diff --git a/Dockerfile b/Dockerfile
index b0f5c54..011055c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM nginx:alpine as build
+FROM nginx:alpine@sha256:2140dad235c130ac861018a4e13a6bc8aea3a35f3a40e20c1b060d51a7efd250 as build
 
 RUN apk add --update \
     wget
@@ -13,7 +13,7 @@ COPY ./ /site
 WORKDIR /site
 RUN hugo
 
-FROM nginx:alpine
+FROM nginx:alpine@sha256:2140dad235c130ac861018a4e13a6bc8aea3a35f3a40e20c1b060d51a7efd250
 ADD default.conf /etc/nginx/conf.d/default.conf
 COPY --from=build /site/public /usr/share/nginx/html