diff --git a/core/nginx/Dockerfile b/core/nginx/Dockerfile
index ad6752a..a88f9f5 100644
--- a/core/nginx/Dockerfile
+++ b/core/nginx/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:edge
+FROM alpine:3.8
 
 RUN apk add --no-cache nginx nginx-mod-mail python py-jinja2 certbot openssl