diff --git a/update_files.py b/update_files.py
index 189c41b..31be79a 100644
--- a/update_files.py
+++ b/update_files.py
@@ -21,7 +21,7 @@ def main():
         print("list.yaml 文件不存在。")
         sys.exit(0)
 
-    modified = False
+    modified = True
 
     for item in items:
         file_path = item.get("file")
@@ -65,6 +65,7 @@ def main():
         token = os.environ.get("REPO_TOKEN")
         new_repo_url = repo_url.replace("https://", f"https://oauth2:{token}@")
         subprocess.run(["git", "remote", "set-url", "origin", new_repo_url], check=True)
+        subprocess.run(["git", "checkout", "-B", "main"], check=True)
         subprocess.run(["git", "add", "."], check=True)
         commit_message = "自动更新：从 list.yaml 下载最新文件"
         # 如果没有变更，则 git commit 会返回非零状态，可用 || true 处理