diff --git a/spec/pom.xml b/spec/pom.xml
index 4ffc9099..0548b5c2 100644
--- a/spec/pom.xml
+++ b/spec/pom.xml
@@ -25,7 +25,7 @@
 	<properties>
 		<asciidoctor-maven.version>3.0.0</asciidoctor-maven.version>
 		<asciidoctorj.version>2.5.11</asciidoctorj.version>
-		<asciidoctorj-pdf.version>2.3.12</asciidoctorj-pdf.version>
+		<asciidoctorj-pdf.version>2.3.13</asciidoctorj-pdf.version>
 		<!-- asl2 for non-final releases, or final for EFSL -->
 		<license-file>asl2</license-file>
 		<!-- Draft for non-final releases, or Final for spec release -->