diff --git a/build.sbt b/build.sbt
index 3e8d4d4..e2f13b2 100644
--- a/build.sbt
+++ b/build.sbt
@@ -127,7 +127,7 @@ lazy val e2e = projectMatrix
     libraryDependencies ++= Seq(
       "com.thesamet.scalapb" %% "scalapb-json4s" % "0.12.1",
       "org.typelevel" %% "cats-core" % "2.10.0",
-      "io.undertow" % "undertow-core" % "2.3.8.Final",
+      "io.undertow" % "undertow-core" % "2.3.9.Final",
       "eu.timepit" %% "refined" % "0.11.0",
       "io.envoyproxy.protoc-gen-validate" % "pgv-java-stub" % pgvVersion % "protobuf"
     ),