diff --git a/Dockerfile b/Dockerfile
index 603c137..cc6e862 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:20-alpine as build-stage
+FROM node:20-alpine AS build-stage
 
 WORKDIR /app
 RUN corepack enable
@@ -10,7 +10,7 @@ RUN --mount=type=cache,id=pnpm-store,target=/root/.pnpm-store \
 COPY . .
 RUN pnpm build
 
-FROM node:20-alpine as production-stage
+FROM node:20-alpine AS production-stage
 WORKDIR /srv/ipv6-test
 
 ENV NODE_ENV production