diff --git a/Gtfsrt2LC.js b/Gtfsrt2LC.js
deleted file mode 100644
index 34c25a9..0000000
--- a/Gtfsrt2LC.js
+++ /dev/null
@@ -1,4 +0,0 @@
-module.exports = {
-    GtfsIndex: require('./lib/GtfsIndex.js'),
-    Gtfsrt2LC: require('./lib/Gtfsrt2LC'),
-};
diff --git a/bin/gtfsrt2json.js b/bin/gtfsrt2json.js
index 1fce163..5651dfc 100755
--- a/bin/gtfsrt2json.js
+++ b/bin/gtfsrt2json.js
@@ -1,7 +1,7 @@
 #!/usr/bin/env node
 
-const Gtfsrt2LC = require('../lib/Gtfsrt2LC');
-var program = require('commander');
+import { Gtfsrt2LC } from '../lib/Gtfsrt2LC.js';
+import { program } from 'commander';
 
 console.error("GTFS-RT to JSON converter use --help to discover how to use it");
 
@@ -10,16 +10,16 @@ program
     .option('-H --headers <headers>', 'Extra HTTP headers for requesting the gtfs files. E.g., {\\"some-header\\":\\"some-API-Key\\"}')
     .parse(process.argv);
 
-if (!program.realTime) {
+if (!program.opts().realTime) {
     console.error('Please provide a url or a path to a GTFS-RT feed');
     process.exit();
 }
 
 // Set HTTP custom headers, e.g., API keys
 var headers = {};
-if (program.headers) {
+if (program.opts().headers) {
     try {
-        headers = JSON.parse(program.headers);
+        headers = JSON.parse(program.opts().headers);
     } catch (err) {
         console.error('Please provide a valid JSON string for the extra HTTP headers');
         process.exit();
@@ -27,7 +27,7 @@ if (program.headers) {
 }
 
 async function parse() {
-    let gtfsrt2lc = new Gtfsrt2LC({ path: program.realTime, headers: headers });
+    let gtfsrt2lc = new Gtfsrt2LC({ path: program.opts().realTime, headers: headers });
     console.log(JSON.stringify(await gtfsrt2lc.parse2Json()));
 }
 
diff --git a/bin/gtfsrt2lc.js b/bin/gtfsrt2lc.js
index b9bf085..42f3233 100755
--- a/bin/gtfsrt2lc.js
+++ b/bin/gtfsrt2lc.js
@@ -1,10 +1,10 @@
 #!/usr/bin/env node
 
-const fs = require('fs');
-const GtfsIndex = require('../lib/GtfsIndex');
-const Gtfsrt2LC = require('../lib/Gtfsrt2LC');
-const { Level } = require('level');
-const program = require('commander');
+import fs from 'fs';
+import { GtfsIndex } from '../lib/GtfsIndex.js';
+import { Gtfsrt2LC } from '../lib/Gtfsrt2LC.js';
+import { Level } from 'level';
+import { program } from 'commander';
 
 program
     .option('-r --real-time <realTime>', 'URL/path to gtfs-rt feed')
@@ -18,27 +18,27 @@ program
     .option('-h --history <history>', 'Path to historic Connection LevelStore for differential updates')
     .parse(process.argv);
 
-if (!program.realTime) {
+if (!program.opts().realTime) {
     console.error('Please provide a url or a path to a GTFS-RT feed');
     console.error("GTFS-RT to linked connections converter use --help to discover how to use it");
     process.exit();
 }
 
-if (!program.static) {
+if (!program.opts().static) {
     console.error('Please provide a url or a path to a GTFS feed');
     console.error("GTFS-RT to linked connections converter use --help to discover how to use it");
     process.exit();
 }
 
-if (!program.store) {
-    program.store = 'MemStore';
+if (!program.opts().store) {
+    program.opts().store = 'MemStore';
 }
 
 // Load URIs template
 let template = null;
 try {
-    if (program.urisTemplate) {
-        template = JSON.parse(fs.readFileSync(program.urisTemplate, 'utf8'));
+    if (program.opts().urisTemplate) {
+        template = JSON.parse(fs.readFileSync(program.opts().urisTemplate, 'utf8'));
     }
 } catch (err) {
     console.error('Please provide a valid path to a template file');
@@ -46,12 +46,12 @@ try {
     process.exit();
 }
 // Get resulting data format
-const format = program.format || 'json';
+const format = program.opts().format || 'json';
 // Set HTTP custom headers, e.g., API keys
 let headers = {};
-if (program.headers) {
+if (program.opts().headers) {
     try {
-        headers = JSON.parse(program.headers);
+        headers = JSON.parse(program.opts().headers);
     } catch (err) {
         console.error(err);
         console.error('Please provide a valid JSON string for the extra HTTP headers');
@@ -62,13 +62,13 @@ if (program.headers) {
 
