diff --git a/build.sbt b/build.sbt
index 7bb4b1a..d98e4bf 100644
--- a/build.sbt
+++ b/build.sbt
@@ -6,7 +6,7 @@ name := "sbt-site"
 
 organization := "com.typesafe.sbt"
 
-version := "1.3.2"
+version := "1.3.3-SNAPSHOT"
 crossSbtVersions := List("0.13.17", "1.0.4")
 
 licenses += ("BSD 3-Clause", url("https://opensource.org/licenses/BSD-3-Clause"))
@@ -28,7 +28,8 @@ libraryDependencies ++= Seq(
   "org.foundweekends" %% "pamflet-library" % "0.7.1",
   "org.yaml"        % "snakeyaml"        % "1.13",
   "com.typesafe"    % "config"           % "1.2.1", // Last version to support Java 1.6
-  "org.asciidoctor" % "asciidoctorj"     % "1.5.4"
+  "org.asciidoctor" % "asciidoctorj"     % "1.5.4.1",
+  "org.asciidoctor" % "asciidoctorj-diagram" % "1.5.4.1"
 )
 
 addSbtPlugin("com.lightbend.paradox" % "sbt-paradox" % "0.3.2")
diff --git a/src/main/scala/com/typesafe/sbt/site/asciidoctor/AsciidoctorPlugin.scala b/src/main/scala/com/typesafe/sbt/site/asciidoctor/AsciidoctorPlugin.scala
index 381b05b..6ff9f7d 100644
--- a/src/main/scala/com/typesafe/sbt/site/asciidoctor/AsciidoctorPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/site/asciidoctor/AsciidoctorPlugin.scala
@@ -43,6 +43,7 @@ object AsciidoctorPlugin extends AutoPlugin {
     val oldContextClassLoader = Thread.currentThread().getContextClassLoader
     Thread.currentThread().setContextClassLoader(this.getClass.getClassLoader)
     val asciidoctor = Factory.create()
+    asciidoctor.requireLibrary("asciidoctor-diagram")
     if (!output.exists) output.mkdirs()
     val options = new Options
     options.setToDir(output.getAbsolutePath)
diff --git a/src/sbt-test/asciidoctor/can-use-asciidoctor/build.sbt b/src/sbt-test/asciidoctor/can-use-asciidoctor/build.sbt
index 6ec3fd6..02f2b13 100644
--- a/src/sbt-test/asciidoctor/can-use-asciidoctor/build.sbt
+++ b/src/sbt-test/asciidoctor/can-use-asciidoctor/build.sbt
@@ -13,6 +13,8 @@ TaskKey[Unit]("checkContent") := {
   val dest = (target in makeSite).value / (siteSubdirName in Asciidoctor).value
   val index = dest / "index.html"
   assert(index.exists, s"${index.getAbsolutePath} did not exist")
+  val diagram = dest / "asciidoctor-diagram-process.png"
+  assert(diagram.exists, s"${diagram.getAbsolutePath} did not exist")
   val content = IO.readLines(index)
   assert(content.exists(_.contains("sbt")), s"Did not find expected content in:\n${content.mkString("\n")}")
 }
diff --git a/src/sbt-test/asciidoctor/can-use-asciidoctor/src/asciidoctor/index.adoc b/src/sbt-test/asciidoctor/can-use-asciidoctor/src/asciidoctor/index.adoc
index 1cc3dbe..97376e1 100644
--- a/src/sbt-test/asciidoctor/can-use-asciidoctor/src/asciidoctor/index.adoc
+++ b/src/sbt-test/asciidoctor/can-use-asciidoctor/src/asciidoctor/index.adoc
@@ -13,3 +13,23 @@ This is passed from the sbt build: {project-version}
 
 [source,ruby]
 puts "Hello, World!"
+
+[ditaa,asciidoctor-diagram-process]
+....
+                   +-------------+
+                   | Asciidoctor |-------+
+                   |   diagram   |       |
+                   +-------------+       | PNG out
+                       ^                 |
+                       | ditaa in        |
+                       |                 v
+ +--------+   +--------+----+    /---------------\
+ |        |---+ Asciidoctor +--->|               |
+ |  Text  |   +-------------+    |   Beautiful   |
+ |Document|   |   !magic!   |    |    Output     |
+ |     {d}|   |             |    |               |
+ +---+----+   +-------------+    \---------------/
+     :                                   ^
+     |          Lots of work             |
+     +-----------------------------------+
+....