diff --git a/main.py b/main.py
index 8654400..a81e572 100644
--- a/main.py
+++ b/main.py
@@ -47,7 +47,7 @@ commit_by_me = os.getenv('INPUT_COMMIT_BY_ME')
 ignored_repos_name = str(os.getenv('INPUT_IGNORED_REPOS') or '').replace(' ', '').split(',')
 show_updated_date = os.getenv('INPUT_SHOW_UPDATED_DATE')
 updated_date_format = os.getenv('INPUT_UPDATED_DATE_FORMAT')
-commit_message = os.getenv('INPUT_COMMIT_MESSAGE')
+commit_message = os.getenv('INPUT_COMMIT_MESSAGE', 'sync')
 commit_username = os.getenv('INPUT_COMMIT_USERNAME')
 commit_email = os.getenv('INPUT_COMMIT_EMAIL')
 show_total_code_time = os.getenv('INPUT_SHOW_TOTAL_CODE_TIME')