diff --git a/books/free-programming-books-id.md b/books/free-programming-books-id.md
index e17ae344d..040ee89eb 100644
--- a/books/free-programming-books-id.md
+++ b/books/free-programming-books-id.md
@@ -110,7 +110,7 @@
 
 ### Pemrograman Kompetitif
 
-* [Pemrograman Kompetitif Dasar](https://osn.toki.id/#materi-algo) - William Gozali & Alham Fikri Aji (PDF)
+* [Pemrograman Kompetitif Dasar](https://ksn.toki.id/data/pemrograman-kompetitif-dasar.pdf) - William Gozali & Alham Fikri Aji (PDF)
 
 
 ### PHP