diff --git a/docker/Dockerfile-server b/docker/Dockerfile-server
index 912d3e899..fe11fa4bb 100644
--- a/docker/Dockerfile-server
+++ b/docker/Dockerfile-server
@@ -14,7 +14,7 @@
 #   limitations under the License.
 #
 
-ARG JDK_VERSION=17
+ARG JDK_VERSION=21
 
 FROM maven:3.9.6-eclipse-temurin-${JDK_VERSION} as builder