diff --git a/shop/admin/delivery.py b/shop/admin/delivery.py
index f000061a0..18aeb1eec 100644
--- a/shop/admin/delivery.py
+++ b/shop/admin/delivery.py
@@ -185,7 +185,7 @@ def fulfilled(self, obj):
     fulfilled.short_description = _("Fulfilled at")
 
 
-class DeliveryOrderAdminMixin(object):
+class DeliveryOrderAdminMixin:
     """
     Add this mixin to the class defining the OrderAdmin
     """
diff --git a/shop/admin/order.py b/shop/admin/order.py
index ef20d0014..b6cd8bab6 100644
--- a/shop/admin/order.py
+++ b/shop/admin/order.py
@@ -198,7 +198,7 @@ def change_view(self, request, object_id, form_url='', extra_context=None):
         return response
 
 
-class PrintInvoiceAdminMixin(object):
+class PrintInvoiceAdminMixin:
     """
     A customized OrderAdmin class shall inherit from this mixin class, to add
     methods for printing the the invoice.
diff --git a/shop/admin/product.py b/shop/admin/product.py
index 6b2dc555e..2280fbc30 100644
--- a/shop/admin/product.py
+++ b/shop/admin/product.py
@@ -42,7 +42,7 @@ def label_from_instance(self, obj):
             return str(obj)
 
 
-class CMSPageAsCategoryMixin(object):
+class CMSPageAsCategoryMixin:
     """
     Add this mixin class to the ModelAdmin class for products wishing to be assigned to djangoCMS
     pages when used as categories.
diff --git a/shop/cascade/checkout.py b/shop/cascade/checkout.py
index 14139ba50..2434ec45b 100644
--- a/shop/cascade/checkout.py
+++ b/shop/cascade/checkout.py
@@ -310,7 +310,7 @@ def get_form_data(self, context, instance, placeholder):
 DialogFormPluginBase.register_plugin(ExtraAnnotationFormPlugin)
 
 
-class AcceptConditionMixin(object):
+class AcceptConditionMixin:
     render_template = 'shop/checkout/accept-condition.html'
 
     def render(self, context, instance, placeholder):
diff --git a/shop/cascade/extensions.py b/shop/cascade/extensions.py
index bf0d13df6..4545295b6 100644
--- a/shop/cascade/extensions.py
+++ b/shop/cascade/extensions.py
@@ -4,7 +4,7 @@
 from shop.cascade.plugin_base import ShopPluginBase
 
 
-class ShopExtendableMixin(object):
+class ShopExtendableMixin:
     """
     Add this mixin class to the list of ``model_mixins``, in the plugin class wishing to use extensions.
     """
@@ -25,7 +25,7 @@ def right_extension(self):
             return result[0]
 
 
-class LeftRightExtensionMixin(object):
+class LeftRightExtensionMixin:
     """
     Plugin classes wishing to use extensions shall inherit from this class.
     """
diff --git a/shop/conf.py b/shop/conf.py
index cab2ce4c8..7ab8d8725 100644
--- a/shop/conf.py
+++ b/shop/conf.py
@@ -1,4 +1,4 @@
-class DefaultSettings(object):
+class DefaultSettings:
     def _setting(self, name, default=None):
         from django.conf import settings
         return getattr(settings, name, default)
diff --git a/shop/deferred.py b/shop/deferred.py
index effb34228..6d9f36394 100644
--- a/shop/deferred.py
+++ b/shop/deferred.py
@@ -9,7 +9,7 @@
 from shop.conf import app_settings
 
 
-class DeferredRelatedField(object):
+class DeferredRelatedField:
     def __init__(self, to, **kwargs):
         try:
             self.abstract_model = to._meta.object_name
diff --git a/shop/forms/base.py b/shop/forms/base.py
index 87948d296..9d1712d85 100644
--- a/shop/forms/base.py
+++ b/shop/forms/base.py
@@ -110,7 +110,7 @@ def field_css_classes(self):
         return css_classes
 
 
-class UniqueEmailValidationMixin(object):
+class UniqueEmailValidationMixin:
     """
     A mixin added to forms which have to validate for the uniqueness of email addresses.
     """
diff --git a/shop/models/customer.py b/shop/models/customer.py
index e2b203efb..5261540c1 100644
--- a/shop/models/customer.py
+++ b/shop/models/customer.py
@@ -369,7 +369,7 @@ def delete(self, *args, **kwargs):
 CustomerModel = deferred.MaterializedModel(BaseCustomer)
 
 
-class VisitingCustomer(object):
+class VisitingCustomer:
     """
     This dummy object is used for customers which just visit the site. Whenever a VisitingCustomer
     adds something to the cart, this object is replaced against a real Customer object.
diff --git a/shop/models/inventory.py b/shop/models/inventory.py
index a168d0304..ae063b8b0 100644
--- a/shop/models/inventory.py
+++ b/shop/models/inventory.py
@@ -8,7 +8,7 @@
 from shop.exceptions import ProductNotAvailable
 
