diff --git a/pom.xml b/pom.xml
old mode 100755
new mode 100644
index 2b6734f55..258fb7f29
--- a/pom.xml
+++ b/pom.xml
@@ -784,7 +784,7 @@
             <dependency>
                 <groupId>com.thoughtworks.xstream</groupId>
                 <artifactId>xstream</artifactId>
-                <version>1.4.4</version>
+                <version>1.4.15</version>
             </dependency>
             <dependency>
                 <groupId>org.apache.abdera</groupId>