diff --git a/ghost/admin/package.json b/ghost/admin/package.json
index d3311d6039..75d08183a4 100644
--- a/ghost/admin/package.json
+++ b/ghost/admin/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ghost-admin",
-  "version": "5.14.0",
+  "version": "5.14.1",
   "description": "Ember.js admin client for Ghost",
   "author": "Ghost Foundation",
   "homepage": "http://ghost.org",
@@ -38,7 +38,7 @@
     "@ember/test-helpers": "2.8.1",
     "@embroider/macros": "1.8.3",
     "@glimmer/component": "1.1.2",
-    "@html-next/vertical-collection": "3.1.0",
+    "@html-next/vertical-collection": "3.0.0",
     "@joeattardi/emoji-button": "4.6.4",
     "@sentry/ember": "7.12.1",
     "@tryghost/color-utils": "0.1.21",
diff --git a/ghost/admin/tests/acceptance/editor-test.js b/ghost/admin/tests/acceptance/editor-test.js
index 501b776981..2ae4be6cea 100644
--- a/ghost/admin/tests/acceptance/editor-test.js
+++ b/ghost/admin/tests/acceptance/editor-test.js
@@ -4,7 +4,7 @@ import sinon from 'sinon';
 import {Response} from 'miragejs';
 import {authenticateSession, invalidateSession} from 'ember-simple-auth/test-support';
 import {beforeEach, describe, it} from 'mocha';
-import {blur, click, currentRouteName, currentURL, fillIn, find, findAll, triggerEvent} from '@ember/test-helpers';
+import {blur, click, currentRouteName, currentURL, fillIn, find, findAll, triggerEvent, typeIn} from '@ember/test-helpers';
 import {datepickerSelect} from 'ember-power-datepicker/test-support';
 import {expect} from 'chai';
 import {selectChoose} from 'ember-power-select/test-support';
@@ -614,5 +614,23 @@ describe('Acceptance: Editor', function () {
             let body = JSON.parse(lastRequest.requestBody);
             expect(body.posts[0].title).to.equal('CMD-S Test');
         });
+
+        // https://github.com/TryGhost/Ghost/issues/15391
+        it('can handle many tags in PSM tags input', async function () {
+            this.server.createList('tag', 1000);
+            let post = this.server.create('post', {authors: [author]});
+
+            await visit(`/editor/post/${post.id}`);
+            await click('[data-test-psm-trigger]');
+            await click('[data-test-token-input]');
+
+            // by filtering to `Tag 100` it means we start with a long list that is reduced
+            // which is what triggers the slowdown/error
+            await fillIn('[data-test-token-input] input', 'Tag 10');
+            await typeIn('[data-test-token-input] input', '0');
+            await blur('[data-test-token-input] input');
+
+            // no expects, will throw with an error and fail when it hits the bug
+        });
     });
 });
diff --git a/ghost/core/package.json b/ghost/core/package.json
index c3a011b67d..4e9f4c9195 100644
--- a/ghost/core/package.json
+++ b/ghost/core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ghost",
-  "version": "5.14.0",
+  "version": "5.14.1",
   "description": "The professional publishing platform",
   "author": "Ghost Foundation",
   "homepage": "https://ghost.org",
diff --git a/yarn.lock b/yarn.lock
index 7d4f648997..438ac01f8f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2520,10 +2520,10 @@
   resolved "https://registry.yarnpkg.com/@handlebars/parser/-/parser-2.0.0.tgz#5e8b7298f31ff8f7b260e6b7363c7e9ceed7d9c5"
   integrity sha512-EP9uEDZv/L5Qh9IWuMUGJRfwhXJ4h1dqKTT4/3+tY0eu7sPis7xh23j61SYUnNF4vqCQvvUXpDo9Bh/+q1zASA==
 
-"@html-next/vertical-collection@3.1.0":
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/@html-next/vertical-collection/-/vertical-collection-3.1.0.tgz#3e271fe36bbf381b5e6f7702fde72f8c6880ae0d"
-  integrity sha512-7mzdEhPA0SzIAqZA/HUwmAYVxzbsKp4l8vB7oBc6A71IGusrNZQUMLl09Vi9wgHahvhBV89LST474cu9k2Iw1Q==
+"@html-next/vertical-collection@3.0.0":
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/@html-next/vertical-collection/-/vertical-collection-3.0.0.tgz#ba16bd2df413e9c25d245ae37ddb1950a5ccdbca"
+  integrity sha512-kpLYZXr3tlYkrSiyhww+f1YkyLMEhCm9h55A+PWPzJXBTZkV12sC5mIbxVcWD7q5QNjy634m6MMvmxfFgDmGoQ==
   dependencies:
     babel6-plugin-strip-class-callcheck "^6.0.0"
     broccoli-funnel "^2.0.2"