diff --git a/Dockerfile.template b/Dockerfile.template
index 2ea64648..db2c72fb 100644
--- a/Dockerfile.template
+++ b/Dockerfile.template
@@ -7,7 +7,7 @@ ARG ALPINE_VERSION="3.19"
 ###################################################
 # Build the supervisor dependencies
 ###################################################
-FROM alpine:${ALPINE_VERSION} as build-base
+FROM alpine:${ALPINE_VERSION} AS build-base
 
 ARG ARCH
 ARG NODE
@@ -51,7 +51,7 @@ RUN npm ci --build-from-source=sqlite3 --sqlite=/usr/lib
 # musl. We hack around this by copying the binary and its library
 # dependencies to the final image
 ###################################################################
-FROM debian:bullseye-slim as journal
+FROM debian:bullseye-slim AS journal
 
 RUN apt-get update && apt-get install -y --no-install-recommends systemd
 
@@ -62,7 +62,7 @@ RUN /setup-journal.sh
 # Extra dependencies. This uses alpine 3.11 as the
 # procmail package was removed on 3.12
 ###################################################
-FROM alpine:3.11 as extra
+FROM alpine:3.11 AS extra
 
 RUN apk add --update --no-cache procmail
 
@@ -70,7 +70,7 @@ RUN apk add --update --no-cache procmail
 # Image with the final production dependencies.
 # This image will also be be used for testing
 ###################################################
-FROM alpine:${ALPINE_VERSION} as runtime-base
+FROM alpine:${ALPINE_VERSION} AS runtime-base
 
 ARG NODE
 
@@ -113,7 +113,7 @@ ENV LED_FILE=/dev/null \
 ###############################################################
 # Use the base image to run integration tests and for livepush
 ###############################################################
-FROM runtime-base as test
+FROM runtime-base AS test
 
 ARG NPM
 ARG ARCH
@@ -160,7 +160,7 @@ CMD npm run test:integration
 ###################################################
 # Build the production package
 ###################################################
-FROM build-base as build-prod
+FROM build-base AS build-prod
 
 WORKDIR /usr/src/app