diff --git a/CHANGELOG.md b/CHANGELOG.md
index 484db93..4e0f206 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,19 @@
 
 ## [Unreleased](https://github.com/pbojinov/request-ip/tree/HEAD)
 
-[Full Changelog](https://github.com/pbojinov/request-ip/compare/3.0.2...HEAD)
+[Full Changelog](https://github.com/pbojinov/request-ip/compare/3.1.0...HEAD)
+
+**Closed issues:**
+
+- Incompatible with Next.js middleware/Vercel edge functions [\#63](https://github.com/pbojinov/request-ip/issues/63)
+
+## [3.1.0](https://github.com/pbojinov/request-ip/tree/3.1.0) (2022-07-06)
+
+[Full Changelog](https://github.com/pbojinov/request-ip/compare/v4.0.0...3.1.0)
+
+## [v4.0.0](https://github.com/pbojinov/request-ip/tree/v4.0.0) (2022-07-06)
+
+[Full Changelog](https://github.com/pbojinov/request-ip/compare/3.0.2...v4.0.0)
 
 **Merged pull requests:**
 
diff --git a/dist/index.js b/lib/index.js
similarity index 99%
rename from dist/index.js
rename to lib/index.js
index fdb9e5c..13811b2 100644
--- a/dist/index.js
+++ b/lib/index.js
@@ -144,5 +144,4 @@ module.exports = {
   getClientIpFromXForwardedFor: getClientIpFromXForwardedFor,
   getClientIp: getClientIp,
   mw: mw
-};
-
+};
\ No newline at end of file
diff --git a/lib/is.js b/lib/is.js
new file mode 100644
index 0000000..a509378
--- /dev/null
+++ b/lib/is.js
@@ -0,0 +1,42 @@
+"use strict";
+
+var regexes = {
+  ipv4: /^(?:(?:\d|[1-9]\d|1\d{2}|2[0-4]\d|25[0-5])\.){3}(?:\d|[1-9]\d|1\d{2}|2[0-4]\d|25[0-5])$/,
+  ipv6: /^((?=.*::)(?!.*::.+::)(::)?([\dA-F]{1,4}:(:|\b)|){5}|([\dA-F]{1,4}:){6})((([\dA-F]{1,4}((?!\3)::|:\b|$))|(?!\2\3)){2}|(((2[0-4]|1\d|[1-9])?\d|25[0-5])\.?\b){4})$/i
+};
+
+function not(func) {
+  return function () {
+    return !func.apply(null, Array.prototype.slice.call(arguments));
+  };
+}
+
+function existy(value) {
+  return value != null;
+}
+
+function ip(value) {
+  return existy(value) && regexes.ipv4.test(value) || regexes.ipv6.test(value);
+}
+
+function object(value) {
+  return Object(value) === value;
+}
+
+function string(value) {
+  return Object.prototype.toString.call(value) === '[object String]';
+}
+
+var is = {
+  existy: existy,
+  ip: ip,
+  object: object,
+  string: string,
+  not: {
+    existy: not(existy),
+    ip: not(ip),
+    object: not(object),
+    string: not(string)
+  }
+};
+module.exports = is;
\ No newline at end of file
diff --git a/package.json b/package.json
index 8750958..a1d273a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "request-ip",
-  "version": "3.1.0",
+  "version": "3.2.0",
   "description": "A small Node.js module to retrieve the request's IP address",
   "keywords": [
     "request ip",
@@ -49,9 +49,9 @@
   "files": [
     "dist"
   ],
-  "main": "./dist/index.js",
+  "main": "./lib/index.js",
   "scripts": {
-    "build": "babel ./src/index.js > ./dist/index.js",
+    "build": "babel src --out-dir lib",
     "changelog": "github_changelog_generator -u pbojinov -p request-ip",
     "coverage": "nyc report --reporter=text-lcov | coveralls",
     "test": "nyc --reporter=html --reporter=text --check-coverage --lines=100 --statements=100 tape ./test/*.js"