diff --git a/rootfs/Dockerfile b/rootfs/Dockerfile
index ea85e0b..9b1c488 100644
--- a/rootfs/Dockerfile
+++ b/rootfs/Dockerfile
@@ -1,4 +1,4 @@
-FROM heroku/cedar:14
+FROM heroku/heroku:16
 
 RUN mkdir /app
 RUN addgroup --quiet --gid 2000 slug && \
diff --git a/rootfs/builder/build.sh b/rootfs/builder/build.sh
index c824718..0983b29 100755
--- a/rootfs/builder/build.sh
+++ b/rootfs/builder/build.sh
@@ -97,7 +97,7 @@ export APP_DIR="$app_dir"
 export HOME="$app_dir"
 REQUEST_ID=$(openssl rand -base64 32)
 export REQUEST_ID
-export STACK=cedar-14
+export STACK=heroku-16
 
 ## copy the environment dir excluding the ephemeral ..data/ dir and other symlinks created by Kubernetes.