diff --git a/Dockerfile.demo b/Dockerfile.demo
index 22e1a1e..4f75fde 100644
--- a/Dockerfile.demo
+++ b/Dockerfile.demo
@@ -1,5 +1,5 @@
 # ── Stage 1: build frontend ───────────────────────────────────────────────────
-FROM node:20-alpine AS frontend-build
+FROM node:26-alpine AS frontend-build
 WORKDIR /app
 COPY frontend/package.json frontend/package-lock.json* ./
 RUN npm ci