diff --git a/build.sbt b/build.sbt
index fe56a9dbc..6ee8b601c 100644
--- a/build.sbt
+++ b/build.sbt
@@ -244,7 +244,7 @@ lazy val mdoc = project
       "com.googlecode.java-diff-utils" % "diffutils" % "1.3.0",
       "io.methvin" % "directory-watcher" % "0.15.1",
       // live reload
-      "io.undertow" % "undertow-core" % "2.2.18.Final",
+      "io.undertow" % "undertow-core" % "2.2.19.Final",
       "org.jboss.xnio" % "xnio-nio" % "3.8.7.Final",
       "org.slf4j" % "slf4j-api" % "1.7.36",
       "com.geirsson" %% "metaconfig-typesafe-config" % V.metaconfig,