diff --git a/docs/build.gradle b/docs/build.gradle
index 3b92fed9..7bef9142 100644
--- a/docs/build.gradle
+++ b/docs/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     dependencies {
         classpath 'org.asciidoctor:asciidoctor-gradle-plugin:1.6.1'
         classpath 'org.asciidoctor:asciidoctorj-epub3:2.1.3'
-        classpath 'org.asciidoctor:asciidoctorj-pdf:2.3.18'
+        classpath 'org.asciidoctor:asciidoctorj-pdf:2.3.19'
     }
 }