diff --git a/pom.xml b/pom.xml
index 5a1bf0b..32b953f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -138,7 +138,7 @@
         <dependency>
             <groupId>com.thoughtworks.xstream</groupId>
             <artifactId>xstream</artifactId>
-            <version>1.4.18</version>
+            <version>1.4.21</version>
         </dependency>
     </dependencies>