Django rest swagger nested serializer showing list of array in Example UI

Django Rest Swagger is not able to parse the Inner Serializer as an array of objects instead it shows only list of string

My Serializers:

class InfluencerSerializer(serializers.Serializer):
     prices = PriceSerializer(many=True)
     first_name = serializer.CharField(max_length=100)

class PriceSerializer(serializers.Serializer):
     cost = serializers.IntegerField(default=0)

On Swagger UI it appears as below json in Example

{ 
  "first_name": "string", 
  "prices": ["string"],
}

While I am expected Swagger UI to show { "first_name": "string", "prices": [ {"cost":0} ], }

I am using

Django==1.10.6
djangorestframework==3.6.1
django-rest-swagger==2.1.2