diff --git a/doc/manual/problem-format.rst b/doc/manual/problem-format.rst
index ebbbf03355..341ddc853e 100644
--- a/doc/manual/problem-format.rst
+++ b/doc/manual/problem-format.rst
@@ -39,4 +39,4 @@ problem by uploading a zip file that contains only testcase files. Any jury
 solutions present will be automatically submitted when ``allow_submit`` is
 ``1`` and there's a team associated with the uploading user.
 
-.. _ICPC problem package specification: https://icpc.io/problem-package-format/spec/problem_package_format
+.. _ICPC problem package specification: https://icpc.io/problem-package-format/spec/legacy-icpc