diff --git a/Dockerfile b/Dockerfile
index 6409625..e246e44 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,7 +14,7 @@ ARG PYTHON_IMAGE=python:3.14.4-alpine3.23
 ARG PYTHON_HASH=sha256:dd4d2bd5b53d9b25a51da13addf2be586beebd5387e289e798e4083d94ca837a
 
 # ---- STAGE 1: Frontend Build ----
-FROM ${NODE_IMAGE}@${NODE_HASH} AS build-frontend
+FROM --platform=linux/amd64 ${NODE_IMAGE}@${NODE_HASH} AS build-frontend
 WORKDIR /src
 RUN apk add --no-cache git
 COPY package.json pnpm-lock.yaml vite.config.js ./
diff --git a/Dockerfile.hardened b/Dockerfile.hardened
index 1b20194..f46b3f6 100644
--- a/Dockerfile.hardened
+++ b/Dockerfile.hardened
@@ -10,7 +10,7 @@ ARG NODE_IMAGE=cgr.dev/chainguard/node:latest-dev
 ARG PYTHON_BUILD_IMAGE=cgr.dev/chainguard/python:latest-dev
 ARG PYTHON_RUNTIME_IMAGE=cgr.dev/chainguard/python:latest-dev
 
-FROM ${NODE_IMAGE} AS build-frontend
+FROM --platform=linux/amd64 ${NODE_IMAGE} AS build-frontend
 USER root
 WORKDIR /src
 RUN apk add --no-cache git