diff --git a/tatort/Dockerfile b/tatort/Dockerfile
index b5a59a9..28eb977 100644
--- a/tatort/Dockerfile
+++ b/tatort/Dockerfile
@@ -1,15 +1,17 @@
+# --- Build stage ---
 FROM node:19 as build
 ENV NODE_ENV=production
 WORKDIR /app
 COPY package.json ./
 COPY package-lock.json ./
-RUN npm install
+RUN npm ci
 COPY . ./
 RUN npm run build
+
+# --- Production stage ---
 FROM node:19-alpine3.16
-WORKDIR /app
 COPY --from=build /app .
 ENV HOST=0.0.0.0
-EXPOSE 3000
-CMD ["npm","start","run", "preview","--", "--host", "0.0.0.0"]
+EXPOSE 4173
+CMD ["npm", "run", "preview","--", "--host", "0.0.0.0"]