diff --git a/wicket-user-guide/pom.xml b/wicket-user-guide/pom.xml
index 61bb9614941..4d74b088536 100644
--- a/wicket-user-guide/pom.xml
+++ b/wicket-user-guide/pom.xml
@@ -31,7 +31,7 @@
 	</description>
 
 	<properties>
-		<asciidoctor-maven-plugin.version>2.2.4</asciidoctor-maven-plugin.version>
+		<asciidoctor-maven-plugin.version>2.2.3</asciidoctor-maven-plugin.version>
 		<japicmp.skip>true</japicmp.skip>
 	</properties>
 
@@ -151,7 +151,7 @@
 						<dependency>
 							<groupId>org.asciidoctor</groupId>
 							<artifactId>asciidoctorj-pdf</artifactId>
-							<version>2.3.9</version>
+							<version>2.3.4</version>
 						</dependency>
 						<dependency>
 							<groupId>org.asciidoctor</groupId>