diff --git a/pom.xml b/pom.xml
index 9c53db4..b2416bd 100644
--- a/pom.xml
+++ b/pom.xml
@@ -30,7 +30,7 @@
         <dependency>
             <groupId>com.thoughtworks.xstream</groupId>
             <artifactId>xstream</artifactId>
-            <version>1.4.7</version>
+            <version>1.4.21</version>
         </dependency>
         <dependency>
             <groupId>commons-io</groupId>