diff --git a/pom.xml b/pom.xml
index aa7f895..2eacdf3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -109,7 +109,7 @@
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-interpolation</artifactId>
-      <version>1.19</version>
+      <version>1.21</version>
     </dependency>
     <dependency>
       <groupId>org.sonatype.plexus</groupId>