diff --git a/pom.xml b/pom.xml
index 8efe8ff64..d879e931c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -662,7 +662,7 @@
                                 <dependency>
                                     <groupId>com.thoughtworks.xstream</groupId>
                                     <artifactId>xstream</artifactId>
-                                    <version>1.4.20</version>
+                                    <version>1.4.21</version>
                                 </dependency>
                             </dependencies>
                         </plugin>