 // Load historic connections store (if any)
 let historyDB = null;
-if(program.history) {
-    historyDB = new Level(program.history, { valueEncoding: 'json' });
+if(program.opts().history) {
+    historyDB = new Level(program.opts().history, { valueEncoding: 'json' });
 }
 
 let t0 = new Date();
-const gtfsrt2lc = new Gtfsrt2LC({ path: program.realTime, uris: template, headers: headers });
-const gtfsIndexer = new GtfsIndex({ path: program.static, headers: headers });
+const gtfsrt2lc = new Gtfsrt2LC({ path: program.opts().realTime, uris: template, headers: headers });
+const gtfsIndexer = new GtfsIndex({ path: program.opts().static, headers: headers });
 
 async function processUpdate(store, grep, deduce) {
     console.error("Converting the GTFS-RT feed to Linked Connections");
@@ -99,4 +99,4 @@ async function processUpdate(store, grep, deduce) {
     }
 }
 
-processUpdate(program.store, program.grep, program.deduce);
\ No newline at end of file
+processUpdate(program.opts().store, program.opts().grep, program.opts().deduce);
\ No newline at end of file
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..5dc147c
--- /dev/null
+++ b/index.js
@@ -0,0 +1,4 @@
+import { GtfsIndex } from './lib/GtfsIndex.js';
+import { Gtfsrt2LC } from './lib/Gtfsrt2LC.js';
+
+export default { GtfsIndex, Gtfsrt2LC };
diff --git a/lib/Connections2JSONLD.js b/lib/Connections2JSONLD.js
index 389919c..02a4a17 100644
--- a/lib/Connections2JSONLD.js
+++ b/lib/Connections2JSONLD.js
@@ -1,6 +1,6 @@
 import { Transform } from 'stream';
 import utpl from 'uri-templates';
-import Utils from './Utils';
+import Utils from './Utils.js';
 
 export class Connections2JSONLD extends Transform {
     constructor(streamContext, templates) {
diff --git a/lib/Connections2Triples.js b/lib/Connections2Triples.js
index 009f2a8..c9cbd6a 100644
--- a/lib/Connections2Triples.js
+++ b/lib/Connections2Triples.js
@@ -1,6 +1,6 @@
 import { Transform } from 'stream';
 import utpl from 'uri-templates';
-import Utils from './Utils';
+import Utils from './Utils.js';
 import { DataFactory } from "rdf-data-factory";
 
 const df = new DataFactory();
diff --git a/lib/GtfsIndex.js b/lib/GtfsIndex.js
index c37ed6e..a310d04 100644
--- a/lib/GtfsIndex.js
+++ b/lib/GtfsIndex.js
@@ -6,7 +6,7 @@ import { parse as parseCsv } from 'fast-csv';
 import { deleteAsync as del } from 'del';
 import childProcess from 'child_process';
 import { Level } from 'level';
-import Utils from './Utils';
+import Utils from './Utils.js';
 
 const exec = util.promisify(childProcess.exec);
 
diff --git a/lib/Gtfsrt2LC.js b/lib/Gtfsrt2LC.js
index 59c5c59..36aaac3 100644
--- a/lib/Gtfsrt2LC.js
+++ b/lib/Gtfsrt2LC.js
@@ -8,9 +8,9 @@ import gtfsrtBindings from 'gtfs-realtime-bindings';
 import JSONStream from 'JSONStream';
 import { StreamWriter } from 'n3';
 import { format, addHours, addMinutes, addSeconds, addDays } from 'date-fns';
-import { Connections2JSONLD } from './Connections2JSONLD';
-import { Connections2CSV } from './Connections2CSV';
-import { Connections2Triples } from './Connections2Triples';
+import { Connections2JSONLD } from './Connections2JSONLD.js';
+import { Connections2CSV } from './Connections2CSV.js';
+import { Connections2Triples } from './Connections2Triples.js';
 
 const readFile = util.promisify(fs.readFile);
 const days = ['sunday', 'monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday'];
diff --git a/package-lock.json b/package-lock.json
index 8f2e922..533fa26 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "gtfsrt2lc",
-  "version": "2.2.0",
+  "version": "2.2.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "gtfsrt2lc",
-      "version": "2.2.0",
+      "version": "2.2.1",
       "license": "MIT",
       "dependencies": {
         "adm-zip": "^0.5.16",
diff --git a/package.json b/package.json
index 8af8fc1..db3a59c 100644
--- a/package.json
+++ b/package.json
@@ -1,8 +1,8 @@
 {
   "name": "gtfsrt2lc",
-  "version": "2.2.0",
+  "version": "2.2.1",
   "description": "Converts the GTFS-RT to Linked Connections",
-  "main": "./Gtfsrt2LC.js",
+  "main": "./index.js",
   "type": "module",
   "bin": {
     "gtfsrt2lc": "bin/gtfsrt2lc.js",