diff --git a/libs/client/package.json b/libs/client/package.json
index 6015b2c..36812fc 100644
--- a/libs/client/package.json
+++ b/libs/client/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@fal-ai/serverless-client",
   "description": "The fal serverless JS/TS client",
-  "version": "0.14.1-alpha.0",
+  "version": "0.14.1-alpha.3",
   "license": "MIT",
   "repository": {
     "type": "git",
diff --git a/libs/client/src/config.ts b/libs/client/src/config.ts
index 06aa358..120aba9 100644
--- a/libs/client/src/config.ts
+++ b/libs/client/src/config.ts
@@ -8,6 +8,17 @@ import { defaultResponseHandler } from './response';
 
 export type CredentialsResolver = () => string | undefined;
 
+type FetchType = typeof fetch;
+
+export function resolveDefaultFetch(): FetchType {
+  if (typeof fetch === 'undefined') {
+    throw new Error(
+      'Your environment does not support fetch. Please provide your own fetch implementation.'
+    );
+  }
+  return fetch;
+}
+
 export type Config = {
   /**
    * The credentials to use for the fal serverless client. When using the
@@ -46,7 +57,7 @@ export type Config = {
    * The fetch implementation to use for the client requests. By default it uses
    * the global `fetch` function.
    */
-  fetch?: typeof fetch;
+  fetch?: FetchType;
 };
 
 export type RequiredConfig = Required<Config>;
@@ -94,7 +105,11 @@ let configuration: RequiredConfig;
  * @param config the new configuration.
  */
 export function config(config: Config) {
-  configuration = { ...DEFAULT_CONFIG, ...config } as RequiredConfig;
+  configuration = {
+    ...DEFAULT_CONFIG,
+    ...config,
+    fetch: config.fetch ?? resolveDefaultFetch(),
+  } as RequiredConfig;
   if (config.proxyUrl) {
     configuration = {
       ...configuration,
@@ -125,7 +140,10 @@ export function config(config: Config) {
 export function getConfig(): RequiredConfig {
   if (!configuration) {
     console.info('Using default configuration for the fal client');
-    return { ...DEFAULT_CONFIG } as RequiredConfig;
+    return {
+      ...DEFAULT_CONFIG,
+      fetch: resolveDefaultFetch(),
+    } as RequiredConfig;
   }
   return configuration;
 }
diff --git a/libs/client/src/request.ts b/libs/client/src/request.ts
index 40dd8c4..fc3e215 100644
--- a/libs/client/src/request.ts
+++ b/libs/client/src/request.ts
@@ -20,7 +20,7 @@ export async function dispatchRequest<Input, Output>(
     credentials: credentialsValue,
     requestMiddleware,
     responseHandler,
-    fetch = global.fetch,
+    fetch,
   } = getConfig();
   const userAgent = isBrowser() ? {} : { 'User-Agent': getUserAgent() };
   const credentials =
diff --git a/libs/client/src/storage.ts b/libs/client/src/storage.ts
index 3544815..a9a2ea1 100644
--- a/libs/client/src/storage.ts
+++ b/libs/client/src/storage.ts
@@ -76,7 +76,7 @@ type KeyValuePair = [string, any];
 
 export const storageImpl: StorageSupport = {
   upload: async (file: Blob) => {
-    const { fetch = global.fetch } = getConfig();
+    const { fetch } = getConfig();
     const { upload_url: uploadUrl, file_url: url } = await initiateUpload(file);
     const response = await fetch(uploadUrl, {
       method: 'PUT',
diff --git a/libs/client/src/streaming.ts b/libs/client/src/streaming.ts
index bcca90b..2af54dd 100644
--- a/libs/client/src/streaming.ts
+++ b/libs/client/src/streaming.ts
@@ -129,7 +129,7 @@ export class FalStream<Input, Output> {
         // if we are in the browser, we need to get a temporary token
         // to authenticate the request
         const token = await getTemporaryAuthToken(endpointId);
-        const { fetch = global.fetch } = getConfig();
+        const { fetch } = getConfig();
         const parsedUrl = new URL(this.url);
         parsedUrl.searchParams.set('fal_jwt_token', token);
         const response = await fetch(parsedUrl.toString(), {