diff --git a/gradebookng/impl/pom.xml b/gradebookng/impl/pom.xml
index 12f9111f3ff8..869b84564cec 100644
--- a/gradebookng/impl/pom.xml
+++ b/gradebookng/impl/pom.xml
@@ -86,7 +86,7 @@
         <dependency>
             <groupId>com.thoughtworks.xstream</groupId>
             <artifactId>xstream</artifactId>
-            <version>1.4.18</version>
+            <version>1.4.20</version>
         </dependency>
     </dependencies>