diff --git a/Dockerfile.dapper b/Dockerfile.dapper
index cf8a508..028b86c 100644
--- a/Dockerfile.dapper
+++ b/Dockerfile.dapper
@@ -1,4 +1,4 @@
-FROM ubuntu:16.04
+FROM ubuntu:devel
 # FROM arm=armhf/ubuntu:16.04
 
 ARG DAPPER_HOST_ARCH
diff --git a/package/Dockerfile b/package/Dockerfile
old mode 100755
new mode 100644
index 9635f69..1b29ec5
--- a/package/Dockerfile
+++ b/package/Dockerfile
@@ -19,7 +19,7 @@
 # Note that fluentd is run with root permssion to allow access to
 # log files with root only access under /var/log/containers/*
 
-FROM debian:stretch-slim
+FROM debian:buster-20210329-slim
 
 ARG DEBIAN_FRONTEND=noninteractive