diff --git a/Dockerfile b/Dockerfile
index b80746bb..b4e9d427 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,8 @@
 # syntax=docker/dockerfile:1.7
-FROM oven/bun:1.3.14-alpine AS manifests
+# The web bundle and self-hosted server are plain JavaScript. Build them on the
+# runner's own architecture. QEMU arm64 hangs in Vite until the publish job hits
+# its timeout. The runtime image below still follows the target architecture.
+FROM --platform=$BUILDPLATFORM oven/bun:1.3.14-alpine AS manifests
 WORKDIR /app
 
 COPY package.json bun.lock bunfig.toml ./
diff --git a/scripts/docker-release.test.mjs b/scripts/docker-release.test.mjs
index b1d59bc0..de458113 100644
--- a/scripts/docker-release.test.mjs
+++ b/scripts/docker-release.test.mjs
@@ -58,6 +58,7 @@ describe("Docker release contract", () => {
       dockerfile.indexOf("FROM oven/bun:1.3.14-alpine AS runtime"),
     );
     const packageMetadata = JSON.parse(readProjectFile("package.json"));
+    expect(dockerfile).toContain("FROM --platform=$BUILDPLATFORM oven/bun:1.3.14-alpine AS manifests");
     expect(dockerfile).toContain("FROM oven/bun:1.3.14-alpine AS runtime");
     expect(dockerfile).toContain("COPY patches patches");
     expect(dockerfile).toContain("COPY docs docs");