diff --git a/download_deps.py b/download_deps.py
index d140be347..a3fa49f0e 100644
--- a/download_deps.py
+++ b/download_deps.py
@@ -16,7 +16,7 @@ import os
 import urllib.request
 import argparse
 
-def get_urls(use_china_mirrors=False) -> Union[str, list[str]]:
+def get_urls(use_china_mirrors=False) -> list[Union[str, list[str]]]:
     if use_china_mirrors:
         return [
             "http://mirrors.tuna.tsinghua.edu.cn/ubuntu/pool/main/o/openssl/libssl1.1_1.1.1f-1ubuntu2_amd64.deb",