diff --git a/.pnp.cjs b/.pnp.cjs
index a5fedd5a1..367e7018d 100755
--- a/.pnp.cjs
+++ b/.pnp.cjs
@@ -7241,6 +7241,7 @@ const RAW_RUNTIME_STATE =
           ["fluent-ffmpeg", "npm:2.1.2"],\
           ["got", "npm:12.5.3"],\
           ["gunzip-maybe", "npm:1.4.2"],\
+          ["happy-dom", "npm:12.10.3"],\
           ["hpagent", "npm:0.1.2"],\
           ["iceshrimp-js", "workspace:packages/iceshrimp-js"],\
           ["ioredis", "npm:5.3.2"],\
@@ -9594,6 +9595,15 @@ const RAW_RUNTIME_STATE =
         "linkType": "HARD"\
       }]\
     ]],\
+    ["css.escape", [\
+      ["npm:1.5.1", {\
+        "packageLocation": "./.yarn/cache/css.escape-npm-1.5.1-b24d2ba77a-f6d38088d8.zip/node_modules/css.escape/",\
+        "packageDependencies": [\
+          ["css.escape", "npm:1.5.1"]\
+        ],\
+        "linkType": "HARD"\
+      }]\
+    ]],\
     ["cssesc", [\
       ["npm:3.0.0", {\
         "packageLocation": "./.yarn/cache/cssesc-npm-3.0.0-15ec56f86f-0e161912c1.zip/node_modules/cssesc/",\
@@ -13665,6 +13675,21 @@ const RAW_RUNTIME_STATE =
         "linkType": "HARD"\
       }]\
     ]],\
+    ["happy-dom", [\
+      ["npm:12.10.3", {\
+        "packageLocation": "./.yarn/cache/happy-dom-npm-12.10.3-5cca1a5e23-de82ddd1c9.zip/node_modules/happy-dom/",\
+        "packageDependencies": [\
+          ["happy-dom", "npm:12.10.3"],\
+          ["css.escape", "npm:1.5.1"],\
+          ["entities", "npm:4.5.0"],\
+          ["iconv-lite", "npm:0.6.3"],\
+          ["webidl-conversions", "npm:7.0.0"],\
+          ["whatwg-encoding", "npm:2.0.0"],\
+          ["whatwg-mimetype", "npm:3.0.0"]\
+        ],\
+        "linkType": "HARD"\
+      }]\
+    ]],\
     ["hard-rejection", [\
       ["npm:2.1.0", {\
         "packageLocation": "./.yarn/cache/hard-rejection-npm-2.1.0-a80f2a977d-7baaf80a0c.zip/node_modules/hard-rejection/",\
diff --git a/.yarn/cache/css.escape-npm-1.5.1-b24d2ba77a-f6d38088d8.zip b/.yarn/cache/css.escape-npm-1.5.1-b24d2ba77a-f6d38088d8.zip
new file mode 100644
index 000000000..88d9cf7f4
--- /dev/null
+++ b/.yarn/cache/css.escape-npm-1.5.1-b24d2ba77a-f6d38088d8.zip
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:160c2a70b6e934480625dd02e85e70feefcb8c21f14708bc8c5c623ad55f1d78
+size 3793
diff --git a/.yarn/cache/happy-dom-npm-12.10.3-5cca1a5e23-de82ddd1c9.zip b/.yarn/cache/happy-dom-npm-12.10.3-5cca1a5e23-de82ddd1c9.zip
new file mode 100644
index 000000000..128e27f59
--- /dev/null
+++ b/.yarn/cache/happy-dom-npm-12.10.3-5cca1a5e23-de82ddd1c9.zip
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f49c990d09a342bb9602b1c7b5908367bc92dbd4c94e1b82a6e4d12436572079
+size 2333184
diff --git a/packages/backend/package.json b/packages/backend/package.json
index 4e7b7fecf..193b72b3a 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -66,6 +66,7 @@
 		"fluent-ffmpeg": "2.1.2",
 		"got": "12.5.3",
 		"gunzip-maybe": "^1.4.2",
+		"happy-dom": "^12.10.3",
 		"hpagent": "0.1.2",
 		"iceshrimp-js": "workspace:*",
 		"ioredis": "5.3.2",
diff --git a/packages/backend/src/server/api/mastodon/helpers/mfm.ts b/packages/backend/src/server/api/mastodon/helpers/mfm.ts
index c1f69e3af..910ff5fe0 100644
--- a/packages/backend/src/server/api/mastodon/helpers/mfm.ts
+++ b/packages/backend/src/server/api/mastodon/helpers/mfm.ts
@@ -1,5 +1,5 @@
 import { IMentionedRemoteUsers } from "@/models/entities/note.js";
-import { JSDOM } from "jsdom";
+import { Window as HappyDom } from "happy-dom";
 import config from "@/config/index.js";
 import { intersperse } from "@/prelude/array.js";
 import mfm from "mfm-js";
@@ -17,7 +17,7 @@ export class MfmHelpers {
             return null;
         }
 
-        const { window } = new JSDOM("");
+        const { window } = new HappyDom();
 
         const doc = window.document;
 
