diff --git a/rsbuild.config.ts b/rsbuild.config.ts
index 336ab67d..794d9d63 100644
--- a/rsbuild.config.ts
+++ b/rsbuild.config.ts
@@ -14,6 +14,13 @@ export default defineConfig({
             BROWSER_BUILD: true,
         },
     },
+    resolve: {
+        // proxy-agent is a Node.js-only package, exclude it from the browser bundle.
+        // The isNode() guard in http_client.ts ensures it's never called in browsers.
+        alias: {
+            'proxy-agent': false,
+        },
+    },
     output: {
         distPath: { js: '.' },
         filename: { js: 'bundle.js' },
diff --git a/src/http_client.ts b/src/http_client.ts
index 773b4a64..77bc38b2 100644
--- a/src/http_client.ts
+++ b/src/http_client.ts
@@ -6,6 +6,7 @@ import type { RetryFunction } from 'async-retry';
 import retry from 'async-retry';
 import type { AxiosError, AxiosInstance, AxiosRequestConfig, AxiosResponse, InternalAxiosRequestConfig } from 'axios';
 import axios, { AxiosHeaders } from 'axios';
+import { ProxyAgent } from 'proxy-agent';
 
 import { APIFY_ENV_VARS } from '@apify/consts';
 import type { Log } from '@apify/log';
@@ -115,13 +116,8 @@ export class HttpClient {
 
     private async initNode(): Promise<void> {
         if (!isNode()) return;
-
-        const [{ ProxyAgent }, os] = await Promise.all([
-            // eslint-disable-next-line @typescript-eslint/consistent-type-imports
-            dynamicNodeImport<typeof import('proxy-agent')>('proxy-agent'),
-            // eslint-disable-next-line @typescript-eslint/consistent-type-imports
-            dynamicNodeImport<typeof import('node:os')>('node:os'),
-        ]);
+        // eslint-disable-next-line @typescript-eslint/consistent-type-imports
+        const os = await dynamicNodeImport<typeof import('node:os')>('node:os');
 
         // We want to keep sockets alive for better performance.
         // Enhanced agent configuration based on agentkeepalive best practices: