diff --git a/asciidoctor-maven-commons/src/main/java/org/asciidoctor/maven/site/SiteConversionConfigurationParser.java b/asciidoctor-maven-commons/src/main/java/org/asciidoctor/maven/site/SiteConversionConfigurationParser.java
index f6ae9e63..845fb261 100644
--- a/asciidoctor-maven-commons/src/main/java/org/asciidoctor/maven/site/SiteConversionConfigurationParser.java
+++ b/asciidoctor-maven-commons/src/main/java/org/asciidoctor/maven/site/SiteConversionConfigurationParser.java
@@ -1,6 +1,7 @@
 package org.asciidoctor.maven.site;
 
 import org.apache.maven.project.MavenProject;
+import org.asciidoctor.Attributes;
 import org.asciidoctor.AttributesBuilder;
 import org.asciidoctor.Options;
 import org.asciidoctor.OptionsBuilder;
@@ -9,7 +10,10 @@
 import org.codehaus.plexus.util.xml.Xpp3Dom;
 
 import java.io.File;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
@@ -29,17 +33,21 @@ public SiteConversionConfiguration processAsciiDocConfig(Xpp3Dom siteConfig,
 
         AsciidoctorHelper.addProperties(project.getProperties(), presetAttributes);
 
-        final Xpp3Dom siteConfiguration = Optional.ofNullable(siteConfig)
-                .map(sc -> sc.getChild("asciidoc"))
-                .orElse(null);
+        final Attributes attributes = presetAttributes.build();
 
-        if (siteConfiguration == null) {
-            final OptionsBuilder options = presetOptions.attributes(presetAttributes.build());
-            return new SiteConversionConfiguration(options.build(), Collections.emptyList());
+        if (siteConfig == null) {
+            final Options options = presetOptions.attributes(attributes).build();
+            return new SiteConversionConfiguration(options, Collections.emptyList());
+        }
+
+        final Xpp3Dom asciidocConfig = siteConfig.getChild("asciidoc");
+        if (asciidocConfig == null) {
+            final Options options = presetOptions.attributes(attributes).build();
+            return new SiteConversionConfiguration(options, Collections.emptyList());
         }
 
         final List<String> gemsToRequire = new ArrayList<>();
-        for (Xpp3Dom asciidocOpt : siteConfiguration.getChildren()) {
+        for (Xpp3Dom asciidocOpt : asciidocConfig.getChildren()) {
             String optName = asciidocOpt.getName();
 
             if ("requires".equals(optName)) {
@@ -79,12 +87,12 @@ public SiteConversionConfiguration processAsciiDocConfig(Xpp3Dom siteConfig,
             }
         }
 
-        final Options options = presetOptions.attributes(presetAttributes.build()).build();
+        final Options options = presetOptions.attributes(attributes).build();
         return new SiteConversionConfiguration(options, gemsToRequire);
     }
 
     private File resolveProjectDir(MavenProject project, String path) {
         final File filePath = new File(path);
-        return !filePath.isAbsolute() ? new File(project.getBasedir(), filePath.toString()): filePath;
+        return !filePath.isAbsolute() ? new File(project.getBasedir(), filePath.toString()) : filePath;
     }
 }
diff --git a/asciidoctor-maven-plugin/src/test/java/org/asciidoctor/maven/test/processors/ChangeAttributeValuePreprocessor.java b/asciidoctor-maven-plugin/src/test/java/org/asciidoctor/maven/test/processors/ChangeAttributeValuePreprocessor.java
index 636d9ab7..4e8ed118 100644
--- a/asciidoctor-maven-plugin/src/test/java/org/asciidoctor/maven/test/processors/ChangeAttributeValuePreprocessor.java
+++ b/asciidoctor-maven-plugin/src/test/java/org/asciidoctor/maven/test/processors/ChangeAttributeValuePreprocessor.java
@@ -3,6 +3,7 @@
 import org.asciidoctor.ast.Document;
 import org.asciidoctor.extension.Preprocessor;
 import org.asciidoctor.extension.PreprocessorReader;
+import org.asciidoctor.extension.Reader;
 
 import java.util.Map;
 
@@ -16,9 +17,10 @@ public ChangeAttributeValuePreprocessor(Map<String, Object> config) {
     }
 
