diff --git a/package-lock.json b/package-lock.json
index 598b296..a6b086f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "node-pkware",
-  "version": "4.0.0-alpha.9",
+  "version": "4.0.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "node-pkware",
-      "version": "4.0.0-alpha.9",
+      "version": "4.0.0",
       "license": "MIT",
       "dependencies": {
         "minimist-lite": "^2.2.1"
diff --git a/package.json b/package.json
index 1d2c7f3..df0bdb8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "node-pkware",
-  "version": "4.0.0-alpha.9",
+  "version": "4.0.0",
   "description": "nodejs implementation of StormLib's pkware compressor/de-compressor",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",