diff --git a/zmq-playground/pom.xml b/zmq-playground/pom.xml
index 7f9135e..36884da 100644
--- a/zmq-playground/pom.xml
+++ b/zmq-playground/pom.xml
@@ -21,7 +21,7 @@
     <dependency>
       <groupId>com.thoughtworks.xstream</groupId>
       <artifactId>xstream</artifactId>
-      <version>1.4.11.1</version>
+      <version>1.4.18</version>
     </dependency>
     <dependency>
       <groupId>org.projectlombok</groupId>