diff --git a/buildSrc/src/main/java/io/spring/gradle/convention/AsciidoctorConventionPlugin.java b/buildSrc/src/main/java/io/spring/gradle/convention/AsciidoctorConventionPlugin.java
index bfe6a28..f8c5411 100644
--- a/buildSrc/src/main/java/io/spring/gradle/convention/AsciidoctorConventionPlugin.java
+++ b/buildSrc/src/main/java/io/spring/gradle/convention/AsciidoctorConventionPlugin.java
@@ -1,22 +1,21 @@
 /*
- * Copyright 2022-present the original author or authors.
+ * Copyright 2017-present the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
- *      https://www.apache.org/licenses/LICENSE-2.0
+ *     https://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
  */
 package io.spring.gradle.convention;
 
 import java.io.File;
-import java.net.URI;
 import java.time.LocalDate;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -29,17 +28,17 @@ import org.asciidoctor.gradle.jvm.AbstractAsciidoctorTask;
 import org.asciidoctor.gradle.jvm.AsciidoctorJExtension;
 import org.asciidoctor.gradle.jvm.AsciidoctorJPlugin;
 import org.asciidoctor.gradle.jvm.AsciidoctorTask;
+import org.gradle.api.JavaVersion;
 import org.gradle.api.Plugin;
 import org.gradle.api.Project;
 import org.gradle.api.artifacts.Configuration;
-import org.gradle.api.artifacts.dsl.RepositoryHandler;
 import org.gradle.api.file.DuplicatesStrategy;
 import org.gradle.api.file.FileTree;
 import org.gradle.api.tasks.Sync;
 
 /**
  * Conventions that are applied in the presence of the {@link AsciidoctorJPlugin}.
- *
+ * <p/>
  * When the plugin is applied:
  *
  * <ul>
@@ -63,16 +62,19 @@ import org.gradle.api.tasks.Sync;
  *
  * @author Andy Wilkinson
  * @author Rob Winch
+ * @author John Blum
  */
 public class AsciidoctorConventionPlugin implements Plugin<Project> {
 
-	private static final String SPRING_ASCIIDOCTOR_EXTENSIONS_BLOCK_SWITCH_VERSION = "0.4.2.RELEASE";
+	private static final String ASCIIDOCTORJ_VERSION = "2.4.3";
+	private static final String SPRING_ASCIIDOCTOR_BACKENDS_VERSION = "0.0.5";
 	private static final String SPRING_DOC_RESOURCES_VERSION = "0.2.5";
 
-	private static final String SPRING_ASCIIDOCTOR_EXTENSION_BLOCK_SWITCH_DEPENDENCY =
-		String.format("io.spring.asciidoctor:spring-asciidoctor-extensions-block-switch:%s",
-			SPRING_ASCIIDOCTOR_EXTENSIONS_BLOCK_SWITCH_VERSION);
+	private static final String SPRING_ASCIIDOCTOR_BACKENDS_DEPENDENCY =
+		String.format("io.spring.asciidoctor.backends:spring-asciidoctor-backends:%s",
+			SPRING_ASCIIDOCTOR_BACKENDS_VERSION);
 
+	@SuppressWarnings("unused")
 	private static final String SPRING_DOC_RESOURCES_DEPENDENCY =
 		String.format("io.spring.docresources:spring-doc-resources:%s", SPRING_DOC_RESOURCES_VERSION);
 
@@ -81,19 +83,16 @@ public class AsciidoctorConventionPlugin implements Plugin<Project> {
 
 		project.getPlugins().withType(AsciidoctorJPlugin.class, asciidoctorPlugin -> {
 
-			createDefaultAsciidoctorRepository(project);
+			setAsciidoctorJVersion(project);
 			makeAllWarningsFatal(project);
+			createAsciidoctorExtensionsConfiguration(project);
 
