diff --git a/packages/backend/package.json b/packages/backend/package.json
index 4152a7851f..7ea1ec3c7f 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -66,6 +66,7 @@
 		"fluent-ffmpeg": "2.1.2",
 		"form-data": "4.0.0",
 		"got": "12.5.3",
+		"happy-dom": "^8.7.0",
 		"hpagent": "1.2.0",
 		"ioredis": "4.28.5",
 		"ip-cidr": "3.1.0",
diff --git a/packages/backend/src/core/MfmService.ts b/packages/backend/src/core/MfmService.ts
index 8d961452c7..9b2d5dc0ff 100644
--- a/packages/backend/src/core/MfmService.ts
+++ b/packages/backend/src/core/MfmService.ts
@@ -1,7 +1,7 @@
 import { URL } from 'node:url';
 import { Inject, Injectable } from '@nestjs/common';
 import * as parse5 from 'parse5';
-import { JSDOM } from 'jsdom';
+import { Window } from 'happy-dom';
 import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
 import { intersperse } from '@/misc/prelude/array.js';
@@ -235,7 +235,7 @@ export class MfmService {
 			return null;
 		}
 	
-		const { window } = new JSDOM('');
+		const { window } = new Window();
 	
 		const doc = window.document;
 	
@@ -300,7 +300,7 @@ export class MfmService {
 	
 			hashtag: (node) => {
 				const a = doc.createElement('a');
-				a.href = `${this.config.url}/tags/${node.props.hashtag}`;
+				a.setAttribute('href', `${this.config.url}/tags/${node.props.hashtag}`);
 				a.textContent = `#${node.props.hashtag}`;
 				a.setAttribute('rel', 'tag');
 				return a;
@@ -326,7 +326,7 @@ export class MfmService {
 	
 			link: (node) => {
 				const a = doc.createElement('a');
-				a.href = node.props.url;
+				a.setAttribute('href', node.props.url);
 				appendChildren(node.children, a);
 				return a;
 			},
@@ -335,7 +335,7 @@ export class MfmService {
 				const a = doc.createElement('a');
 				const { username, host, acct } = node.props;
 				const remoteUserInfo = mentionedRemoteUsers.find(remoteUser => remoteUser.username === username && remoteUser.host === host);
-				a.href = remoteUserInfo ? (remoteUserInfo.url ? remoteUserInfo.url : remoteUserInfo.uri) : `${this.config.url}/${acct}`;
+				a.setAttribute('href', remoteUserInfo ? (remoteUserInfo.url ? remoteUserInfo.url : remoteUserInfo.uri) : `${this.config.url}/${acct}`);
 				a.className = 'u-url mention';
 				a.textContent = acct;
 				return a;
@@ -360,14 +360,14 @@ export class MfmService {
 	
 			url: (node) => {
 				const a = doc.createElement('a');
-				a.href = node.props.url;
+				a.setAttribute('href', node.props.url);
 				a.textContent = node.props.url;
 				return a;
 			},
 	
 			search: (node) => {
 				const a = doc.createElement('a');
-				a.href = `https://www.google.com/search?q=${node.props.query}`;
+				a.setAttribute('href', `https://www.google.com/search?q=${node.props.query}`);
 				a.textContent = node.props.content;
 				return a;
 			},
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 3de15a2535..e10bc07487 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -142,6 +142,7 @@ importers:
       fluent-ffmpeg: 2.1.2
       form-data: 4.0.0
       got: 12.5.3
+      happy-dom: ^8.7.0
       hpagent: 1.2.0
       ioredis: 4.28.5
       ip-cidr: 3.1.0
@@ -248,6 +249,7 @@ importers:
       fluent-ffmpeg: 2.1.2
       form-data: 4.0.0
       got: 12.5.3
+      happy-dom: 8.7.0
       hpagent: 1.2.0
       ioredis: 4.28.5
       ip-cidr: 3.1.0
@@ -4821,6 +4823,10 @@ packages:
     engines: {node: '>= 6'}
     dev: false
 
+  /css.escape/1.5.1:
+    resolution: {integrity: sha512-YUifsXXuknHlUsmlgyY0PKzgPOr7/FjCePfHNt0jxm83wHZi44VDMQ7/fGNkjY3/jV1MC+1CmZbaHzugyeRtpg==}
+    dev: false
+
   /cssesc/3.0.0:
     resolution: {integrity: sha512-/Tb/JcjK111nNScGob5MNtsntNM1aCNUDipB/TkwZFhyDrrE47SOx/18wF2bbjgc3ZzCSKW1T5nt5EbFoAz/Vg==}
     engines: {node: '>=4'}
@@ -7080,6 +7086,19 @@ packages:
     engines: {node: '>=0.8.0'}
     dev: false
 
+  /happy-dom/8.7.0:
+    resolution: {integrity: sha512-F/mH5l8aQwlfeByB0nU6Lg7a0FBax/nPCYNYg8tn/abdKCmiIJH+gU/5MVysf5XoM6KjJsvkbIaXAmS/8HxXLA==}
+    dependencies:
+      css.escape: 1.5.1
+      he: 1.2.0
+      node-fetch: 2.6.7
+      webidl-conversions: 7.0.0
+      whatwg-encoding: 2.0.0
+      whatwg-mimetype: 3.0.0
+    transitivePeerDependencies:
+      - encoding
+    dev: false
+
   /har-schema/2.0.0:
     resolution: {integrity: sha512-Oqluz6zhGX8cyRaTQlFMPw80bSJVG2x/cFb8ZPhUILGgHka9SsokCCOQgpveePerqidZOrT14ipqfJb7ILcW5Q==}
     engines: {node: '>=4'}
@@ -7182,7 +7201,6 @@ packages:
   /he/1.2.0:
     resolution: {integrity: sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw==}
     hasBin: true
-    dev: true
 
   /hexoid/1.0.0:
     resolution: {integrity: sha512-QFLV0taWQOZtvIRIAdBChesmogZrtuXvVWsFHZTk2SU+anspqZ2vMnoLg7IE1+Uk16N19APic1BuF8bC8c2m5g==}