@@ -101,7 +101,7 @@ export class MfmHelpers {
 
             hashtag(node) {
                 const a = doc.createElement("a");
-                a.href = `${config.url}/tags/${node.props.hashtag}`;
+                a.setAttribute('href', `${config.url}/tags/${node.props.hashtag}`);
                 a.textContent = `#${node.props.hashtag}`;
                 a.setAttribute("rel", "tag");
                 a.setAttribute("class", "hashtag");
@@ -130,7 +130,7 @@ export class MfmHelpers {
                 const a = doc.createElement("a");
                 a.setAttribute("rel", "nofollow noopener noreferrer");
                 a.setAttribute("target", "_blank");
-                a.href = node.props.url;
+                a.setAttribute('href',node.props.url);
                 await appendChildren(node.children, a);
                 return a;
             },
@@ -146,7 +146,7 @@ export class MfmHelpers {
                     el.setAttribute("class", "h-card");
                     el.setAttribute("translate", "no");
                     const a = doc.createElement("a");
-                    a.href = resolved.href;
+                    a.setAttribute('href',resolved.href);
                     a.className = "u-url mention";
                     const span = doc.createElement("span");
                     span.textContent = resolved.username;
@@ -181,14 +181,14 @@ export class MfmHelpers {
                 const a = doc.createElement("a");
                 a.setAttribute("rel", "nofollow noopener noreferrer");
                 a.setAttribute("target", "_blank");
-                a.href = node.props.url;
+                a.setAttribute('href', node.props.url);
                 a.textContent = node.props.url.replace(/^https?:\/\//, '');
                 return a;
             },
 
             search(node) {
                 const a = doc.createElement("a");
-                a.href = `${config.searchEngine}${node.props.query}`;
+                a.setAttribute('href', `${config.searchEngine}${node.props.query}`);
                 a.textContent = node.props.content;
                 return a;
             },
@@ -204,7 +204,7 @@ export class MfmHelpers {
 
         if (quoteUri !== null) {
             const a = doc.createElement("a");
-            a.href = quoteUri;
+            a.setAttribute('href', quoteUri);
             a.textContent = quoteUri.replace(/^https?:\/\//, '');
 
             const quote = doc.createElement("span");
diff --git a/yarn.lock b/yarn.lock
index 0afc21a77..ce9df6b49 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5541,6 +5541,7 @@ __metadata:
     fluent-ffmpeg: "npm:2.1.2"
     got: "npm:12.5.3"
     gunzip-maybe: "npm:^1.4.2"
+    happy-dom: "npm:^12.10.3"
     hpagent: "npm:0.1.2"
     iceshrimp-js: "workspace:*"
     ioredis: "npm:5.3.2"
@@ -7430,6 +7431,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"css.escape@npm:^1.5.1":
+  version: 1.5.1
+  resolution: "css.escape@npm:1.5.1"
+  checksum: f6d38088d870a961794a2580b2b2af1027731bb43261cfdce14f19238a88664b351cc8978abc20f06cc6bbde725699dec8deb6fe9816b139fc3f2af28719e774
+  languageName: node
+  linkType: hard
+
 "css@npm:^3.0.0":
   version: 3.0.0
   resolution: "css@npm:3.0.0"
@@ -8451,7 +8459,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"entities@npm:^4.2.0, entities@npm:^4.4.0":
+"entities@npm:^4.2.0, entities@npm:^4.4.0, entities@npm:^4.5.0":
   version: 4.5.0
   resolution: "entities@npm:4.5.0"
   checksum: ede2a35c9bce1aeccd055a1b445d41c75a14a2bb1cd22e242f20cf04d236cdcd7f9c859eb83f76885327bfae0c25bf03303665ee1ce3d47c5927b98b0e3e3d48
@@ -10968,6 +10976,20 @@ __metadata:
   languageName: node
   linkType: hard
 
+"happy-dom@npm:^12.10.3":
+  version: 12.10.3
+  resolution: "happy-dom@npm:12.10.3"
+  dependencies:
+    css.escape: "npm:^1.5.1"
+    entities: "npm:^4.5.0"
+    iconv-lite: "npm:^0.6.3"
+    webidl-conversions: "npm:^7.0.0"
+    whatwg-encoding: "npm:^2.0.0"
+    whatwg-mimetype: "npm:^3.0.0"
+  checksum: de82ddd1c981f24a95011c62c2d03e12c4c48f86c0234fa7a1a309d8fa1481885956c783fb3cc56371fa49193d2323822a583196156b10db179e7ac754ef7864
+  languageName: node
+  linkType: hard
+
 "hard-rejection@npm:^2.1.0":
   version: 2.1.0
   resolution: "hard-rejection@npm:2.1.0"
@@ -11490,7 +11512,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"iconv-lite@npm:0.6.3, iconv-lite@npm:^0.6.2":
+"iconv-lite@npm:0.6.3, iconv-lite@npm:^0.6.2, iconv-lite@npm:^0.6.3":
   version: 0.6.3
   resolution: "iconv-lite@npm:0.6.3"
   dependencies: