diff --git a/doc/reference/pom.xml b/doc/reference/pom.xml
index b2e0d1025..b27d2ead4 100644
--- a/doc/reference/pom.xml
+++ b/doc/reference/pom.xml
@@ -17,7 +17,7 @@
 
     <properties>
         <asciidoctor.maven.plugin.version>3.0.0</asciidoctor.maven.plugin.version>
-        <asciidoctorj.pdf.version>2.3.13</asciidoctorj.pdf.version>
+        <asciidoctorj.pdf.version>2.3.18</asciidoctorj.pdf.version>
         <pdf.name>cdi-tck-reference-guide.pdf</pdf.name>
         <revmajor>4</revmajor>
         <revnumber>4.1</revnumber>