diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8260cec..e75f49b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 # CHANGELOG
 
 ## 3.0.0
+- Add node.js support
 - Upgrade to TypeScript 4.9
 - Add exports in package.json
 - This package is now pure ESM. Please [read this](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c).
diff --git a/package.json b/package.json
index 6c76611..2b3c213 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
     "tsconfig.esm.json"
   ],
   "engines": {
-    "node": ">=14.16"
+    "node": ">=18.12"
   },
   "scripts": {
     "clean": "rimraf ./lib ./coverage",
diff --git a/src/fetch.ts b/src/fetch.ts
index ed31406..bbcd2c8 100644
--- a/src/fetch.ts
+++ b/src/fetch.ts
@@ -49,7 +49,7 @@ export interface FetchEventSourceInit extends RequestInit {
      */
     openWhenHidden?: boolean;
 
-    /** The Fetch function to use. Defaults to window.fetch */
+    /** The Fetch function to use. Defaults to fetch */
     fetch?: typeof fetch;
 }
 
@@ -79,15 +79,17 @@ export function fetchEventSource(input: RequestInfo, {
             }
         }
 
-        if (!openWhenHidden) {
+        if (typeof window !== 'undefined' && !openWhenHidden) {
             document.addEventListener('visibilitychange', onVisibilityChange);
         }
 
         let retryInterval = DefaultRetryInterval;
         let retryTimer = 0;
         function dispose() {
-            document.removeEventListener('visibilitychange', onVisibilityChange);
-            window.clearTimeout(retryTimer);
+            if (typeof window !== 'undefined' && !openWhenHidden) {
+                document.removeEventListener('visibilitychange', onVisibilityChange);
+            }
+            clearTimeout(retryTimer);
             curRequestController.abort();
         }
 
@@ -97,12 +99,12 @@ export function fetchEventSource(input: RequestInfo, {
             resolve(); // don't waste time constructing/logging errors
         });
 
-        const fetch = inputFetch ?? window.fetch;
+        const fetchFn = inputFetch ?? fetch;
         const onopen = inputOnOpen ?? defaultOnOpen;
         async function create() {
             curRequestController = new AbortController();
             try {
-                const response = await fetch(input, {
+                const response = await fetchFn(input, {
                     ...rest,
                     headers,
                     signal: curRequestController.signal,
@@ -131,8 +133,8 @@ export function fetchEventSource(input: RequestInfo, {
                     try {
                         // check if we need to retry:
                         const interval: any = onerror?.(err) ?? retryInterval;
-                        window.clearTimeout(retryTimer);
-                        retryTimer = window.setTimeout(create, interval);
+                        clearTimeout(retryTimer);
+                        retryTimer = setTimeout(create, interval);
                     } catch (innerErr) {
                         // we should not retry anymore:
                         dispose();