diff --git a/Dockerfile b/Dockerfile
index bdf5708b489dbd94cd3841cc823d53b7df59feb5..21ac6bc66e7e674b8dce10387c2df0eaf6cdaaee 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM debian:jessie
+FROM debian:stretch-slim
 ENV DEBIAN_FRONTEND noninteractive
 RUN apt-get update && \
     apt-get install -y unbound unbound-host dnsutils dma bsd-mailx && \