diff --git a/build.gradle b/build.gradle
index ecf3bb9203..8d5a60ecf9 100644
--- a/build.gradle
+++ b/build.gradle
@@ -391,7 +391,7 @@ dependencies {
     implementation 'de.muntjak.tinylookandfeel:tinylaf-nocp:1.4.0'
 
     // serialize to and from xml
-    implementation 'com.thoughtworks.xstream:xstream:1.4.20'
+    implementation 'com.thoughtworks.xstream:xstream:1.4.21'
 
     // themes
     implementation 'com.formdev:flatlaf:3.5.4'