diff --git a/src/npm/colonesexchangerate.js b/src/npm/colonesexchangerate.mjs
similarity index 100%
rename from src/npm/colonesexchangerate.js
rename to src/npm/colonesexchangerate.mjs
diff --git a/src/npm/colonesexchangerate.test.js b/src/npm/colonesexchangerate.test.js
index 62b2677..c80cad5 100644
--- a/src/npm/colonesexchangerate.test.js
+++ b/src/npm/colonesexchangerate.test.js
@@ -1,5 +1,5 @@
 import assert from 'assert';
-import colonesexchangerate from './colonesexchangerate.js';
+import colonesexchangerate from './colonesexchangerate.mjs';
 
 let converter = new colonesexchangerate();
 
diff --git a/src/npm/package-lock.json b/src/npm/package-lock.json
index 18f88e7..aac13a6 100644
--- a/src/npm/package-lock.json
+++ b/src/npm/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@dsanchezcr/colonesexchangerate",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@dsanchezcr/colonesexchangerate",
-      "version": "1.1.0",
+      "version": "1.1.1",
       "license": "MIT",
       "dependencies": {
         "axios": "^1.6.2"
diff --git a/src/npm/package.json b/src/npm/package.json
index 4065728..91426e0 100644
--- a/src/npm/package.json
+++ b/src/npm/package.json
@@ -1,9 +1,9 @@
 {
   "name": "@dsanchezcr/colonesexchangerate",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "type": "module",
   "description": "Currency conversion from Colones (Costa Rica - CRC ₡) to Dollars (United States - USD $) and Euros (European Union - EUR €). It consumes the exchange rate API from Ministerio de Hacienda de Costa Rica.",
-  "main": "colonesexchangerate.js",
+  "main": "colonesexchangerate.mjs",
   "scripts": {
     "test": "node colonesexchangerate.test.js",
     "build": "echo 'No build step required'"