diff --git a/run/http4k-hello-world/build.gradle.kts b/run/http4k-hello-world/build.gradle.kts
index 437e77ce..9a1fe5ba 100644
--- a/run/http4k-hello-world/build.gradle.kts
+++ b/run/http4k-hello-world/build.gradle.kts
@@ -9,7 +9,7 @@ repositories {
 
 dependencies {
     implementation("org.http4k:http4k-core:5.13.9.0")
-    implementation("org.http4k:http4k-server-undertow:5.13.8.0")
+    implementation("org.http4k:http4k-server-undertow:5.13.9.0")
 }
 
 kotlin {