diff --git a/packages/app/src/vite-ssr-plugin.ts b/packages/app/src/vite-ssr-plugin.ts
index 31c0449..ba21918 100644
--- a/packages/app/src/vite-ssr-plugin.ts
+++ b/packages/app/src/vite-ssr-plugin.ts
@@ -1,4 +1,5 @@
 import type { Plugin, ViteDevServer, ModuleNode } from "vite";
+import fs from "node:fs";
 import path from "node:path";
 import { ssrPrefetch } from "./ssr-prefetch.ts";
 
@@ -106,7 +107,7 @@ export function ssrDevPlugin({ isMultiSphere = false } = {}): Plugin {
           }
 
           // Read and transform the index.html template
-          let template = await Bun.file(path.resolve(server.config.root, "index.html")).text();
+          let template = fs.readFileSync(path.resolve(server.config.root, "index.html"), "utf-8");
           template = await server.transformIndexHtml(url, template);
 
           // Load the SSR entry via Vite's module graph (supports HMR)