diff --git a/docs/build.gradle b/docs/build.gradle
index 42e182f538..c0f06c92a5 100644
--- a/docs/build.gradle
+++ b/docs/build.gradle
@@ -7,7 +7,7 @@ plugins {
 }
 
 dependencies {
-    asciidoctor 'org.asciidoctor:asciidoctorj-diagram:2.0.5'
+    asciidoctor 'org.asciidoctor:asciidoctorj-diagram:2.1.1'
 }
 
 task cleanUserGuide(type: Delete) {