diff --git a/suggester/pom.xml b/suggester/pom.xml
index 366a708c8a9..dbb2a030be2 100644
--- a/suggester/pom.xml
+++ b/suggester/pom.xml
@@ -121,7 +121,7 @@ Portions Copyright (c) 2020, Chris Fraire <cfraire@me.com>.
         <dependency>
             <groupId>com.thoughtworks.xstream</groupId>
             <artifactId>xstream</artifactId>
-            <version>1.4.20</version>
+            <version>1.4.21</version>
         </dependency>
 
         <dependency>