diff --git a/src/epub/content.opf b/src/epub/content.opf
index 2112025..13a4940 100644
--- a/src/epub/content.opf
+++ b/src/epub/content.opf
@@ -15,8 +15,8 @@
 		<meta property="file-as" refines="#type-designer">League of Moveable Type, The</meta>
 		<meta property="se:url.homepage" refines="#type-designer">https://www.theleagueofmoveabletype.com</meta>
 		<meta property="role" refines="#type-designer" scheme="marc:relators">tyd</meta>
-		<link href="http://www.idpf.org/epub/a11y/accessibility-20170105.html#wcag-aa" rel="dcterms:conformsTo"/>
-		<meta property="a11y:certifiedBy">Standard Ebooks</meta>
+		<meta id="conformance-statement" property="dcterms:conformsTo">EPUB Accessibility 1.1 - WCAG 2.2 Level AA</meta>
+		<meta property="a11y:certifiedBy" refines="#conformance-statement">Standard Ebooks</meta>
 		<meta property="schema:accessMode">textual</meta>
 		<meta property="schema:accessModeSufficient">textual</meta>
 		<meta property="schema:accessibilityFeature">readingOrder</meta>
diff --git a/src/epub/onix.xml b/src/epub/onix.xml
index c44bda7..70055b5 100644
--- a/src/epub/onix.xml
+++ b/src/epub/onix.xml
@@ -4,7 +4,7 @@
 		<Sender>
 			<SenderName>Standard Ebooks</SenderName>
 		</Sender>
-		<SentDateTime>2014-05-25T00:00:00Z</SentDateTime>
+		<SentDateTime>2024-05-01T00:00:00Z</SentDateTime>
 	</Header>
 	<Product>
 		<DescriptiveDetail>