diff --git a/pom.xml b/pom.xml
index 9ba5297b717..d0548a5fa1a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -361,7 +361,7 @@
 			<dependency>
 				<groupId>com.thoughtworks.xstream</groupId>
 				<artifactId>xstream</artifactId>
-				<version>1.4.20</version>
+				<version>1.4.21</version>
 			</dependency>
 			<dependency>
 				<groupId>javax.mail</groupId>