diff --git a/pom.xml b/pom.xml
index 436b0d2..b74b2ad 100644
--- a/pom.xml
+++ b/pom.xml
@@ -410,7 +410,7 @@
 		<dependency>
 			<groupId>com.thoughtworks.xstream</groupId>
 			<artifactId>xstream</artifactId>
-			<version>1.4.20</version>
+			<version>1.4.21</version>
 			<scope>compile</scope>
 			<exclusions>
 				<!-- we will pull in the full xpp3 so we don't need these -->