diff --git a/frontend/src/lib/api.js b/frontend/src/lib/api.js
index 2ce5b67..5a48db7 100644
--- a/frontend/src/lib/api.js
+++ b/frontend/src/lib/api.js
@@ -1,7 +1,5 @@
-const BASE = import.meta.env.VITE_API_URL || 'http://localhost:3000';
-
 export async function api(path, options = {}) {
-  const res = await fetch(`${BASE}/api/v1${path}`, {
+  const res = await fetch(`/api/v1${path}`, {
     credentials: 'include',
     headers: {
       'Content-Type': 'application/json',
diff --git a/frontend/src/lib/sse.js b/frontend/src/lib/sse.js
index 990f067..e867c45 100644
--- a/frontend/src/lib/sse.js
+++ b/frontend/src/lib/sse.js
@@ -1,7 +1,5 @@
-const BASE = import.meta.env.VITE_API_URL || 'http://localhost:3000';
-
 export function openEventStream(handlers) {
-  const url = `${BASE}/api/v1/events`;
+  const url = `/api/v1/events`;
   const source = new EventSource(url, { withCredentials: true });
 
   for (const [event, handler] of Object.entries(handlers)) {
diff --git a/frontend/vite.config.js b/frontend/vite.config.js
index 93ea31e..d0f669f 100644
--- a/frontend/vite.config.js
+++ b/frontend/vite.config.js
@@ -1,7 +1,19 @@
-import { defineConfig } from 'vite';
+import { defineConfig, loadEnv } from 'vite';
 import react from '@vitejs/plugin-react';
 
-export default defineConfig({
-  plugins: [react()],
-  server: { port: 5173 },
+export default defineConfig(({ mode }) => {
+  const env = loadEnv(mode, process.cwd(), '');
+
+  return {
+    plugins: [react()],
+    server: {
+      port: 5173,
+      proxy: {
+        '/api': {
+          target: env.VITE_API_URL || 'http://localhost:3000',
+          changeOrigin: true,
+        },
+      },
+    },
+  };
 });