diff --git a/build/Makefile b/build/Makefile
index ee1609a..6da70b3 100644
--- a/build/Makefile
+++ b/build/Makefile
@@ -1,4 +1,4 @@
-FROM = debian:jessie
+FROM = debian:stretch
 MODE = minimal
 PROXY = $(shell hostname -i)
 TIMEZONE = Europe/London