diff --git a/pom.xml b/pom.xml
index 2e14162..d4be93a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -200,7 +200,7 @@
 		<dependency>
 			<groupId>com.thoughtworks.xstream</groupId>
 			<artifactId>xstream</artifactId>
-			<version>1.4.7</version>
+			<version>1.4.21</version>
 			<scope>compile</scope>
 		</dependency>