diff --git a/pom.xml b/pom.xml
index f92c8d0..15eb4cb 100644
--- a/pom.xml
+++ b/pom.xml
@@ -42,7 +42,7 @@
     <projectOwner>Red Hat, Inc.</projectOwner>
     <projectEmail>https://github.com/Commonjava/http-testserver</projectEmail>
     <javaVersion>11</javaVersion>
-    <undertowVersion>2.3.20.Final</undertowVersion>
+    <undertowVersion>2.3.21.Final</undertowVersion>
     <quarkus.version>3.6.9</quarkus.version>
   </properties>