diff --git a/pom.xml b/pom.xml
index 9ee871a..faa2f56 100644
--- a/pom.xml
+++ b/pom.xml
@@ -78,7 +78,7 @@
         <sign-maven-plugin.version>1.1.0</sign-maven-plugin.version>
         <nexus-staging-maven-plugin.version>1.7.0</nexus-staging-maven-plugin.version>
 
-        <flatten-maven-plugin.version>1.6.0</flatten-maven-plugin.version>
+        <flatten-maven-plugin.version>1.7.3</flatten-maven-plugin.version>
         <asciidoctor-maven-plugin.version>3.1.1</asciidoctor-maven-plugin.version>
         <docbkx-maven-plugin.version>2.0.17</docbkx-maven-plugin.version>
         <build-helper-maven-plugin.version>3.6.0</build-helper-maven-plugin.version>