diff --git a/geoserver/src/pom.xml b/geoserver/src/pom.xml
index 5fc2d770..5fa501e4 100644
--- a/geoserver/src/pom.xml
+++ b/geoserver/src/pom.xml
@@ -1168,7 +1168,7 @@
     <dependency>
       <groupId>com.thoughtworks.xstream</groupId>
       <artifactId>xstream</artifactId>
-      <version>1.4.11.1</version>
+      <version>1.4.18</version>
     </dependency>
     <dependency>
       <groupId>com.h2database</groupId>