diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index ac4157c..07ce386 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -101,13 +101,12 @@ jobs:
         run: |
           DMG_PATH=$(ls src-tauri/target/universal-apple-darwin/release/bundle/dmg/*.dmg | head -1)
           rm -f "${DMG_PATH}.sig"
-          # 将私钥写入临时文件（heredoc 保留原始格式）
-          cat > /tmp/private.key << 'PRIVATEKEYEOF'
-          ${{ secrets.TAURI_SIGNING_PRIVATE_KEY }}
-          PRIVATEKEYEOF
+          # 用 python 将私钥写入文件，避免 shell heredoc 缩进问题
+          python3 -c "import os; open('/tmp/private.key','w').write(os.environ['TAURI_SIGNING_PRIVATE_KEY'])"
           npx tauri signer sign -f /tmp/private.key -p "$TAURI_SIGNING_PRIVATE_KEY_PASSWORD" "$DMG_PATH"
           rm -f /tmp/private.key
         env:
+          TAURI_SIGNING_PRIVATE_KEY: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY }}
           TAURI_SIGNING_PRIVATE_KEY_PASSWORD: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY_PASSWORD }}
 
       - name: Upload artifacts