diff --git a/django_admin_row_actions/admin.py b/django_admin_row_actions/admin.py
index cffbe6b..069032e 100644
--- a/django_admin_row_actions/admin.py
+++ b/django_admin_row_actions/admin.py
@@ -4,13 +4,11 @@
 from django.utils.safestring import mark_safe
 from django.utils.translation import gettext_lazy as _
 
-from six import string_types
-
 from .components import Dropdown
 from .views import ModelToolsView
 
 
-class AdminRowActionsMixin(object):
+class AdminRowActionsMixin:
 
     """ModelAdmin mixin to add row actions just like adding admin actions"""
 
@@ -19,22 +17,14 @@ class AdminRowActionsMixin(object):
 
     @property
     def media(self):
-        css = super(AdminRowActionsMixin, self).media._css
-        css['all'] = css.get('all', [])
-        css['all'].extend(["css/jquery.dropdown.min.css"])
-
-        js = super(AdminRowActionsMixin, self).media._js
-        js.extend(["js/jquery.dropdown.min.js",])
-
-        media = forms.Media(
-            css=css, js=js
+        return super().media + forms.Media(
+            css={'all': ["css/jquery.dropdown.min.css"]},
+            js=["js/jquery.dropdown.min.js"],
         )
 
-        return media
-
     def get_list_display(self, request):
         self._request = request
-        list_display = super(AdminRowActionsMixin, self).get_list_display(request)
+        list_display = super().get_list_display(request)
         if '_row_actions' not in list_display:
             list_display += ('_row_actions',)
         return list_display
@@ -50,14 +40,14 @@ def to_dict(tool_name):
         items = []
 
         row_actions = self.get_row_actions(obj)
-        url_prefix = '{}/'.format(obj.pk if includePk else '')
+        url_prefix = f'{obj.pk if includePk else ""}/'
 
         for tool in row_actions:
-            if isinstance(tool, string_types):  # Just a str naming a callable
+            if isinstance(tool, str):  # Just a str naming a callable
                 tool_dict = to_dict(tool)
                 items.append({
                     'label': tool_dict['label'],
-                    'url': '{}rowactions/{}/'.format(url_prefix, tool),
+                    'url': f'{url_prefix}rowactions/{tool}/',
                     'method': tool_dict.get('POST', 'GET')
                 })
 
@@ -66,9 +56,9 @@ def to_dict(tool_name):
                 if 'action' in tool:  # If 'action' is specified then use our generic url in preference to 'url' value
                     if isinstance(tool['action'], tuple):
                         self._named_row_actions[tool['action'][0]] = tool['action'][1]
-                        tool['url'] = '{}rowactions/{}/'.format(url_prefix, tool['action'][0])
+                        tool['url'] = f'{url_prefix}rowactions/{tool["action"][0]}/'
                     else:
-                        tool['url'] = '{}rowactions/{}/'.format(url_prefix, tool['action'])
+                        tool['url'] = f'{url_prefix}rowactions/{tool["action"]}/'
                 items.append(tool)
 
         return items
@@ -111,7 +101,7 @@ def get_urls(self):
 
         """Prepends `get_urls` with our own patterns"""
 
-        urls = super(AdminRowActionsMixin, self).get_urls()
+        urls = super().get_urls()
         return self.get_tool_urls() + urls
 
     ##################
@@ -126,7 +116,7 @@ def get_change_actions(self, request, object_id, form_url):
         # If we're also using django_object_actions
         # then try to reuse row actions as object actions
 
-        change_actions = super(AdminRowActionsMixin, self).get_change_actions(request, object_id, form_url)
+        change_actions = super().get_change_actions(request, object_id, form_url)
 
         # Make this reuse opt-in
         if getattr(self, 'reuse_row_actions_as_object_actions', False):
@@ -136,10 +126,10 @@ def get_change_actions(self, request, object_id, form_url):
 
             for row_action in row_actions:
                 # Object actions only supports strings as action indentifiers
-                if isinstance(row_action, string_types):
+                if isinstance(row_action, str):
                     change_actions.append(row_action)
                 elif isinstance(row_action, dict):
-                    if isinstance(row_action['action'], string_types):
+                    if isinstance(row_action['action'], str):
                         change_actions.append(row_action['action'])
                     elif isinstance(row_action['action'], tuple):
                         change_actions.append(str(row_action['action'][1]))
diff --git a/django_admin_row_actions/components.py b/django_admin_row_actions/components.py
index 3beb556..2e11b7c 100644
--- a/django_admin_row_actions/components.py
+++ b/django_admin_row_actions/components.py
@@ -2,7 +2,7 @@
 from django.template.loader import render_to_string
 
