diff --git a/README.md b/README.md
index 157bdee3..98c9131a 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,7 @@
 
 ## 細かい変更点
 
+- デフォルトで検索エンジンからのクロールを拒否するように変更
 - 検索の MFM で使用する検索エンジンを設定から変更可能に
   - 以下の選択肢から選べます
     - DuckDuckGo (duckduckgo.com)
diff --git a/packages/backend/migration/1606191203881-no-crawle.js b/packages/backend/migration/1606191203881-no-crawle.js
index 4e7e8227..8eee71a2 100644
--- a/packages/backend/migration/1606191203881-no-crawle.js
+++ b/packages/backend/migration/1606191203881-no-crawle.js
@@ -4,7 +4,7 @@ export class noCrawle1606191203881 {
 	}
 	async up(queryRunner) {
 		await queryRunner.query(
-			`ALTER TABLE "user_profile" ADD "noCrawle" boolean NOT NULL DEFAULT false`,
+			`ALTER TABLE "user_profile" ADD "noCrawle" boolean NOT NULL DEFAULT true`,
 		);
 		await queryRunner.query(
 			`COMMENT ON COLUMN "user_profile"."noCrawle" IS 'Whether reject index by crawler.'`,
diff --git a/packages/backend/src/models/entities/user-profile.ts b/packages/backend/src/models/entities/user-profile.ts
index 0b886386..19c811cf 100644
--- a/packages/backend/src/models/entities/user-profile.ts
+++ b/packages/backend/src/models/entities/user-profile.ts
@@ -162,7 +162,7 @@ export class UserProfile {
 	public autoAcceptFollowed: boolean;
 
 	@Column("boolean", {
-		default: false,
+		default: true,
 		comment: "Whether reject index by crawler.",
 	})
 	public noCrawle: boolean;