diff --color -ruNp a/lib/doc/libkcapi.tmpl b/lib/doc/libkcapi.tmpl
--- a/lib/doc/libkcapi.tmpl	2023-07-29 17:47:11.011047980 +0200
+++ b/lib/doc/libkcapi.tmpl	2024-07-26 09:29:17.777668566 +0200
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V45//EN"
-	"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" []>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
+	"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
 
 <book id="libkcapi" revision="@@LIBVERSION@@">
  <bookinfo>