diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1a379d53efdb..fd423f3fd141 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -49,6 +49,7 @@
 - cacheRemoteFilesの初期値はfalseになりました
 - ファイルアップロード時等にファイル名の拡張子を修正する関数(correctFilename)の挙動を改善
 - Webhookのペイロードにサーバーのurlが含まれるようになりました
+- Webhook設定でsecretを空に出来るように
 - Fix: 一部のfeatured noteを照会できない問題を修正
 - Fix: muteがapiからのuser list timeline取得で機能しない問題を修正
 - Fix: ジョブキュー管理画面の認証を回避できる問題を修正
diff --git a/packages/backend/src/server/api/endpoints/i/webhooks/create.ts b/packages/backend/src/server/api/endpoints/i/webhooks/create.ts
index d13af482b1c0..6daaacac0721 100644
--- a/packages/backend/src/server/api/endpoints/i/webhooks/create.ts
+++ b/packages/backend/src/server/api/endpoints/i/webhooks/create.ts
@@ -34,12 +34,12 @@ export const paramDef = {
 	properties: {
 		name: { type: 'string', minLength: 1, maxLength: 100 },
 		url: { type: 'string', minLength: 1, maxLength: 1024 },
-		secret: { type: 'string', minLength: 1, maxLength: 1024 },
+		secret: { type: 'string', maxLength: 1024, default: '' },
 		on: { type: 'array', items: {
 			type: 'string', enum: webhookEventTypes,
 		} },
 	},
-	required: ['name', 'url', 'secret', 'on'],
+	required: ['name', 'url', 'on'],
 } as const;
 
 // TODO: ロジックをサービスに切り出す
diff --git a/packages/backend/src/server/api/endpoints/i/webhooks/update.ts b/packages/backend/src/server/api/endpoints/i/webhooks/update.ts
index 8f2dcceaa95b..012bacbbe8cf 100644
--- a/packages/backend/src/server/api/endpoints/i/webhooks/update.ts
+++ b/packages/backend/src/server/api/endpoints/i/webhooks/update.ts
@@ -34,13 +34,13 @@ export const paramDef = {
 		webhookId: { type: 'string', format: 'misskey:id' },
 		name: { type: 'string', minLength: 1, maxLength: 100 },
 		url: { type: 'string', minLength: 1, maxLength: 1024 },
-		secret: { type: 'string', minLength: 1, maxLength: 1024 },
+		secret: { type: 'string', maxLength: 1024, default: '' },
 		on: { type: 'array', items: {
 			type: 'string', enum: webhookEventTypes,
 		} },
 		active: { type: 'boolean' },
 	},
-	required: ['webhookId', 'name', 'url', 'secret', 'on', 'active'],
+	required: ['webhookId', 'name', 'url', 'on', 'active'],
 } as const;
 
 // TODO: ロジックをサービスに切り出す