diff --git a/CHANGELOG.md b/CHANGELOG.md
index e62b28d8ba..211f6f5319 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@
 - Fix: support `alsoKnownAs` from remote actors as either array or unwrapped singleton
 - Fix: ローカルに存在しないリモートアカウントに対するアカウント削除リクエストを受信した際に、そのユーザーを新規作成して削除する挙動を修正
 - Fix: ID生成アルゴリズムにULIDを使用している場合にMisskeyが正しく動作しない問題を修正
+- Fix: robots.txtの内容を調整
 
 ## 2026.3.2
 
diff --git a/packages/backend/assets/robots.txt b/packages/backend/assets/robots.txt
deleted file mode 100644
index dc17e04e3f..0000000000
--- a/packages/backend/assets/robots.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-user-agent: *
-allow: /
-
-# todo: sitemap
diff --git a/packages/backend/src/server/web/ClientServerService.ts b/packages/backend/src/server/web/ClientServerService.ts
index 24bc619e79..49a802632f 100644
--- a/packages/backend/src/server/web/ClientServerService.ts
+++ b/packages/backend/src/server/web/ClientServerService.ts
@@ -396,7 +396,34 @@ export class ClientServerService {
 		});
 
 		fastify.get('/robots.txt', async (request, reply) => {
-			return await reply.sendFile('/robots.txt', staticAssets);
+			const disallowedPaths = [
+				'/settings',
+				'/admin',
+				'/custom-emojis-manager',
+				'/avatar-decorations',
+				'/share',
+				'/my',
+				'/api',
+				'/inbox',
+				'/oauth',
+				'/proxy',
+				'/url',
+			];
+
+			if (this.meta.ugcVisibilityForVisitor === 'none') {
+				disallowedPaths.push(
+					'/@',
+					'/notes',
+				);
+			}
+
+			let content = `User-agent: *\n`;
+			content += disallowedPaths.map((path) => `Disallow: ${path}`).join('\n') + '\n';
+			content += 'Allow: /\n';
+			content += '\n# todo: sitemap\n';
+
+			reply.header('Content-Type', 'text/plain; charset=utf-8');
+			return await reply.send(content);
 		});
 
 		// OpenSearch XML