diff --git a/2.1.x/spring-cloud-commons.xml b/2.1.x/spring-cloud-commons.xml
index aa7bc4eb..72223d00 100644
--- a/2.1.x/spring-cloud-commons.xml
+++ b/2.1.x/spring-cloud-commons.xml
@@ -4,7 +4,7 @@
 <book xmlns="http://docbook.org/ns/docbook" xmlns:xl="http://www.w3.org/1999/xlink" version="5.0" xml:lang="en">
 <info>
 <title>Cloud Native Applications</title>
-<date>2019-12-30</date>
+<date>2019-12-31</date>
 </info>
 <preface>
 <title></title>