diff --git a/Dockerfile b/Dockerfile
index 579a318..f805904 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -21,7 +21,7 @@ RUN curl -sSLo /${JMXEX_JAR_NAME} ${JMXEX_URL}
 #
 FROM alpine:3 as pkg_base
 
-RUN apk add --no-cache --upgrade openjdk11 bash git docker make
+RUN apk add --no-cache --upgrade openjdk21 bash git docker make
 
 #
 # construct swarm agent runtime