diff --git a/server/pom.xml b/server/pom.xml
index e4e67cf5..a0f1346e 100644
--- a/server/pom.xml
+++ b/server/pom.xml
@@ -149,7 +149,7 @@
         <dependency>
             <groupId>com.thoughtworks.xstream</groupId>
             <artifactId>xstream</artifactId>
-            <version>1.4.17</version>
+            <version>1.4.18</version>
         </dependency>
         <dependency>
             <groupId>com.googlecode.concurrentlinkedhashmap</groupId>