diff --git a/action.yml b/action.yml
index dd34818..8a391e4 100644
--- a/action.yml
+++ b/action.yml
@@ -1,5 +1,5 @@
 # 檔案用途：定義 CLEANUP OLD RELEASES 這個 Docker action 的輸入參數與執行環境
-# 更新日期：2026/07/11 21:02:25
+# 更新日期：2026/07/15 11:17:00
 
 # Action 名稱，會顯示在 action 市集與文件中
 name: 'CLEANUP OLD RELEASES'
@@ -12,10 +12,6 @@ author: 'Jeffery'
 
 # 定義可由使用者或呼叫端傳入的輸入參數
 inputs:
-  # RUNNER_TOKEN 用於授權呼叫 Gitea API；未提供時會改用 secrets
-  RUNNER_TOKEN:
-    # 參數說明，讓呼叫端知道這是 Runner Token
-    description: 'Gitea Runner Token'
   # KEEP_COUNT 用於控制保留的 release 數量
   KEEP_COUNT:
     # 參數說明，這裡表示保留的版本數量
@@ -35,7 +31,7 @@ runs:
     GITEA_SERVER_URL: ${{ gitea.server_url }}
     # GITEA_REPOSITORY 由 Gitea runtime 注入，供程式指定目標 repo
     GITEA_REPOSITORY: ${{ gitea.repository }}
-    # 優先使用傳入的 RUNNER_TOKEN，否則退回 Gitea token secrets
-    RUNNER_TOKEN: ${{ inputs.RUNNER_TOKEN || secrets.GITEA_TOKEN || secrets.RUNNER_TOKEN }}
+    # 使用 Gitea runtime 自動核發的 token，權限僅限當前 repo 且 job 結束即失效
+    GITEA_TOKEN: ${{ gitea.token }}
     # KEEP_COUNT 直接沿用輸入值，交由程式驗證
     KEEP_COUNT: ${{ inputs.KEEP_COUNT }}
diff --git a/src/index.js b/src/index.js
index dfaafb1..a3fd6cc 100644
--- a/src/index.js
+++ b/src/index.js
@@ -400,7 +400,7 @@ function hasBatchFailure(results) {
 async function main() {
   const GITEA_SERVER_URL = normalizeEnvValue(process.env.GITEA_SERVER_URL);
   const GITEA_REPOSITORY = normalizeEnvValue(process.env.GITEA_REPOSITORY);
-  const RUNNER_TOKEN = normalizeEnvValue(process.env.RUNNER_TOKEN) ?? '';
+  const GITEA_TOKEN = normalizeEnvValue(process.env.GITEA_TOKEN) ?? '';
   const KEEP_COUNT = normalizeEnvValue(process.env.KEEP_COUNT) ?? '';
   const MAX_PAGES = normalizeEnvValue(process.env.MAX_PAGES) ?? '';
 
@@ -421,11 +421,11 @@ async function main() {
 
   const keepCount = Number(KEEP_COUNT);
   const authHeaders = {};
-  if (isEmptyOrNull(RUNNER_TOKEN)) {
-    warn('RUNNER_TOKEN is empty; release API calls will be anonymous');
+  if (isEmptyOrNull(GITEA_TOKEN)) {
+    warn('GITEA_TOKEN is empty; release API calls will be anonymous');
   } else {
-    info('RUNNER_TOKEN=[redacted]');
-    authHeaders.Authorization = `token ${RUNNER_TOKEN}`;
+    info('GITEA_TOKEN=[redacted]');
+    authHeaders.Authorization = `token ${GITEA_TOKEN}`;
   }
 
   const serverBase = new URL(GITEA_SERVER_URL);