diff --git a/build/Dockerfile b/build/Dockerfile
index d18ab6f..a29e0e3 100644
--- a/build/Dockerfile
+++ b/build/Dockerfile
@@ -1,4 +1,4 @@
-FROM maven:3.9-eclipse-temurin-17
+FROM maven:3.9-eclipse-temurin-21
 
 # Node.js 22 LTS via NodeSource
 RUN apt-get update && apt-get install -y ca-certificates curl gnupg \