Why does my django form with recaptcha send data even empty the recaptcha?

I put the google recaptcha V2 to my django project form. It looks like working, but if I leave empty the recaptcha checkbox my form is sent still.

forms.py

from django import

forms from captcha.fields

import ReCaptchaField

from django.forms import Textarea

from .models import *

class CustomerForm(forms.ModelForm):

    captcha = ReCaptchaField( public_key='key', private_key='key', )

    class Meta:

        model = Customer fields = '__all__'

    def __init__(self, *args, **kwargs):

        # get 'user' param from kwargs

        user = kwargs.pop('user', None)

        super().__init__(*args, **kwargs)

        self.fields['message'].widget = Textarea(attrs={'rows': 4})

        self.fields['i_have_read_rules'].widget.attrs['required'] = 'True'

        self.fields['i_agree'].widget.attrs['required'] = 'True'

        self.fields['captcha'].widget.attrs['required'] = 'True'

        for field in self.fields:

            self.fields[field].widget.attrs['class'] = 'form-control'

        self.fields['i_have_read_rules'].widget.attrs['class'] = 'form-check'

        self.fields['i_agree'].widget.attrs['class'] = 'form-check'

html

                <form id="add_form_order" method="post">

                    {% csrf_token %}

                    <h6 class="block-title">Выберите услугу</h6>

                    <div class="form-group">{{form.choice_services}}</div>

                    <div class="form-group">{{form.name}}</div>

                    <div class="form-group">{{form.telephone_number}}</div>

                    <div class="form-group">{{form.email}}</div>

                    <div class="form-group">{{form.message}}</div>

                    <div class="form-group">{{form.contact_text}}</div>

                                                                 {{ form.captcha }}

                </form>

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