diff --git a/pom.xml b/pom.xml
index 67190f2..e71e3b3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -119,7 +119,7 @@ under the License.
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-xml</artifactId>
-      <version>3.0.1</version>
+      <version>4.0.0</version>
     </dependency>
     <dependency>
       <groupId>edu.ucla.cs.compilers</groupId>