diff --git a/pom.xml b/pom.xml
index a1279cef..32664040 100644
--- a/pom.xml
+++ b/pom.xml
@@ -948,7 +948,7 @@
             <properties>
                 <asciidoctor.maven.plugin.version>2.2.2</asciidoctor.maven.plugin.version>
                 <asciidoctorj.version>2.5.6</asciidoctorj.version>
-                <asciidoctorj.diagram.version>2.2.3</asciidoctorj.diagram.version>
+                <asciidoctorj.diagram.version>2.3.1</asciidoctorj.diagram.version>
                 <jruby.version>9.3.4.0</jruby.version>
             </properties>