diff --git a/CHANGELOG.md b/CHANGELOG.md
index e78d2b7..d8c3939 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 # Changelog
 
+## v4.0.0
+
+### Features
+- Update `KR` zipcode regex [@rpaasche](https://github.com/rpaasche)
+
+### Miscellaneous
+- Update dev dependencies
+
+
 ## v3.1.0
 
 ### Features
diff --git a/dist/i18n-zipcodes.js b/dist/i18n-zipcodes.js
index d546672..65bcae2 100644
--- a/dist/i18n-zipcodes.js
+++ b/dist/i18n-zipcodes.js
@@ -1,4 +1,4 @@
-/*! i18n-zipcodes v3.1.0 - https://github.com/sarcadass/i18n-zipcodes */
+/*! i18n-zipcodes v4.0.0 - https://github.com/sarcadass/i18n-zipcodes */
 (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
 'use strict';
 
@@ -68,7 +68,6 @@ module.exports = {
 		ge: /^((\d{4})|(\d{6}))$/,
 		ie: /^(?:^[AC-FHKNPRTV-Y][0-9]{2}|D6W)[ -]?[0-9AC-FHKNPRTV-Y]{4}$/,
 		jp: /^\d{3}(-\d{4})?$/,
-		kr: /^\d{3}-\d{3}$/,
 		lv: /^([a-zA-Z]{2}-)?(\d{4})$/,
 		mv: /^\d{4,5}$/,
 		mt: /^[a-zA-Z]{3}\s\d{2,4}$/,
@@ -84,7 +83,7 @@ module.exports = {
 		countryCode: [
 			'is|mg'.split('|'),
 			'at|au|bd|be|bg|ch|cx|cy|dk|gl|gw|hu|li|lu|md|mk|mz|no|nz|ph|sd|si|tn|ve|xk|za'.split('|'),
-			'as|ba|cu|de|dz|ee|es|fi|fm|gf|gp|gt|gu|hr|ic|id|il|it|ke|kw|lt|ma|me|mh|mm|mp|mq|mx|my|pk|pm|pr|ps|pw|re|sa|sm|th|tr|ua|uy|vi|vn|yu|zm'.split('|'),
+			'as|ba|cu|de|dz|ee|es|fi|fm|gf|gp|gt|gu|hr|ic|id|il|it|ke|kr|kw|lt|ma|me|mh|mm|mp|mq|mx|my|pk|pm|pr|ps|pw|re|sa|sm|th|tr|ua|uy|vi|vn|yu|zm'.split('|'),
 			'am|az|bj|by|cn|co|in|kg|kz|mn|ro|rs|ru|sg|tj|tm|uz'.split('|'),
 			'cz|gr|se|sk'.split('|')
 		],
@@ -99,10 +98,10 @@ module.exports = {
 };
 
 },{}],3:[function(require,module,exports){
-(function (global){
+(function (global){(function (){
 var i18nZipcodes = require('./lib/i18n-zipcodes.js');
 
 global.window.i18nZipcodes = i18nZipcodes;
 
