diff --git a/pom.xml b/pom.xml
index f8ea8e57..1205b2da 100644
--- a/pom.xml
+++ b/pom.xml
@@ -16,7 +16,7 @@
     <properties>
         <asciidoctor.maven.plugin.version>2.2.6</asciidoctor.maven.plugin.version>
         <asciidoctorj.version>2.5.1</asciidoctorj.version>
-        <asciidoctorj.diagram.version>2.3.0</asciidoctorj.diagram.version>
+        <asciidoctorj.diagram.version>2.3.1</asciidoctorj.diagram.version>
         <asciidoctorj.pdf.version>2.3.18</asciidoctorj.pdf.version>
         <jetty-maven-plugin.version>11.0.24</jetty-maven-plugin.version>
     </properties>