diff --git a/package.json b/package.json
index b025002..7059dc0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@johntalton/i2c-bus-mcp2221",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "type": "module",
   "exports": {
     "import": "./lib/index.js",
@@ -9,6 +9,7 @@
   "files": [
     "src/**/*.ts",
     "lib/**/*.js",
+    "lib/**/*.js.map",
     "lib/**/*.d.ts",
     "lib/**/*.d.ts.map"
   ],