-}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
 },{"./lib/i18n-zipcodes.js":1}]},{},[3]);
diff --git a/dist/i18n-zipcodes.min.js b/dist/i18n-zipcodes.min.js
index b169f29..3d20dfb 100644
--- a/dist/i18n-zipcodes.min.js
+++ b/dist/i18n-zipcodes.min.js
@@ -1,2 +1,2 @@
-/*! i18n-zipcodes v3.1.0 - https://github.com/sarcadass/i18n-zipcodes */
-!function o(d,s,u){function p(i,e){if(!s[i]){if(!d[i]){var t="function"==typeof require&&require;if(!e&&t)return t(i,!0);if(a)return a(i,!0);var n=new Error("Cannot find module '"+i+"'");throw n.code="MODULE_NOT_FOUND",n}var r=s[i]={exports:{}};d[i][0].call(r.exports,function(e){return p(d[i][1][e]||e)},r,r.exports,o,d,s,u)}return s[i].exports}for(var a="function"==typeof require&&require,e=0;e<u.length;e++)p(u[e]);return p}({1:[function(e,i,t){"use strict";var s=e("./zipRegexLib.js");i.exports=function(e,i){var t,n,r,o,d="[i18n-zipcodes]";if("string"!=typeof e||"string"!=typeof i)throw d+" The arguments required are two strings: countryCode, zipCode.";if(t=e.trim().toLocaleLowerCase(),n=i.trim(),"uk"===t&&(t="gb"),"cs"===t)throw d+" Since v.3.0.0, 'CS' has been removed, use 'RS' and/or 'ME' instead.";if(void 0!==s.uniqueZip[t])r=s.uniqueZip[t];else for(o=0;s.commonZip.countryCode.length>o;o++)if(-1<s.commonZip.countryCode[o].indexOf(t)){r=s.commonZip.pattern[o];break}if(void 0!==r)return r.test(n);throw"No Regex corresponds to this country code"}},{"./zipRegexLib.js":2}],2:[function(e,i,t){"use strict";i.exports={uniqueZip:{ad:/^(([a-zA-Z]{2}\d{3})|(\d{4}))$/,ar:/^((\d{4})|([a-zA-Z]{1}\d{4}[a-zA-Z]{3}))$/,bm:/^[a-zA-Z]{2}\s\d{2}$/,bn:/^[a-zA-Z]{2}\d{4}$/,br:/^(\d{5})(-\d{3})?$/,ca:/^[ABCEGHJKLMNPRSTVXY]{1}\d{1}[A-Z]{1} *\d{1}[A-Z]{1}\d{1}$/,fo:/^([a-zA-Z]{2}-)?(\d{3})?$/,fr:/^((0[1-9])|([1-8][0-9])|(9[0-8])|(2A)|(2B))[0-9]{3}$/,gb:/^(([A-Z]{1,2}[0-9][A-Z0-9]?|ASCN|STHL|TDCU|BBND|[BFS]IQQ|PCRN|TKCA) ?[0-9][A-Z]{2}|BFPO ?[0-9]{1,4}|(KY[0-9]|MSR|VG|AI)[ -]?[0-9]{4}|[A-Z]{2} ?[0-9]{2}|GE ?CX|GIR ?0A{2}|SAN ?TA1)$/,ge:/^((\d{4})|(\d{6}))$/,ie:/^(?:^[AC-FHKNPRTV-Y][0-9]{2}|D6W)[ -]?[0-9AC-FHKNPRTV-Y]{4}$/,jp:/^\d{3}(-\d{4})?$/,kr:/^\d{3}-\d{3}$/,lv:/^([a-zA-Z]{2}-)?(\d{4})$/,mv:/^\d{4,5}$/,mt:/^[a-zA-Z]{3}\s\d{2,4}$/,nl:/^(\d{4})\s?[a-zA-Z]{2}$/,pl:/^\d{2}(-)?\d{3}$/,pt:/^\d{4}(-)?\d{3}$/,sz:/^[a-zA-Z]{1}\d{3}$/,tw:/^\d{3}(\d{2})?$/,us:/^\d{5}(-\d{4})?$/},commonZip:{countryCode:["is|mg".split("|"),"at|au|bd|be|bg|ch|cx|cy|dk|gl|gw|hu|li|lu|md|mk|mz|no|nz|ph|sd|si|tn|ve|xk|za".split("|"),"as|ba|cu|de|dz|ee|es|fi|fm|gf|gp|gt|gu|hr|ic|id|il|it|ke|kw|lt|ma|me|mh|mm|mp|mq|mx|my|pk|pm|pr|ps|pw|re|sa|sm|th|tr|ua|uy|vi|vn|yu|zm".split("|"),"am|az|bj|by|cn|co|in|kg|kz|mn|ro|rs|ru|sg|tj|tm|uz".split("|"),"cz|gr|se|sk".split("|")],pattern:[/^[0-9]{3}$/,/^[0-9]{4}$/,/^[0-9]{5}$/,/^[0-9]{6}$/,/^[0-9]{3}\s?[0-9]{2}$/]}}},{}],3:[function(t,e,i){(function(e){var i=t("./lib/i18n-zipcodes.js");e.window.i18nZipcodes=i}).call(this,"undefined"!=typeof global?global:"undefined"!=typeof self?self:"undefined"!=typeof window?window:{})},{"./lib/i18n-zipcodes.js":1}]},{},[3]);
\ No newline at end of file
