diff --git a/core/Xstream/pom.xml b/core/Xstream/pom.xml
index 1e130c75a..49c49e818 100644
--- a/core/Xstream/pom.xml
+++ b/core/Xstream/pom.xml
@@ -33,7 +33,7 @@
         <dependency>
             <groupId>com.thoughtworks.xstream</groupId>
             <artifactId>xstream</artifactId>
-            <version>1.4.20</version>
+            <version>1.4.21</version>
         </dependency>
         <dependency>
             <groupId>org.netbeans.api</groupId>