diff --git a/README.md b/README.md
index bf5ce76a..bd7f65da 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ Follow me:  [https://github.com/QingdaoU/OnlineJudgeDeploy/tree/2.0](https://git
 
 ## Documents
 
-[http://docs.onlinejudge.me/](https://docs.onlinejudge.me/)
+[https://docs.onlinejudge.me/](https://docs.onlinejudge.me/)
 
 ## Screenshots