diff --git a/docs/build.gradle b/docs/build.gradle
index 056cb922..64b7e040 100644
--- a/docs/build.gradle
+++ b/docs/build.gradle
@@ -3,7 +3,7 @@ buildscript {
         maven { url 'https://repo.grails.org/grails/core' }
     }
     dependencies {
-        classpath 'org.asciidoctor:asciidoctor-gradle-plugin:1.5.3'
+        classpath 'org.asciidoctor:asciidoctor-gradle-plugin:1.6.1'
         classpath 'org.asciidoctor:asciidoctorj-epub3:1.5.1'
         classpath 'org.asciidoctor:asciidoctorj-pdf:2.3.9'
     }