diff --git a/package.json b/package.json
index f9aabb6..688cc1d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ts-cat",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "description": "A fantasy-land and static-land compliant library providing interfaces of common type-classes and instances of them.",
   "keywords": [],
   "main": "dist/ts-cat.umd.js",