diff --git a/pom.xml b/pom.xml
index e66b89b43..586f45d59 100644
--- a/pom.xml
+++ b/pom.xml
@@ -193,7 +193,7 @@
       <dependency>
         <groupId>com.thoughtworks.xstream</groupId>
         <artifactId>xstream</artifactId>
-        <version>1.4.20</version>
+        <version>1.4.21</version>
       </dependency>
       <dependency>
         <groupId>com.google.guava</groupId>