diff --git a/build.gradle b/build.gradle
index bce73b4..2b5dca3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -15,7 +15,7 @@ repositories {
 
 ext {
   asciidoctorjVersion = '2.5.12'
-  asciidoctorjPdfVersion = '2.3.13'
+  asciidoctorjPdfVersion = '2.3.15'
 }
 
 dependencies {