diff --git a/hiking_assistant/assets/config.yaml b/hiking_assistant/assets/config.yaml
index 79100f9..4c32fe8 100644
--- a/hiking_assistant/assets/config.yaml
+++ b/hiking_assistant/assets/config.yaml
@@ -2,7 +2,7 @@ app:
   page_title: 臺灣登山小幫手
   page_favicon_path: ./assets/favicon_compressed.jpg
   page_footer_text: ⚠️ 本服務提供之資訊僅供規劃參考，山區氣候瞬息萬變，請務必依據現場狀況與自身能力進行風險評估<br>Made with ❤️ by <a href="https://gitea.guineapig.love/deng">deng</a>
-  page_background_path: ./assets/background_op70.jpg
+  page_background_path: ./assets/background_op70.png
   altitude_sickness:
     elevation_threshold: 2100
     warning_text: 此路線海拔較高，請留意[高山症](https://www.ysnp.gov.tw/StaticPage/MountainSickness)發生風險