Can't access Update function of the controller Laravel

So when I try to access the update function inside a resource controller, when I hit submit to go there (posts/{id}) I go to the show function of the controller (witch has the same path (posts/{id}).
How can I go the the update path, and access the update function?

So here is the view with its from of the edit function, that will "update" the title:

@extends('layouts.app')

@section('content')

    <h1>Edit Post</h1>

    <form method="get" action="/posts/{{$post->id}}">
        @csrf
        <input type="hidden" name="_method" value="PUT">
        <input type="text" name="title" placeholder="Enter title" value="{{$post->title}}">
        <input type="submit" name="submit">
    </form>

@endsection

And here is the update function of the controller, that will get the values from the upper view and update the post with that id:

public function update(Request $request, $id)
{
    //
    $post = Post::findOrFail($id);
    $post->update($request->all());
    return redirect('/posts');
}

And this is the show function that is going to run after I hit submit, instead of the update:

public function show($id)
{
    //
    $post = Post::findOrFail($id);
    return view('posts.show', compact('post'));
}

The view of show function, in case you need it:

@extends('layouts.app')

@section('content')

    <h1>{{$post->title}}</h1>

@endsection

When I hit submit it should check first the update function of controller, and render its code, because both update function and show function have the same path posts/{id}.