Laravel 5 isDirty() always returns false

I want to check if the model has been changed with isDirty method, but always returns false.

This is my code :

 if (!is_null($partnersData)) {
        foreach ($partnersData as $partnerData) {
            $partner = Partner::find($partnerData['partner_id']);
            $partner->update($partnerData);

            if($partner->isDirty()){
                dd('true');
            }
        }
    }

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