diff --git a/api/pom.xml b/api/pom.xml
index c5e8a0d..87486e0 100644
--- a/api/pom.xml
+++ b/api/pom.xml
@@ -103,7 +103,7 @@
             </resource>
         </resources>
         <plugins>
-            <!-- Sets minimal Maven version to 3.5.4 -->
+            <!-- Sets minimal Maven version -->
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-enforcer-plugin</artifactId>
@@ -117,8 +117,7 @@
                         <configuration>
                             <rules>
                                 <requireMavenVersion>
-                                    <version>3.5.4</version>
-                                    <message>You need Maven 3.5.4 or higher</message>
+                                    <version>3.6.0</version>
                                 </requireMavenVersion>
                             </rules>
                         </configuration>
@@ -239,13 +238,14 @@
                         <configuration>
                             <source>11</source>
                             <additionalJOption>-Xdoclint:none</additionalJOption>
+                            <quiet>true</quiet>
                             <description>Jakarta Expression Language API documentation</description>
                             <doctitle>Jakarta Expression Language API documentation</doctitle>
                             <windowtitle>Jakarta Expression Language API documentation</windowtitle>
                             <header><![CDATA[<br>Jakarta Expression Language API v${project.version}]]></header>
                             <bottom><![CDATA[
 Comments to: <a href="mailto:el-dev@eclipse.org">el-dev@eclipse.org</a>.<br>
-Copyright &#169; 2018, 2020 Eclipse Foundation. All rights reserved.<br>
+Copyright &#169; 2018, 2021 Eclipse Foundation. All rights reserved.<br>
 Use is subject to <a href="{@docRoot}/doc-files/EFSL.html" target="_top">license terms</a>.]]>
                             </bottom>
                             <docfilessubdirs>true</docfilessubdirs>
diff --git a/impl/pom.xml b/impl/pom.xml
index bc4daa0..92842ba 100644
--- a/impl/pom.xml
+++ b/impl/pom.xml
@@ -82,7 +82,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.13.1</version>
+            <version>4.13.2</version>
             <scope>test</scope>
         </dependency>
     </dependencies>
@@ -106,11 +106,11 @@
             </resource>
         </resources>
         <plugins>
-            <!-- Sets minimal Maven version to 3.5.4 -->
+            <!-- Sets minimal Maven version -->
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-enforcer-plugin</artifactId>
-                <version>3.0.0-M3</version>
+                <version>3.0.0</version>
                 <executions>
                     <execution>
                         <id>enforce-maven</id>
@@ -120,8 +120,7 @@
                         <configuration>
                             <rules>
                                 <requireMavenVersion>
-                                    <version>3.5.4</version>
-                                    <message>You need Maven 3.5.4 or higher</message>
+                                    <version>3.6.0</version>
                                 </requireMavenVersion>
                             </rules>
                         </configuration>
@@ -135,7 +134,7 @@
             <plugin>
                 <groupId>org.apache.felix</groupId>
                 <artifactId>maven-bundle-plugin</artifactId>
-                <version>5.1.1</version>
+                <version>5.1.2</version>
                 <configuration>
                     <instructions>
                         <Bundle-SymbolicName>org.glassfish.jakarta.el</Bundle-SymbolicName>
@@ -190,7 +189,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-javadoc-plugin</artifactId>
-                <version>3.2.0</version>
+                <version>3.3.1</version>
                 <executions>
                     <execution>
                         <id>attach-javadocs</id>
@@ -200,6 +199,7 @@
                         <configuration>
                             <source>11</source>
                             <additionalJOption>-Xdoclint:none</additionalJOption>
+                            <quiet>true</quiet>
                             <groups>
                                 <group>
                                     <title>Jakarta Expression Language ${project.version} Implementation</title>
@@ -208,7 +208,7 @@
                             </groups>
                             <bottom><![CDATA[
 Comments to: <a href="mailto:el-dev@eclipse.org">el-dev@eclipse.org</a>.<br>
-Copyright &#169; 2018, 2020 Eclipse Foundation. All rights reserved.<br>
+Copyright &#169; 2018, 2021 Eclipse Foundation. All rights reserved.<br>
 Use is subject to <a href="http://www.eclipse.org/legal/epl-2.0" target="_top">license terms</a>.]]>
                             </bottom>
                         </configuration>
diff --git a/pom.xml b/pom.xml
index d2cd9bc..6e35168 100644
