diff --git a/calvalus-processing/pom.xml b/calvalus-processing/pom.xml
index a685ab7a0..5193178f6 100644
--- a/calvalus-processing/pom.xml
+++ b/calvalus-processing/pom.xml
@@ -183,7 +183,7 @@
         <dependency>
             <groupId>com.thoughtworks.xstream</groupId>
             <artifactId>xstream</artifactId>
-            <version>1.4.8</version>
+            <version>1.4.18</version>
         </dependency>
 
         <!--  BC Geo - Inventory -->
diff --git a/pom.xml b/pom.xml
index fd842b520..d4c8609a4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -352,7 +352,7 @@
             <dependency>
                 <groupId>com.thoughtworks.xstream</groupId>
                 <artifactId>xstream</artifactId>
-                <version>1.4.8</version>
+                <version>1.4.18</version>
             </dependency>
             <dependency>
                 <groupId>com.googlecode.json-simple</groupId>