[MPMD-364] - Upgrade to PMD 6.54.0 (#112)

diff --git a/pom.xml b/pom.xml
index f0f7a11..c17a29f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -89,7 +89,7 @@
     <doxiaVersion>1.11.1</doxiaVersion>
     <doxiaSitetoolsVersion>1.11.1</doxiaSitetoolsVersion>
     <javaVersion>8</javaVersion><!-- Because PMD 6.35.0+ requires Java 8 -->
-    <pmdVersion>6.53.0</pmdVersion>
+    <pmdVersion>6.54.0</pmdVersion>
     <slf4jVersion>1.7.36</slf4jVersion>
     <aetherVersion>1.0.0.v20140518</aetherVersion>
     <sitePluginVersion>3.12.1</sitePluginVersion>
diff --git a/src/site/apt/examples/upgrading-PMD-at-runtime.apt.vm b/src/site/apt/examples/upgrading-PMD-at-runtime.apt.vm
index 5b06d31..d55f257 100644
--- a/src/site/apt/examples/upgrading-PMD-at-runtime.apt.vm
+++ b/src/site/apt/examples/upgrading-PMD-at-runtime.apt.vm
@@ -88,6 +88,8 @@
 *--------------------------------------------------------------------------------*--------------------------------------------------*
 | <<maven-pmd-plugin>>                                                           | <<PMD>>                                          |
 *--------------------------------------------------------------------------------*--------------------------------------------------*
+| {{{https://maven.apache.org/plugins-archives/maven-pmd-plugin-3.21.0/}3.21.0}} | {{{https://pmd.github.io/pmd-6.54.0/}6.54.0}}    |
+*--------------------------------------------------------------------------------*--------------------------------------------------*
 | {{{https://maven.apache.org/plugins-archives/maven-pmd-plugin-3.20.0/}3.20.0}} | {{{https://pmd.github.io/pmd-6.53.0/}6.53.0}}    |
 *--------------------------------------------------------------------------------*--------------------------------------------------*
 | {{{https://maven.apache.org/plugins-archives/maven-pmd-plugin-3.19.0/}3.19.0}} | {{{https://pmd.github.io/pmd-6.49.0/}6.49.0}}    |
diff --git a/src/site/markdown/releasenotes.md b/src/site/markdown/releasenotes.md
index 291681a..2d7e456 100644
--- a/src/site/markdown/releasenotes.md
+++ b/src/site/markdown/releasenotes.md
@@ -33,6 +33,7 @@
 ### 👻 Maintenance
 ### 📝 Documentation updates
 ### 📦 Dependency updates
+* [MPMD-364](https://issues.apache.org/jira/browse/MPMD-364) - Upgrade to PMD 6.54.0 ([#112](https://github.com/apache/maven-pmd-plugin/pull/112)) (@adangel)
 
 ## Version 3.20.0