diff --git a/Dockerfile b/Dockerfile
index 605ce1b..58d5d86 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:16.04
+FROM debian:bullseye-slim
 
 RUN apt-get update \
     && DEBIAN_FRONTEND=noninteractive apt-get -y install strongswan iptables uuid-runtime ndppd openssl \