diff --git a/pom.xml b/pom.xml
index e17d9597..cd9836b0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -98,7 +98,7 @@
 			<groupId>org.jenkins-ci.main</groupId>
 			<artifactId>maven-plugin</artifactId>
 			<!-- 3.3 and earlier vulnerable: https://www.jenkins.io/security/advisory/2019-07-31/ -->
-			<version>3.4</version>
+			<version>3.21</version>
 			<exclusions>
 				<exclusion>
 					<groupId>org.apache.commons</groupId>