diff --git a/pom.xml b/pom.xml
index 00bd94e8d256..56c2525fc186 100644
--- a/pom.xml
+++ b/pom.xml
@@ -134,7 +134,7 @@
         <ua-parser.version>1.5.4</ua-parser.version>
         <org.yaml.snakeyaml.version>2.0</org.yaml.snakeyaml.version>
         <picketbox.version>5.0.3.Final</picketbox.version>
-        <xstream.version>1.4.20</xstream.version>
+        <xstream.version>1.4.21</xstream.version>
         <org.snakeyaml.snakeyaml-engine.version>2.6</org.snakeyaml.snakeyaml-engine.version>
 
         <!-- Others -->