diff --git a/Dockerfile b/Dockerfile
index ab515452..b4620f6d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,7 +13,7 @@ RUN npm run build
 # Builder image for the Scala app
 # based on https://github.com/hseeberger/scala-sbt
 #
-FROM eclipse-temurin:17-jdk AS scalabuilder
+FROM eclipse-temurin:21-jdk AS scalabuilder
 
 # We need nodejs to run in a reasonable amount of time sbt-web
 # see step `Optimizing JavaScript with RequireJS`
@@ -53,7 +53,7 @@ RUN sbt clean stage
 # Final Image
 #
 #
-FROM eclipse-temurin:17-jre
+FROM eclipse-temurin:21-jre
 
 ENV PLAY_APP_NAME aplus
 ENV PLAY_APP_DIR /var/www/$PLAY_APP_NAME