--- a/pom.xml
+++ b/pom.xml
@@ -44,7 +44,7 @@
 
     <build>
         <plugins>
-            <!-- Sets minimal Maven version to 3.5.4 -->
+            <!-- Sets minimal Maven version -->
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-enforcer-plugin</artifactId>
@@ -58,7 +58,7 @@
                         <configuration>
                             <rules>
                                 <requireMavenVersion>
-                                    <version>3.5.4</version>
+                                    <version>3.6.0</version>
                                 </requireMavenVersion>
                             </rules>
                         </configuration>
diff --git a/spec/pom.xml b/spec/pom.xml
index fc97473..3c031e4 100644
--- a/spec/pom.xml
+++ b/spec/pom.xml
@@ -82,10 +82,9 @@
     <properties>
         <site.output.dir>${project.build.directory}/staging</site.output.dir>
         <maven.site.skip>true</maven.site.skip>
-        <asciidoctor.maven.plugin.version>2.0.0-RC.1</asciidoctor.maven.plugin.version>
-        <asciidoctorj.version>2.4.0</asciidoctorj.version>
-        <asciidoctorj.pdf.version>1.5.3</asciidoctorj.pdf.version>
-        <jruby.version>9.2.13.0</jruby.version>
+        <asciidoctorj.version>2.5.2</asciidoctorj.version>
+        <asciidoctorj.pdf.version>1.6.0</asciidoctorj.pdf.version>
+        <jruby.version>9.3.2.0</jruby.version>
         <!-- status: DRAFT, BETA, etc., or blank for final -->
         <status>DRAFT</status>
         <maven.build.timestamp.format>MMMM dd, yyyy</maven.build.timestamp.format>
@@ -95,7 +94,7 @@
     <build>
         <defaultGoal>package</defaultGoal>
         <plugins>
-            <!-- Sets minimal Maven version to 3.5.4 and Java version to 11 -->
+            <!-- Sets minimal Maven version and Java version-->
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-enforcer-plugin</artifactId>
@@ -109,12 +108,10 @@
                         <configuration>
                             <rules>
                                 <requireMavenVersion>
-                                    <version>3.5.4</version>
-                                    <message>You need Maven 3.5.4 or higher</message>
+                                    <version>3.6.0</version>
                                 </requireMavenVersion>
                                 <requireJavaVersion>
                                     <version>11</version>
-                                    <message>You need Java 11 or higher</message>
                                 </requireJavaVersion>
                             </rules>
                         </configuration>
@@ -145,7 +142,7 @@
             <plugin>
                 <groupId>org.asciidoctor</groupId>
                 <artifactId>asciidoctor-maven-plugin</artifactId>
-                <version>${asciidoctor.maven.plugin.version}</version>
+                <version>2.2.1</version>
                 <dependencies>
                     <dependency>
                         <groupId>org.jruby</groupId>
@@ -172,8 +169,11 @@
                         </goals>
                         <configuration>
                             <backend>html5</backend>
+                            <sourceDirectory>${basedir}/src/main/asciidoc</sourceDirectory>
                             <outputFile>${project.build.directory}/generated-docs/jakarta-expression-language-spec-${project.version}.html</outputFile>
                             <attributes>
+                                <source-highlighter>coderay</source-highlighter>
+                                <imagesdir>images</imagesdir>
                                 <doctype>book</doctype>
                                 <status>${status}</status>
                                 <data-uri />
@@ -195,8 +195,11 @@
                         </goals>
                         <configuration>
                             <backend>pdf</backend>
+                            <sourceDirectory>${basedir}/src/main/asciidoc</sourceDirectory>
                             <outputFile>${project.build.directory}/generated-docs/jakarta-expression-language-spec-${project.version}.pdf</outputFile>
                             <attributes>
+                                <source-highlighter>coderay</source-highlighter>
+                                <imagesdir>images</imagesdir>
                                 <pdf-stylesdir>${project.basedir}/src/main/theme</pdf-stylesdir>
                                 <pdf-style>jakartaee</pdf-style>
                                 <doctype>book</doctype>
@@ -217,7 +220,6 @@
                 </executions>
                 <configuration>
                     <sourceDocumentName>expression-language-spec.adoc</sourceDocumentName>
-                    <sourceHighlighter>coderay</sourceHighlighter>
                     <attributes>
                         <revnumber>${project.version}</revnumber>
                         <revremark>${status}</revremark>