diff --git a/resteasy6/pom.xml b/resteasy6/pom.xml
index d34e3e7..26a2c39 100644
--- a/resteasy6/pom.xml
+++ b/resteasy6/pom.xml
@@ -18,7 +18,7 @@
 
     <jersey.version>3.0.10</jersey.version>
     <weld.version>4.0.3.Final</weld.version>
-    <undertow.version>2.2.20.Final</undertow.version>
+    <undertow.version>2.3.17.Final</undertow.version>
     <jboss-logging.version>3.6.1.Final</jboss-logging.version>
     <commons-codec.version>1.17.1</commons-codec.version>
     <wildfly-common.version>1.7.0.Final</wildfly-common.version>