diff --git a/build.sbt b/build.sbt
index 94654bad6..c6bdb92c8 100644
--- a/build.sbt
+++ b/build.sbt
@@ -231,7 +231,7 @@ lazy val mdoc = project
       "com.googlecode.java-diff-utils" % "diffutils" % "1.3.0",
       "io.methvin" % "directory-watcher" % "0.15.0",
       // live reload
-      "io.undertow" % "undertow-core" % "2.2.12.Final",
+      "io.undertow" % "undertow-core" % "2.2.13.Final",
       "org.jboss.xnio" % "xnio-nio" % "3.8.4.Final",
       "org.slf4j" % "slf4j-api" % "1.7.32"
     )