diff --git a/app/git.js b/app/git.js
index 36b01a9..a183851 100644
--- a/app/git.js
+++ b/app/git.js
@@ -1,36 +1,49 @@
-import { spawnSync } from 'child_process';
+import fs from 'fs';
 import path from 'path';
-import { GITEA_SERVER_URL, GITEA_REPOSITORY, GITEA_TOKEN, PR_HEAD_BRANCH, FINDINGS_PATH } from './config.js';
+import axios from 'axios';
+import https from 'https';
+import { GITEA_TOKEN, GITEA_SERVER_URL, GITEA_REPOSITORY, PR_HEAD_BRANCH, FINDINGS_PATH } from './config.js';
 
-function git(args, cwd) {
-  const result = spawnSync('git', args, { cwd, encoding: 'utf8' });
-  if (result.error) throw result.error;
-  if (result.status !== 0) throw new Error((result.stderr || result.stdout || '').trim());
-  return (result.stdout || '').trim();
-}
+const httpsAgent = new https.Agent({ rejectUnauthorized: false });
+const headers = () => ({ Authorization: `token ${GITEA_TOKEN}`, 'Content-Type': 'application/json' });
+const api = (p) => `${GITEA_SERVER_URL.replace(/\/$/, '')}/api/v1${p}`;
 
 export async function commitAndPush(workspace) {
-  const repoDir = path.join(workspace, GITEA_REPOSITORY);
-  const remoteUrl = GITEA_SERVER_URL.replace(/\/$/, '').replace('https://', `https://${GITEA_TOKEN}@`).replace('http://', `http://${GITEA_TOKEN}@`) + `/${GITEA_REPOSITORY}.git`;
-
   try {
-    git(['config', 'user.email', 'ai-review[bot]@gitea'], repoDir);
-    git(['config', 'user.name', 'AI Review Bot'], repoDir);
-    git(['fetch', 'origin', PR_HEAD_BRANCH], repoDir);
-    git(['checkout', PR_HEAD_BRANCH], repoDir);
-    git(['add', FINDINGS_PATH], repoDir);
+    const fullPath = path.join(workspace, GITEA_REPOSITORY, FINDINGS_PATH);
+    const content = fs.readFileSync(fullPath, 'utf8');
+    const encoded = Buffer.from(content).toString('base64');
+    const url = api(`/repos/${GITEA_REPOSITORY}/contents/${FINDINGS_PATH}`);
 
-    const status = git(['status', '--porcelain'], repoDir);
-    if (!status) {
-      console.log('  findings.json 無變更，跳過 commit');
-      return;
+    // 取得現有檔案 SHA（若存在）
+    let sha;
+    try {
+      const res = await axios.get(`${url}?ref=${encodeURIComponent(PR_HEAD_BRANCH)}`, { headers: headers(), httpsAgent, timeout: 15000 });
+      sha = res.data.sha;
+    } catch {
+      sha = undefined;
     }
 
-    const out = git(['commit', '-m', 'chore: update ai-review findings [skip ci]'], repoDir);
-    const commitHash = out.match(/\[.+ ([a-f0-9]+)\]/)?.[1] || 'unknown';
-    git(['push', remoteUrl, PR_HEAD_BRANCH], repoDir);
+    const payload = JSON.stringify({
+      message: 'chore: update ai-review findings [skip ci]',
+      content: encoded,
+      branch: PR_HEAD_BRANCH,
+      ...(sha ? { sha } : {}),
+    });
+
+    const resp = await axios.request({
+      method: sha ? 'put' : 'post',
+      url,
+      headers: { ...headers(), 'Content-Type': 'application/json' },
+      httpsAgent,
+      timeout: 30000,
+      data: payload,
+    });
+
+    const commitHash = resp.data.commit?.sha?.slice(0, 7) || 'unknown';
     console.log(`  ✅ persisted findings  commit=${commitHash}  push=${PR_HEAD_BRANCH}`);
   } catch (e) {
-    console.log(`  ⚠️  Runner failed: commit/push 失敗: ${e.message}`);
+    const detail = e.response?.data ? JSON.stringify(e.response.data) : e.message;
+    console.log(`  ⚠️  Runner failed: commit/push 失敗: ${e.response?.status || ''} ${detail}`);
   }
 }