diff --git a/build.gradle b/build.gradle
index a1225240bb..e743ddc13b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -922,17 +922,16 @@ asciidoctor {
 		}
 	}
 	options doctype: 'book', eruby: 'erubis'
+
 	attributes 'docinfo': 'shared',
-		// use provided stylesheet
 		stylesdir: "css/",
 		stylesheet: 'spring.css',
 		'linkcss': true,
 		'icons': 'font',
 		'sectanchors': '',
-		// use provided highlighter
 		'source-highlighter=highlight.js',
 		'highlightjsdir=js/highlight',
-		'highlightjs-theme=atom-one-dark-reasonable',
+		'highlightjs-theme': 'github',
 		'idprefix': '',
 		'idseparator': '-',
 		'spring-version': project.version,
diff --git a/src/reference/asciidoc/index-header.adoc b/src/reference/asciidoc/index-header.adoc
index c680996659..80f175eabb 100644
--- a/src/reference/asciidoc/index-header.adoc
+++ b/src/reference/asciidoc/index-header.adoc
@@ -6,7 +6,7 @@ ifdef::backend-html5[]
 *{project-version}*
 endif::[]
 
-(C) 2009 - 2019 Pivotal Software, Inc.
+(C) 2009 - 2020 Pivotal Software, Inc.
 All rights reserved.
 
 Copies of this document may be made for your own use and for distribution to others, provided that you do not charge any fee for such copies and further provided that each copy contains this Copyright Notice, whether distributed in print or electronically.