diff --git a/core/unbound/Dockerfile b/core/unbound/Dockerfile
index 6ae8a6ee..3c7f0e7a 100644
--- a/core/unbound/Dockerfile
+++ b/core/unbound/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:edge
+FROM alpine:3.8
 
 RUN apk add --no-cache unbound curl \
 	&& curl -o /etc/unbound/root.hints https://www.internic.net/domain/named.cache \