Composer Autoload seems not to be working

I am using Sage 8.5.1, bedrock and trellis stack. I have installed roots/wp-password-bcrypt and indigotree/wp-bootstrap-nav-walker. Both of the show up in my required dependencies in my composer.json file
"require": {
“php”: “>=5.4.0”,
“composer/installers”: “~1.0”,
“roots/wp-password-bcrypt”: “^1.0”,
“indigotree/wp-bootstrap-nav-walker”: “^1.1”
}

and they are in my .lock file too. They don’t seem to be auto loading because when I call the nav walker class I get this error:
Fatal error: Uncaught Error: Class ‘IndigoTree\BootstrapNavWalker\Four\WalkerNavMenu’ not found in /srv/www/xxxyyyzzz.com/current/web/app/themes/roots/templates/header.php on line 27

This is my full composer.json file
{
“name”: “roots/sage”,
“type”: “wordpress-theme”,
“license”: “MIT”,
“description”: “The best WordPress starter theme with a modern front-end development workflow. Based on HTML5 Boilerplate, gulp, Bower, and Bootstrap.”,
“homepage”: “https://roots.io/sage/”,
“authors”: [
{
“name”: “Ben Word”,
“email”: "ben@benword.com",
“homepage”: “https://github.com/retlehs
},
{
“name”: “Scott Walkinshaw”,
“email”: "scott.walkinshaw@gmail.com",
“homepage”: “https://github.com/swalkinshaw
}
],
“keywords”: [
“wordpress”
],
“support”: {
“issues”: “https://github.com/roots/sage/issues”,
“forum”: “https://discourse.roots.io/
},
“require”: {
“php”: “>=5.4.0”,
“composer/installers”: “~1.0”,
“roots/wp-password-bcrypt”: “^1.0”,
“indigotree/wp-bootstrap-nav-walker”: “^1.1”
}
}

What am I missing???

If you’re using Bedrock, then add those to the Bedrock Composer file and install them.