 
-class AvailableProductMixin(object):
+class AvailableProductMixin:
     """
     Add this mixin class to the product models declaration, wanting to keep track on the
     current amount of products in stock. In comparison to
diff --git a/shop/models/product.py b/shop/models/product.py
index e35b5246b..70d09c8dd 100644
--- a/shop/models/product.py
+++ b/shop/models/product.py
@@ -25,7 +25,7 @@
 from shop.exceptions import ProductNotAvailable
 
 
-class Availability(object):
+class Availability:
     """
     Contains the currently available quantity for a given product and period.
     """
@@ -59,7 +59,7 @@ def __init__(self, **kwargs):
         self.inventory = bool(kwargs.get('inventory', None))
 
 
-class AvailableProductMixin(object):
+class AvailableProductMixin:
     """
     Add this mixin class to the product models declaration, wanting to keep track on the
     current amount of products in stock. In comparison to
@@ -112,7 +112,7 @@ def check(cls, **kwargs):
         return errors
 
 
-class BaseReserveProductMixin(object):
+class BaseReserveProductMixin:
     def get_availability(self, request, **kwargs):
         """
         Returns the current available quantity for this product.
@@ -375,7 +375,7 @@ def invalidate_cache(self):
 ProductModel = deferred.MaterializedModel(BaseProduct)
 
 
-class CMSPageReferenceMixin(object):
+class CMSPageReferenceMixin:
     """
     Products which refer to CMS pages in order to emulate categories, normally need a method for
     being accessed directly through a canonical URL. Add this mixin class for adding a
diff --git a/shop/modifiers/base.py b/shop/modifiers/base.py
index bd5b5a4c6..adf50ead3 100644
--- a/shop/modifiers/base.py
+++ b/shop/modifiers/base.py
@@ -1,4 +1,4 @@
-class BaseCartModifier(object):
+class BaseCartModifier:
     """
     Cart Modifiers are the cart's counterpart to backends.
 
diff --git a/shop/modifiers/pool.py b/shop/modifiers/pool.py
index b090fbfaf..3a78a927b 100644
--- a/shop/modifiers/pool.py
+++ b/shop/modifiers/pool.py
@@ -2,7 +2,7 @@
 from shop.conf import app_settings
 
 
-class CartModifiersPool(object):
+class CartModifiersPool:
 
     USE_CACHE = True
 
diff --git a/shop/payment/providers.py b/shop/payment/providers.py
index dcc5917a3..663472028 100644
--- a/shop/payment/providers.py
+++ b/shop/payment/providers.py
@@ -2,7 +2,7 @@
 from shop.models.order import OrderModel
 
 
-class PaymentProvider(object):
+class PaymentProvider:
     """
     Base class for all Payment Service Providers.
     """
diff --git a/shop/payment/workflows.py b/shop/payment/workflows.py
index bd7e56611..b5914a7a5 100644
--- a/shop/payment/workflows.py
+++ b/shop/payment/workflows.py
@@ -5,7 +5,7 @@
 from shop.models.order import BaseOrder
 
 
-class ManualPaymentWorkflowMixin(object):
+class ManualPaymentWorkflowMixin:
     """
     Add this class to `settings.SHOP_ORDER_WORKFLOWS` to mix it into your `OrderModel`.
     It adds all the methods required for state transitions, when used with the
@@ -69,7 +69,7 @@ def payment_refunded(self):
         return 'refund_payment' if self.amount_paid else 'order_canceled'
 
 
-class CancelOrderWorkflowMixin(object):
+class CancelOrderWorkflowMixin:
     """
     Add this class to `settings.SHOP_ORDER_WORKFLOWS` to mix it into your `OrderModel`.
     It adds all the methods required for state transitions, to cancel an order.
diff --git a/shop/rest/renderers.py b/shop/rest/renderers.py
index cf90c84b9..5d7104bce 100644
--- a/shop/rest/renderers.py
+++ b/shop/rest/renderers.py
@@ -5,7 +5,7 @@
 from shop.serializers.cart import CartSerializer
 
 
-class TemplateContextMixin(object):
+class TemplateContextMixin:
     """
     Alternative implementation which does not pollute the template context with
     the serialized data on the root scope.
diff --git a/shop/shipping/workflows.py b/shop/shipping/workflows.py
index 21ee7b94b..2873b794d 100644
--- a/shop/shipping/workflows.py
+++ b/shop/shipping/workflows.py
@@ -6,7 +6,7 @@
 from shop.models.delivery import DeliveryModel, DeliveryItemModel
 
 
-class SimpleShippingWorkflowMixin(object):
+class SimpleShippingWorkflowMixin:
     """
     Workflow for simply marking the state of an Order while picking, packing and shipping items.
     It does not create a Delivery object.
diff --git a/shop/views/catalog.py b/shop/views/catalog.py
index 2ff59b536..dae4fab96 100644
--- a/shop/views/catalog.py
+++ b/shop/views/catalog.py
@@ -342,7 +342,7 @@ def get_queryset(self):
         return ProductModel.objects.all()
 
 
-class AddFilterContextMixin(object):
+class AddFilterContextMixin:
     """
     A mixin to enrich the render context by ``filter`` containing information
     on how to render the filter set, supplied by attribute ``filter_class``.