Object of type date is not JSON serializable, getting error in django templates

I am trying to dumps data to json in views.py. And send to django templates for javascript but getting error. models.py

class resource(models.Model):
 title=models.CharField(max_length=100)
 size=models.CharField( max_length=20, default="")
 desc=models.TextField(default="")
 file=models.FileField(default="", blank=True)
 url= models.URLField(max_length=200, blank=True)
 varient=models.CharField(max_length=100, default="")
 Brand = models.ForeignKey(brand,on_delete=models.CASCADE, default="")
 Model = models.ForeignKey(model,on_delete=models.CASCADE, default="")
 Categories = models.ForeignKey(category,on_delete=models.CASCADE, default="")
 update_at=models.DateField(auto_now=True)
 paymentvarified=models.BooleanField(default=False)
 slug=models.SlugField(default="", unique=True, blank=True)
 Tags = TaggableManager(blank=True) 

views.py

 data={
    'limitjsondata':json.dumps(list(resource.objects.values())),
    'get_pro':get_pro,
    'Resource':Resource,
    'pro_member':pro_members,
    }
return render(request, 'firmApp/download.html', data)

When I run server and go to specic page it through an error.

Object of type date is not JSON serializable

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