diff --git a/docs/office_c2r_custom.md b/docs/office_c2r_custom.md
index 65689fb..6644e34 100644
--- a/docs/office_c2r_custom.md
+++ b/docs/office_c2r_custom.md
@@ -108,7 +108,7 @@ It will now install Office.
 
 ## Alternative Methods
 
--   [Office Tool Plus](http://otp.landian.vip/)
+-   [Office Tool Plus](https://otp.landian.vip/)
 
 ---