diff --git a/package.json b/package.json
index ac3ccc0..cbd470f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "monads-io",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "description": "🚀 Efficient Monads for JS: Maybe (Option) and Either (Result), Identity",
   "scripts": {
     "test": "jest",
@@ -68,6 +68,15 @@
     "index.js",
     "index.mjs",
     "index.d.ts",
+    "either.js",
+    "either.mjs",
+    "either.d.ts",
+    "identity.js",
+    "identity.mjs",
+    "identity.d.ts",
+    "maybe.js",
+    "maybe.mjs",
+    "maybe.d.ts",
     "README.md",
     "CHANGELOG.md",
     "CONTRIBUTING.md",