+/*! i18n-zipcodes v4.0.0 - https://github.com/sarcadass/i18n-zipcodes */
+!function r(d,s,u){function a(i,e){if(!s[i]){if(!d[i]){var t="function"==typeof require&&require;if(!e&&t)return t(i,!0);if(p)return p(i,!0);var n=new Error("Cannot find module '"+i+"'");throw n.code="MODULE_NOT_FOUND",n}var o=s[i]={exports:{}};d[i][0].call(o.exports,function(e){return a(d[i][1][e]||e)},o,o.exports,r,d,s,u)}return s[i].exports}for(var p="function"==typeof require&&require,e=0;e<u.length;e++)a(u[e]);return a}({1:[function(e,i,t){"use strict";var s=e("./zipRegexLib.js");i.exports=function(e,i){var t,n,o,r,d="[i18n-zipcodes]";if("string"!=typeof e||"string"!=typeof i)throw d+" The arguments required are two strings: countryCode, zipCode.";if(t=e.trim().toLocaleLowerCase(),n=i.trim(),"uk"===t&&(t="gb"),"cs"===t)throw d+" Since v.3.0.0, 'CS' has been removed, use 'RS' and/or 'ME' instead.";if(void 0!==s.uniqueZip[t])o=s.uniqueZip[t];else for(r=0;s.commonZip.countryCode.length>r;r++)if(-1<s.commonZip.countryCode[r].indexOf(t)){o=s.commonZip.pattern[r];break}if(void 0!==o)return o.test(n);throw"No Regex corresponds to this country code"}},{"./zipRegexLib.js":2}],2:[function(e,i,t){"use strict";i.exports={uniqueZip:{ad:/^(([a-zA-Z]{2}\d{3})|(\d{4}))$/,ar:/^((\d{4})|([a-zA-Z]{1}\d{4}[a-zA-Z]{3}))$/,bm:/^[a-zA-Z]{2}\s\d{2}$/,bn:/^[a-zA-Z]{2}\d{4}$/,br:/^(\d{5})(-\d{3})?$/,ca:/^[ABCEGHJKLMNPRSTVXY]{1}\d{1}[A-Z]{1} *\d{1}[A-Z]{1}\d{1}$/,fo:/^([a-zA-Z]{2}-)?(\d{3})?$/,fr:/^((0[1-9])|([1-8][0-9])|(9[0-8])|(2A)|(2B))[0-9]{3}$/,gb:/^(([A-Z]{1,2}[0-9][A-Z0-9]?|ASCN|STHL|TDCU|BBND|[BFS]IQQ|PCRN|TKCA) ?[0-9][A-Z]{2}|BFPO ?[0-9]{1,4}|(KY[0-9]|MSR|VG|AI)[ -]?[0-9]{4}|[A-Z]{2} ?[0-9]{2}|GE ?CX|GIR ?0A{2}|SAN ?TA1)$/,ge:/^((\d{4})|(\d{6}))$/,ie:/^(?:^[AC-FHKNPRTV-Y][0-9]{2}|D6W)[ -]?[0-9AC-FHKNPRTV-Y]{4}$/,jp:/^\d{3}(-\d{4})?$/,lv:/^([a-zA-Z]{2}-)?(\d{4})$/,mv:/^\d{4,5}$/,mt:/^[a-zA-Z]{3}\s\d{2,4}$/,nl:/^(\d{4})\s?[a-zA-Z]{2}$/,pl:/^\d{2}(-)?\d{3}$/,pt:/^\d{4}(-)?\d{3}$/,sz:/^[a-zA-Z]{1}\d{3}$/,tw:/^\d{3}(\d{2})?$/,us:/^\d{5}(-\d{4})?$/},commonZip:{countryCode:["is|mg".split("|"),"at|au|bd|be|bg|ch|cx|cy|dk|gl|gw|hu|li|lu|md|mk|mz|no|nz|ph|sd|si|tn|ve|xk|za".split("|"),"as|ba|cu|de|dz|ee|es|fi|fm|gf|gp|gt|gu|hr|ic|id|il|it|ke|kr|kw|lt|ma|me|mh|mm|mp|mq|mx|my|pk|pm|pr|ps|pw|re|sa|sm|th|tr|ua|uy|vi|vn|yu|zm".split("|"),"am|az|bj|by|cn|co|in|kg|kz|mn|ro|rs|ru|sg|tj|tm|uz".split("|"),"cz|gr|se|sk".split("|")],pattern:[/^[0-9]{3}$/,/^[0-9]{4}$/,/^[0-9]{5}$/,/^[0-9]{6}$/,/^[0-9]{3}\s?[0-9]{2}$/]}}},{}],3:[function(t,e,i){(function(i){(function(){var e=t("./lib/i18n-zipcodes.js");i.window.i18nZipcodes=e}).call(this)}).call(this,"undefined"!=typeof global?global:"undefined"!=typeof self?self:"undefined"!=typeof window?window:{})},{"./lib/i18n-zipcodes.js":1}]},{},[3]);
\ No newline at end of file
diff --git a/package.json b/package.json
index f93e936..df2ecab 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "i18n-zipcodes",
-  "version": "3.1.0",
+  "version": "4.0.0",
   "description": "International zipcodes validator based on Regex for Node.js and the browser.",
   "keywords": [
     "i18n",