 			Sync unzipResources = createUnzipDocumentationResourcesTask(project);
 
 			project.getTasks().withType(AbstractAsciidoctorTask.class, asciidoctorTask -> {
 
 				asciidoctorTask.dependsOn(unzipResources);
-				configureAttributes(project, asciidoctorTask);
-				configureExtensions(project, asciidoctorTask);
-				configureOptions(asciidoctorTask);
-				asciidoctorTask.baseDirFollowsSourceDir();
-				asciidoctorTask.useIntermediateWorkDir();
+				configureAsciidoctorTask(project, asciidoctorTask);
 
 				asciidoctorTask.resources(resourcesSpec -> {
 					resourcesSpec.setDuplicatesStrategy(DuplicatesStrategy.INCLUDE);
@@ -105,45 +104,52 @@ public class AsciidoctorConventionPlugin implements Plugin<Project> {
 						// resourcesSrcDirSpec.include("images/**");
 					});
 				});
-
-				if (asciidoctorTask instanceof AsciidoctorTask) {
-					configureHtmlOnlyAttributes(project, asciidoctorTask);
-				}
 			});
 		});
 	}
 
-	private void createDefaultAsciidoctorRepository(Project project) {
+	private void setAsciidoctorJVersion(Project project) {
+		project.getExtensions().getByType(AsciidoctorJExtension.class).setVersion(ASCIIDOCTORJ_VERSION);
+	}
 
-		project.getGradle().afterProject(it -> {
+	private void makeAllWarningsFatal(Project project) {
+		project.getExtensions().getByType(AsciidoctorJExtension.class).fatalWarnings(".*");
+	}
 
-			RepositoryHandler repositories = it.getRepositories();
+	private void createAsciidoctorExtensionsConfiguration(Project project) {
 
-			if (repositories.isEmpty()) {
-				repositories.mavenCentral();
-				repositories.maven(repo -> repo.setUrl(URI.create("https://repo.spring.io/release")));
-			}
+		project.getConfigurations().create("asciidoctorExtensions", configuration -> {
+
+			project.getConfigurations()
+				.matching(it -> "dependencyManagement".equals(it.getName()))
+				.all(configuration::extendsFrom);
+
+			configuration.getDependencies()
+				.add(project.getDependencies().create(SPRING_ASCIIDOCTOR_BACKENDS_DEPENDENCY));
+
+			// TODO: Why is the asiidoctorj-pdf dependency needed?
+			configuration.getDependencies()
+				.add(project.getDependencies().create("org.asciidoctor:asciidoctorj-pdf:1.5.3"));
 		});
 	}
 
 	/**
-	 * Requests the base Spring Documentation Resources from {@literal https://repo.spring.io/release} and uses it
-	 * to format and render documentation.
+	 * Requests the base Spring Documentation Resources from {@literal Maven Central} and uses it to format
+	 * and render documentation.
 	 *
 	 * @param project {@literal this} Gradle {@link Project}.
-	 * @return a {@link Sync} task used to copy the Spring Documentation Resources to a build directory
+	 * @return a {@link Sync} task that copies Spring Documentation Resources to the build directory
 	 * used to generate documentation.
-	 * @see <a href="https://repo.spring.io/ui/native/release/io/spring/docresources/spring-doc-resources">spring-doc-resources</a>
 	 * @see org.gradle.api.tasks.Sync
 	 * @see org.gradle.api.Project
 	 */
 	@SuppressWarnings("all")
 	private Sync createUnzipDocumentationResourcesTask(Project project) {
 
-		Configuration documentationResources = project.getConfigurations().maybeCreate("documentationResources");
+		Configuration documentationResources = project.getConfigurations().create("documentationResources");
 
 		documentationResources.getDependencies()
-			.add(project.getDependencies().create(SPRING_DOC_RESOURCES_DEPENDENCY));
+			.add(project.getDependencies().create(SPRING_ASCIIDOCTOR_BACKENDS_DEPENDENCY));
 
 		Sync unzipResources = project.getTasks().create("unzipDocumentationResources", Sync.class, sync -> {
 
@@ -166,56 +172,66 @@ public class AsciidoctorConventionPlugin implements Plugin<Project> {
 		return unzipResources;
 	}
 
