Upgrade Twig 1.x.x to Twig 3.x.x

Question

I'm trying to upgrade Twig 1.13.2-DEV to 3.x but don't know how to do that as on their Website not clearly mentioned and they suggest to ask question on StackOverflow :)

I used Twig only with Symfony framework not with Custom PHP website, Right now I can see two directories in server

Twig
Twig-extensions

And inside /Twig/lib/Twig/Environment.php it display me the version

const VERSION = '1.13.2-DEV';

Can someone have idea how to upgrade Twig?

My project is not using composer.json but inside Twig folder I have this compsoer.json

"name": "twig/twig", "type": "library", "description": "Twig, the flexible, fast, and secure template language for PHP", "keywords": ["templating"], "homepage": "http://twig.sensiolabs.org", "license": "BSD-3-Clause", "authors": [ { "name": "Fabien Potencier", "email": "fabien@symfony.com" }, { "name": "Armin Ronacher", "email": "armin.ronacher@active-4.com" } ], "require": { "php": ">=5.2.4" }, "autoload": { "psr-0" : { "Twig_" : "lib/" } }, "extra": { "branch-alias": { "dev-master": "1.13-dev" } } }

Please add the content of your `composer.json` to your question. And about composer not being installed: please look how to install it, there are many questions about this. Never ask two questions in the same post. — Stephan Vierkant, Jan 15 '20 at 14:53
Does this answer your question? [How to update a single library with Composer?](https://stackoverflow.com/questions/16739998/how-to-update-a-single-library-with-composer) — Stephan Vierkant, Jan 16 '20 at 09:07
No this is not the answer of my question, I am seeking info to upgrade twig, not seeking for install one pakcage using compers :) — Muhammad Shahzad, Jan 16 '20 at 14:30
But Twig is a single library and you are using composer, aren't you? And as I said: please share your `composer.json` — Stephan Vierkant, Jan 16 '20 at 15:07
No my project is not using composer.json but inside Twig folder I have composer.js file, I have updated code. — Muhammad Shahzad, Jan 19 '20 at 06:54

Upgrade Twig 1.x.x to Twig 3.x.x

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