diff --git a/pom.xml b/pom.xml
index 0762f88a8d..522b7b0484 100644
--- a/pom.xml
+++ b/pom.xml
@@ -125,7 +125,7 @@
     <truezip.version>6.6</truezip.version>
     <velocity.version>1.7</velocity.version>
     <xmlunit.version>1.6</xmlunit.version>
-    <xstream.version>1.4.19</xstream.version>
+    <xstream.version>1.4.21</xstream.version>
 
     <!-- maven plugins -->
     <github-release-plugin.version>1.2.0</github-release-plugin.version>