diff --git a/pom.xml b/pom.xml
index 3bb33fe..1e698c9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -87,7 +87,7 @@
         <plugin.checkstyle>3.2.1</plugin.checkstyle>
             <dependency.checkstyle>9.3</dependency.checkstyle>
         <plugin.jacoco>0.8.10</plugin.jacoco>
-        <plugin.pmd>3.20.0</plugin.pmd>
+        <plugin.pmd>3.21.0</plugin.pmd>
             <dependency.pmd>6.55.0</dependency.pmd>
         <plugin.spotbugs>4.7.3.5</plugin.spotbugs>
             <dependency.spotbugs>4.7.3</dependency.spotbugs>