diff --git a/tests/sample-documents/docbook4xml-simple.xml b/tests/sample-documents/docbook4xml-simple.xml
index b24cfff..d0344fc 100644
--- a/tests/sample-documents/docbook4xml-simple.xml
+++ b/tests/sample-documents/docbook4xml-simple.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" standalone="no"?>
-<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
+<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
                          "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
 <article>
   <articleinfo>