diff --git a/Dockerfile b/Dockerfile
index 01475b0..22d04f4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -43,6 +43,6 @@
 
 RUN DEBIAN_FRONTEND=noninteractive apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get -y install wget build-essential dh-make \
-                                              openjdk-19-jdk maven
-RUN update-java-alternatives --jre-headless --set /usr/lib/jvm/java-1.19.0-openjdk-amd64
+                                              openjdk-21-jdk maven
+RUN update-java-alternatives --jre-headless --set /usr/lib/jvm/java-1.21.0-openjdk-amd64