diff --git a/package-lock.json b/package-lock.json
index fca6b70..50bcec1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "web-streams-polyfill",
-  "version": "3.3.3",
+  "version": "4.0.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "web-streams-polyfill",
-      "version": "3.3.3",
+      "version": "4.0.0",
       "license": "MIT",
       "devDependencies": {
         "@microsoft/api-extractor": "^7.41.1",
diff --git a/package.json b/package.json
index 5a7f8c8..48424e2 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "web-streams-polyfill",
-  "version": "3.3.3",
+  "version": "4.0.0",
   "description": "Web Streams, based on the WHATWG spec reference implementation",
   "main": "dist/ponyfill.js",
   "module": "dist/ponyfill.mjs",