diff --git a/diylc/pom.xml b/diylc/pom.xml
index c292cf9f..8f852003 100644
--- a/diylc/pom.xml
+++ b/diylc/pom.xml
@@ -23,7 +23,7 @@
         <maven.compiler.source>17</maven.compiler.source>
         <maven.compiler.target>17</maven.compiler.target>
         <log4j.version>1.2.15</log4j.version>
-        <xstream.version>1.4.19</xstream.version>
+        <xstream.version>1.4.21</xstream.version>
     </properties>
     
     <!-- Build configuration will be defined below -->