 
-class BaseComponent(object):
+class BaseComponent:
 
     template = None
     instances = []
@@ -15,7 +15,7 @@ def __init__(self, **kwargs):
 
     @classmethod
     def get_unique_id(cls):
-        return "{}-{}".format(cls.__name__.lower(), len(cls.instances))
+        return f'{cls.__name__.lower()}-{len(cls.instances)}'
 
     def render(self):
         return render_to_string(
@@ -24,13 +24,9 @@ def render(self):
             request=self.request
         )
 
-    def __unicode__(self):
+    def __str__(self):
         return self.render()
 
 
 class Dropdown(BaseComponent):
-
     template = 'django_admin_row_actions/dropdown.html'
-
-    def __init__(self, **kwargs):
-        super(Dropdown, self).__init__(**kwargs)
diff --git a/django_admin_row_actions/tests/__init__.py b/django_admin_row_actions/tests/__init__.py
deleted file mode 100644
index 33a7eba..0000000
--- a/django_admin_row_actions/tests/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-__author__ = 'andybaker'
diff --git a/django_admin_row_actions/tests/tests.py b/django_admin_row_actions/tests/tests.py
deleted file mode 100644
index 501deb7..0000000
--- a/django_admin_row_actions/tests/tests.py
+++ /dev/null
@@ -1,16 +0,0 @@
-"""
-This file demonstrates writing tests using the unittest module. These will pass
-when you run "manage.py test".
-
-Replace this with more appropriate tests for your application.
-"""
-
-from django.test import TestCase
-
-
-class SimpleTest(TestCase):
-    def test_basic_addition(self):
-        """
-        Tests that 1 + 1 always equals 2.
-        """
-        self.assertEqual(1 + 1, 2)
diff --git a/django_admin_row_actions/utils.py b/django_admin_row_actions/utils.py
index 12c6c63..552b336 100644
--- a/django_admin_row_actions/utils.py
+++ b/django_admin_row_actions/utils.py
@@ -20,7 +20,7 @@ def __init__(self, instance=None, *args, **kwargs):
             # we may be able to throw away all this logic
             model = instance._meta.concrete_model
         self._doa_instance = instance
-        super(QuerySetIsh, self).__init__(model, *args, **kwargs)
+        super().__init__(model, *args, **kwargs)
         self._result_cache = [instance]
 
     def _clone(self, *args, **kwargs):
diff --git a/django_admin_row_actions/views.py b/django_admin_row_actions/views.py
index 2e307b4..c0628a8 100644
--- a/django_admin_row_actions/views.py
+++ b/django_admin_row_actions/views.py
@@ -41,7 +41,7 @@ def get(self, request, **kwargs):
         if isinstance(ret, HttpResponse):
             response = ret
         else:
-            back = request.META['HTTP_REFERER']
+            back = request.headers['referer']
             response = HttpResponseRedirect(back)
             
         return response
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..4f12a8c
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,17 @@
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
+
+[tool.poetry]
+name = "django-admin-row-actions"
+description = "Add action buttons to individual rows in the Django Admin"
+readme = "README.md"
+version = "0.10.0"
+authors = [
+    "Andy Baker <andy@andybak.net>",
+]
+packages = [
+    { include = "django_admin_row_actions" },
+]
+homepage = "https://pypi.org/project/django-admin-row-actions/"
+repository = "https://github.com/DjangoAdminHackers/django-admin-row-actions"
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index b88034e..0000000
--- a/setup.cfg
+++ /dev/null
@@ -1,2 +0,0 @@
-[metadata]
-description-file = README.md
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 0bce719..0000000
--- a/setup.py
+++ /dev/null
@@ -1,23 +0,0 @@
-from setuptools import find_packages
-from setuptools import setup
-
-setup(
-    name='django-admin-row-actions',
-    version='0.0.6',
-    description='django admin row actions',
-    author='Andy Baker',
-    author_email='andy@andybak.net',
-    url='https://github.com/DjangoAdminHackers/django-admin-row-actions',
-    packages=find_packages(),
-    install_requires=[
-        'six',
-    ],
-    package_data={
-        'django_admin_row_actions': [
-            'static/css/*.css',
-            'static/js/*.js',
-            'templates/django_admin_row_actions/*.html',
-        ]
-    },
-    include_package_data=True,
-)