diff --git a/web/app/lib/config.tsx b/web/app/lib/config.tsx
index 718e1784..fc3dca56 100644
--- a/web/app/lib/config.tsx
+++ b/web/app/lib/config.tsx
@@ -1,6 +1,6 @@
-import { ExternalLinkIcon } from "lucide-react";
 import type { LinkItemType } from "fumadocs-ui/layouts/shared";
 
+import { ExternalLinkIcon } from "lucide-react";
 import { useTranslation } from "react-i18next";
 
 import { LanguageSwitcher } from "@/components/language-switcher";
diff --git a/web/vite.config.ts b/web/vite.config.ts
index b7bf6303..f27e4340 100644
--- a/web/vite.config.ts
+++ b/web/vite.config.ts
@@ -10,6 +10,9 @@ export default defineConfig(({ command, mode }) => {
   const contextPath = env.VITE_APP_API_URL?.trim() ?? "";
 
   return {
+    // React Router 8 prerendering requests the Vite preview server over HTTP.
+    // Bind it explicitly to IPv4 so `localhost` resolves to the address being listened on in Docker.
+    preview: { host: "127.0.0.1" },
     base: isDev || !contextPath ? "/" : `${contextPath}/`,
     plugins: [fumadocsMdx(), tailwindcss(), reactRouter(), devtoolsJson()],
     resolve: {