diff --git a/mahout/pom.xml b/mahout/pom.xml
index 7485994..2c59ecc 100644
--- a/mahout/pom.xml
+++ b/mahout/pom.xml
@@ -342,7 +342,7 @@
       <dependency>
         <groupId>com.thoughtworks.xstream</groupId>
         <artifactId>xstream</artifactId>
-        <version>1.3.1</version>
+        <version>1.4.17</version>
       </dependency>
 
       <dependency>