title = utils.decodeHTMLEntities(notifications[modifyIndex].topicTitle || '');