diff --git a/pom.xml b/pom.xml
index a5e17b2..0e6ee67 100644
--- a/pom.xml
+++ b/pom.xml
@@ -38,7 +38,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-pmd-plugin</artifactId>
-                <version>3.20.0</version>
+                <version>3.21.0</version>
                 <configuration>
                     <targetJdk>11</targetJdk>
                     <rulesets>