[MPMD-261] - Upgrade to PMD 6.4.0
diff --git a/pom.xml b/pom.xml
index 3051edc..09f646b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -92,7 +92,7 @@
     <javaVersion>1.7</javaVersion>
     <maven.compiler.source>${javaVersion}</maven.compiler.source>
     <maven.compiler.target>${javaVersion}</maven.compiler.target>
-    <pmdVersion>6.3.0</pmdVersion>
+    <pmdVersion>6.4.0</pmdVersion>
     <sitePluginVersion>3.4</sitePluginVersion>
     <projectInfoReportsPluginVersion>2.8</projectInfoReportsPluginVersion>
     <mavenPluginToolsVersion>3.5</mavenPluginToolsVersion>