How to update in one to one relation in laravel?

In my user model, I have the following code

 public function profile()
    {
        return $this->hasOne(UserProfile::class);
    }

In profile model,

public function user()
    {
        return $this->belongsTo(User::class);
    }

The create method is working, But when I try to update the profile with following code, It is creating a new profile and doesn’t update the profile information.

 $profile = new UserProfile();
        $profile->dob = '1999-03-20';
        $profile->bio = 'A professional programmer.';
        $profile->facebook = 'http://facebook.com/test/1';
        $profile->github = 'http://github.com/test/1';
        $profile->twitter = 'http://twitter.com/test/1';

        $user = User::find($userId);
        $res = $user->profile()->save($profile);

What is the correct method to update in One to One Relationship ?

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