diff --git a/packages/quill/src/modules/toolbar.ts b/packages/quill/src/modules/toolbar.ts
index 72dec32993..5794bd765d 100644
--- a/packages/quill/src/modules/toolbar.ts
+++ b/packages/quill/src/modules/toolbar.ts
@@ -61,12 +61,7 @@ class Toolbar extends Module<ToolbarProps> {
         this.attach(input);
       },
     );
-    this.quill.on(Quill.events.EDITOR_CHANGE, (type, range) => {
-      if (type === Quill.events.SELECTION_CHANGE) {
-        this.update(range as Range);
-      }
-    });
-    this.quill.on(Quill.events.SCROLL_OPTIMIZE, () => {
+    this.quill.on(Quill.events.EDITOR_CHANGE, () => {
       const [range] = this.quill.selection.getRange(); // quill.getSelection triggers update
       this.update(range);
     });
diff --git a/packages/quill/src/themes/bubble.ts b/packages/quill/src/themes/bubble.ts
index 9f06992b81..85dcb2e4dc 100644
--- a/packages/quill/src/themes/bubble.ts
+++ b/packages/quill/src/themes/bubble.ts
@@ -106,6 +106,8 @@ class BubbleTooltip extends BaseTooltip {
 }
 
 class BubbleTheme extends BaseTheme {
+  tooltip: BubbleTooltip;
+
   constructor(quill: Quill, options: ThemeOptions) {
     if (
       options.modules.toolbar != null &&
diff --git a/packages/quill/test/unit/core/selection.spec.ts b/packages/quill/test/unit/core/selection.spec.ts
index 0bc394a57b..f3ba0e98df 100644
--- a/packages/quill/test/unit/core/selection.spec.ts
+++ b/packages/quill/test/unit/core/selection.spec.ts
@@ -11,7 +11,7 @@ import Italic from '../../../src/formats/italic';
 import Strike from '../../../src/formats/strike';
 import { ColorStyle } from '../../../src/formats/color';
 import { BackgroundStyle } from '../../../src/formats/background';
-import { FontClass } from '../../../src/formats/font';
+import { SizeClass } from '../../../src/formats/size';
 
 const createSelection = (html: string, container = document.body) => {
   const scroll = createScroll(
@@ -25,7 +25,7 @@ const createSelection = (html: string, container = document.body) => {
       Link,
       ColorStyle,
       BackgroundStyle,
-      FontClass,
+      SizeClass,
     ]),
     container,
   );
diff --git a/packages/quill/test/unit/modules/toolbar.spec.ts b/packages/quill/test/unit/modules/toolbar.spec.ts
index bdae05f9f9..1c81aa3ffd 100644
--- a/packages/quill/test/unit/modules/toolbar.spec.ts
+++ b/packages/quill/test/unit/modules/toolbar.spec.ts
@@ -236,5 +236,14 @@ describe('Toolbar', () => {
       expect(centerButton.getAttribute('aria-pressed')).toBe('false');
       expect(leftButton.getAttribute('aria-pressed')).toBe('false');
     });
+
+    test('update on format', function () {
+      const { container, quill } = setup();
+      const boldButton = container?.parentNode?.querySelector('button.ql-bold');
+      quill.setSelection(1, 2);
+      expect(boldButton?.classList.contains('ql-active')).toBe(false);
+      quill.format('bold', true, 'user');
+      expect(boldButton?.classList.contains('ql-active')).toBe(true);
+    });
   });
 });