diff --git a/src/epub/content.opf b/src/epub/content.opf
index 101f82e..034c797 100644
--- a/src/epub/content.opf
+++ b/src/epub/content.opf
@@ -26,7 +26,7 @@
 		<meta property="schema:accessibilityFeature">tableOfContents</meta>
 		<meta property="schema:accessibilityFeature">unlocked</meta>
 		<meta property="schema:accessibilityHazard">none</meta>
-		<meta property="schema:accessibilitySummary">This publication conforms to WCAG 2.1 Level AA.</meta>
+		<meta property="schema:accessibilitySummary">This publication conforms to WCAG 2.2 Level AA.</meta>
 		<link href="onix.xml" media-type="application/xml" properties="onix" rel="record"/>
 		<dc:title id="title">The Origin of Species</dc:title>
 		<meta property="file-as" refines="#title">Origin of Species, The</meta>