diff --git a/Dockerfile b/Dockerfile
index 50a9927..43615b2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,7 +14,11 @@ ENV NEXT_PUBLIC_SITE_URL=$NEXT_PUBLIC_SITE_URL
 ENV NEXT_PUBLIC_GA_MEASUREMENT_ID=$NEXT_PUBLIC_GA_MEASUREMENT_ID
 
 COPY package*.json ./
-RUN npm install
+# Force dev-deps even if NODE_ENV=production was supplied as a Coolify
+# build arg — autoprefixer/postcss/tailwindcss live in devDependencies and
+# Next.js needs them at build time. Same fix that landed for RMP cold-build
+# on 2026-05-30.
+RUN npm install --include=dev
 COPY . .
 RUN npm run build
 ENV NODE_ENV=production