diff --git a/src/epub/text/dedication.xhtml b/src/epub/text/dedication.xhtml
index 37cf3c1..df60b46 100644
--- a/src/epub/text/dedication.xhtml
+++ b/src/epub/text/dedication.xhtml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops" epub:prefix="z3998: http://www.daisy.org/z3998/2012/vocab/structure/, se: https://standardebooks.org/vocab/1.0" xml:lang="en-US">
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops" epub:prefix="z3998: http://www.daisy.org/z3998/2012/vocab/structure/, se: https://standardebooks.org/vocab/1.0" xml:lang="en-GB">
 	<head>
 		<title>Dedication</title>
 		<link href="../css/core.css" rel="stylesheet" type="text/css"/>
diff --git a/src/epub/text/epigraph.xhtml b/src/epub/text/epigraph.xhtml
index 2a9b142..e5db075 100644
--- a/src/epub/text/epigraph.xhtml
+++ b/src/epub/text/epigraph.xhtml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops" epub:prefix="z3998: http://www.daisy.org/z3998/2012/vocab/structure/, se: https://standardebooks.org/vocab/1.0" xml:lang="en-US">
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops" epub:prefix="z3998: http://www.daisy.org/z3998/2012/vocab/structure/, se: https://standardebooks.org/vocab/1.0" xml:lang="en-GB">
 	<head>
 		<title>Epigraph</title>
 		<link href="../css/core.css" rel="stylesheet" type="text/css"/>
