diff --git a/packages/html-parser/src/html-parser.test.ts b/packages/html-parser/src/html-parser.test.ts
index e6983799..f52bbc82 100644
--- a/packages/html-parser/src/html-parser.test.ts
+++ b/packages/html-parser/src/html-parser.test.ts
@@ -64,6 +64,14 @@ describe('HtmlMessageEntityParser', () => {
             )
         })
 
+        it('should handle collapsible blockquotes', () => {
+            test(
+                'plain blockquote plain',
+                [createEntity('messageEntityBlockquote', 6, 10, { collapsed: true })],
+                'plain <blockquote collapsible>blockquote</blockquote> plain',
+            )
+        })
+
         it('should handle links and text mentions', () => {
             test(
                 'plain https://google.com google @durov Pavel Durov mail@mail.ru plain',
@@ -253,13 +261,21 @@ describe('HtmlMessageEntityParser', () => {
                 [
                     createEntity('messageEntityCode', 6, 4),
                     createEntity('messageEntityPre', 11, 3, { language: '' }),
-                    createEntity('messageEntityBlockquote', 15, 10),
+                    createEntity('messageEntityBlockquote', 15, 10, { collapsed: false }),
                     createEntity('messageEntitySpoiler', 26, 7),
                 ],
                 'plain code pre blockquote spoiler plain',
             )
         })
 
+        it('should handle collapsible blockquotes', () => {
+            test(
+                htm`plain <blockquote collapsible>blockquote</blockquote> plain`,
+                [createEntity('messageEntityBlockquote', 6, 10, { collapsed: true })],
+                'plain blockquote plain',
+            )
+        })
+
         it('should handle links and text mentions', () => {
             test(
                 htm`plain https://google.com <a href="https://google.com">google</a> @durov <a href="tg://user?id=36265675">Pavel Durov</a> plain`,
diff --git a/packages/html-parser/src/index.ts b/packages/html-parser/src/index.ts
index c6de4896..4ecfe666 100644
--- a/packages/html-parser/src/index.ts
+++ b/packages/html-parser/src/index.ts
@@ -105,6 +105,7 @@ function parse(
                         _: 'messageEntityBlockquote',
                         offset: plainText.length,
                         length: 0,
+                        collapsed: 'collapsible' in attribs,
                     }
                     break
                 case 'code':
@@ -372,7 +373,6 @@ function _unparse(
             case 'messageEntityUnderline':
             case 'messageEntityStrike':
             case 'messageEntityCode':
-            case 'messageEntityBlockquote':
             case 'messageEntitySpoiler':
                 {
                     const tag = (
@@ -382,13 +382,15 @@ function _unparse(
                             messageEntityUnderline: 'u',
                             messageEntityStrike: 's',
                             messageEntityCode: 'code',
-                            messageEntityBlockquote: 'blockquote',
                             messageEntitySpoiler: 'spoiler',
                         } as const
                     )[type]
                     html.push(`<${tag}>${entityText}</${tag}>`)
                 }
                 break
+            case 'messageEntityBlockquote':
+                html.push(`<blockquote${entity.collapsed ? ' collapsible' : ''}>${entityText}</blockquote>`)
+                break
             case 'messageEntityPre':
                 html.push(
                     `<pre${entity.language ? ` language="${entity.language}"` : ''}>${