PUT method throws BadMethodCallException

I'm learning Laravel from Lacast and i'm trying to create a CRUD application.I've implemented the index,show,create and store correctly,but with the edit form when i try to submit data it's throwing BadMethodCallException. Here are my routes

Route::get('/projects','ProjectsController@index');
Route::get('/projects/{id}','ProjectsController@show')->where('id','[0-9]+');


Route::get('/create','ProjectsController@create');
Route::post('/projects','ProjectsController@store');

Route::get('/projects/{id}/edit','ProjectsController@edit')->where('id','[0-9]+');
Route::put('/projects/{id}','ProjectsController@update')->where('id','[0-9]+');

Route::delete('/projects/{id}','ProjectsController@destroy');

Here is the edit form:

@extends('template');
@section('content')
    <h2>Create new project</h2>
<p>/projects/</p>    
<form method="POST" action="/projects/">
        
        
        <div>
            <input value="" type="text" name="title" id="title" placeholder="Project title">
        </div>
        <div>
            <textarea  name="description" placeholder="Enter the project description"></textarea>
        </div>
        <div>
            <button type="submit">Update project</button>
        </div>
    </form>
@endsection

The controller code:

 public function edit($id){
        $project= Project::find($id);
        return view('projects.edit',compact('project'));
    }

    public function update($id){
        $project= Project::find($id);
        $project->title=request('title');
        $project->description('description');
        $project->save();
        return redirect('/projects');
    }

The edit form displays as expected with data coming from the database,after submit i get the following error page:

With the example of the instructor the code has worked perfectly,and before using the PUT either on my form and in my controller i used PATCH like the instructor but always the same result.

Here is the instructor video link: Faking PATCH and DELETE Requests

via Chebli Mohamed