diff --git a/cap-04/pom.xml b/cap-04/pom.xml
index 573b628..8bb32a6 100644
--- a/cap-04/pom.xml
+++ b/cap-04/pom.xml
@@ -37,7 +37,7 @@
 		<dependency>
 			<groupId>com.thoughtworks.xstream</groupId>
 			<artifactId>xstream</artifactId>
-			<version>1.4.4</version>
+			<version>1.4.18</version>
 		</dependency>
 		<dependency>
 			<groupId>commons-lang</groupId>