-	@SuppressWarnings("unused")
+	private void configureAsciidoctorTask(Project project, AbstractAsciidoctorTask asciidoctorTask) {
+
+		asciidoctorTask.baseDirFollowsSourceDir();
+		asciidoctorTask.configurations("asciidoctorExtensions");
+		//asciidoctorTask.useIntermediateWorkDir();
+
+		configureAttributes(project, asciidoctorTask);
+		configureForkOptions(asciidoctorTask);
+		configureOptions(asciidoctorTask);
+
+		if (asciidoctorTask instanceof AsciidoctorTask) {
+			boolean pdf = asciidoctorTask.getName().toLowerCase().contains("pdf");
+			String backend = pdf ? "spring-pdf" : "spring-html";
+			((AsciidoctorTask) asciidoctorTask).outputOptions((outputOptions) -> outputOptions.backends(backend));
+			configureHtmlOnlyAttributes(asciidoctorTask);
+		}
+	}
+
 	private void configureAttributes(Project project, AbstractAsciidoctorTask asciidoctorTask) {
 
 		Map<String, Object> attributes = new HashMap<>();
 
 		attributes.put("attribute-missing", "warn");
-		attributes.put("icons", "font");
+		attributes.put("docinfo", "shared");
 		attributes.put("idprefix", "");
 		attributes.put("idseparator", "-");
-		attributes.put("docinfo", "shared");
 		attributes.put("sectanchors", "");
 		attributes.put("sectnums", "");
 		attributes.put("today-year", LocalDate.now().getYear());
 
+		Object version = project.getVersion();
+
+		if (version != null && !Project.DEFAULT_VERSION.equals(version)) {
+			attributes.put("revnumber", version);
+		}
+
 		asciidoctorTask.attributes(attributes);
 	}
 
-	private void configureExtensions(Project project, AbstractAsciidoctorTask asciidoctorTask) {
-
-		Configuration extensionsConfiguration = project.getConfigurations().maybeCreate("asciidoctorExtensions");
-
-		extensionsConfiguration.defaultDependencies(dependencies -> dependencies.add(project.getDependencies()
-			.create(SPRING_ASCIIDOCTOR_EXTENSION_BLOCK_SWITCH_DEPENDENCY)));
-
-		asciidoctorTask.configurations(extensionsConfiguration);
+	private void configureForkOptions(AbstractAsciidoctorTask asciidoctorTask) {
+		if (JavaVersion.current().isCompatibleWith(JavaVersion.VERSION_16)) {
+			asciidoctorTask.forkOptions(options -> options.jvmArgs(
+				"--add-opens", "java.base/sun.nio.ch=ALL-UNNAMED",
+				"--add-opens", "java.base/java.io=ALL-UNNAMED")
+			);
+		}
 	}
 
-	private void configureHtmlOnlyAttributes(Project project, AbstractAsciidoctorTask asciidoctorTask) {
+	private void configureHtmlOnlyAttributes(AbstractAsciidoctorTask asciidoctorTask) {
 
 		Map<String, Object> attributes = new HashMap<>();
 
-		attributes.put("source-highlighter", "highlight.js");
 		attributes.put("highlightjsdir", "js/highlight");
 		attributes.put("highlightjs-theme", "github");
-		attributes.put("linkcss", true);
+		attributes.put("source-highlighter", "highlight.js");
 		attributes.put("icons", "font");
-		attributes.put("stylesheet", "css/spring.css");
-
-		asciidoctorTask.getAttributeProviders().add(() -> {
-
-			Object version = project.getVersion();
-
-			Map<String, Object> localAttributes = new HashMap<>();
-
-			if (version != null && !Project.DEFAULT_VERSION.equals(version)) {
-				localAttributes.put("revnumber", version);
-			}
-
-			return localAttributes;
-		});
+		attributes.put("imagesdir", "./images");
+		attributes.put("linkcss", true);
+		attributes.put("stylesdir", "css/");
+		//attributes.put("stylesheet", "spring.css");
 
 		asciidoctorTask.attributes(attributes);
 	}
@@ -223,8 +239,4 @@ public class AsciidoctorConventionPlugin implements Plugin<Project> {
 	private void configureOptions(AbstractAsciidoctorTask asciidoctorTask) {
 		asciidoctorTask.options(Collections.singletonMap("doctype", "book"));
 	}
-
-	private void makeAllWarningsFatal(Project project) {
-		project.getExtensions().getByType(AsciidoctorJExtension.class).fatalWarnings(".*");
-	}
 }