diff --git a/package.json b/package.json
index efa0cbf..bc1f145 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sonic-boom",
-  "version": "3.8.1",
+  "version": "4.0.0",
   "description": "Extremely fast utf8 only stream implementation",
   "main": "index.js",
   "type": "commonjs",