diff --git a/Dockerfile b/Dockerfile
index c30bd9e..7f93b2b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM openjdk:11.0.16-jdk-slim AS builder
+FROM openjdk:21-jdk-slim AS builder
 
 WORKDIR /builder/httpstub
 COPY *.gradle gradlew .