     @Override
-    public void process(Document document, PreprocessorReader reader) {
+    public Reader process(Document document, PreprocessorReader reader) {
         System.out.println("Processing " + this.getClass().getSimpleName());
         System.out.println("Processing: blocks found: " + document.getBlocks().size());
         document.getAttributes().put("author", AUTHOR_NAME);
+        return reader;
     }
 }
diff --git a/asciidoctor-maven-plugin/src/test/java/org/asciidoctor/maven/test/processors/FailingPreprocessor.java b/asciidoctor-maven-plugin/src/test/java/org/asciidoctor/maven/test/processors/FailingPreprocessor.java
index 2a14aa36..93638e81 100644
--- a/asciidoctor-maven-plugin/src/test/java/org/asciidoctor/maven/test/processors/FailingPreprocessor.java
+++ b/asciidoctor-maven-plugin/src/test/java/org/asciidoctor/maven/test/processors/FailingPreprocessor.java
@@ -3,6 +3,7 @@
 import org.asciidoctor.ast.Document;
 import org.asciidoctor.extension.Preprocessor;
 import org.asciidoctor.extension.PreprocessorReader;
+import org.asciidoctor.extension.Reader;
 
 import java.util.Map;
 
@@ -14,7 +15,7 @@ public FailingPreprocessor(Map<String, Object> config) {
     }
 
     @Override
-    public void process(Document document, PreprocessorReader reader) {
+    public Reader process(Document document, PreprocessorReader reader) {
         System.out.println("Processing " + this.getClass().getSimpleName());
         System.out.println("Processing: blocks found: " + document.getBlocks().size());
         throw new RuntimeException("That's all folks");
diff --git a/asciidoctor-maven-plugin/src/test/java/org/asciidoctor/maven/test/processors/ManpageInlineMacroProcessor.java b/asciidoctor-maven-plugin/src/test/java/org/asciidoctor/maven/test/processors/ManpageInlineMacroProcessor.java
index 0600ffb3..d05c95d7 100644
--- a/asciidoctor-maven-plugin/src/test/java/org/asciidoctor/maven/test/processors/ManpageInlineMacroProcessor.java
+++ b/asciidoctor-maven-plugin/src/test/java/org/asciidoctor/maven/test/processors/ManpageInlineMacroProcessor.java
@@ -1,6 +1,7 @@
 package org.asciidoctor.maven.test.processors;
 
-import org.asciidoctor.ast.ContentNode;
+import org.asciidoctor.ast.PhraseNode;
+import org.asciidoctor.ast.StructuralNode;
 import org.asciidoctor.extension.InlineMacroProcessor;
 
 import java.util.HashMap;
@@ -13,11 +14,10 @@ public ManpageInlineMacroProcessor(String macroName) {
     }
 
     @Override
-    public String process(ContentNode parent, String target, Map<String, Object> attributes) {
-
+    public PhraseNode process(StructuralNode parent, String target, Map<String, Object> attributes) {
         final Map<String, Object> options = new HashMap<>();
         options.put("type", ":link");
         options.put("target", target + ".html");
-        return createPhraseNode(parent, "anchor", target, attributes, options).convert();
+        return createPhraseNode(parent, "anchor", target, attributes, options);
     }
 }
diff --git a/asciidoctor-maven-plugin/src/test/java/org/asciidoctor/maven/test/processors/UriIncludeProcessor.java b/asciidoctor-maven-plugin/src/test/java/org/asciidoctor/maven/test/processors/UriIncludeProcessor.java
index 644d2919..91504007 100644
--- a/asciidoctor-maven-plugin/src/test/java/org/asciidoctor/maven/test/processors/UriIncludeProcessor.java
+++ b/asciidoctor-maven-plugin/src/test/java/org/asciidoctor/maven/test/processors/UriIncludeProcessor.java
@@ -28,7 +28,7 @@ public void process(Document document, PreprocessorReader reader, String target,
                         Map<String, Object> attributes) {
         System.out.println("Processing " + this.getClass().getSimpleName());
         final String content = readContent(target);
-        reader.push_include(content, target, target, 1, attributes);
+        reader.pushInclude(content, target, target, 1, attributes);
     }
 
     private String readContent(String target) {
diff --git a/pom.xml b/pom.xml
index 4077bd6a..92c1b61f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -77,7 +77,7 @@
         <project.java.version>11</project.java.version>
         <project.execution.environment>JavaSE-1.8</project.execution.environment>
         <asciidoctorj.version>2.5.10</asciidoctorj.version>
-        <jruby.version>9.4.5.0</jruby.version>
+        <jruby.version>9.4.2.0</jruby.version>
         <maven.project.version>3.9.1</maven.project.version>
         <maven.jacoco.plugin.version>0.8.11</maven.jacoco.plugin.version>
     </properties>