diff --git a/beproud/__init__.py b/beproud/__init__.py
index 1a79358..e69de29 100644
--- a/beproud/__init__.py
+++ b/beproud/__init__.py
@@ -1,7 +0,0 @@
-# See http://peak.telecommunity.com/DevCenter/setuptools#namespace-packages
-try:
-    __import__('pkg_resources').declare_namespace(__name__)
-except ImportError:
-    from pkgutil import extend_path
-    __path__ = locals()['__path__'] # make PyFlakes happy
-    __path__ = extend_path(__path__, __name__)
diff --git a/beproud/django/__init__.py b/beproud/django/__init__.py
index 1a79358..e69de29 100644
--- a/beproud/django/__init__.py
+++ b/beproud/django/__init__.py
@@ -1,7 +0,0 @@
-# See http://peak.telecommunity.com/DevCenter/setuptools#namespace-packages
-try:
-    __import__('pkg_resources').declare_namespace(__name__)
-except ImportError:
-    from pkgutil import extend_path
-    __path__ = locals()['__path__'] # make PyFlakes happy
-    __path__ = extend_path(__path__, __name__)
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 14667d9..0000000
--- a/setup.py
+++ /dev/null
@@ -1,3 +0,0 @@
-from setuptools import setup
-
-setup(test_suite="tests.main")
diff --git a/test_settings.py b/test_settings.py
index 240e1cd..c2f24b9 100644
--- a/test_settings.py
+++ b/test_settings.py
@@ -1,3 +1,6 @@
+import os
+import celery
+
 # Django3では、標準のdjango.conf.global_settingsの定数をオーバーライドすると例外が発生する場合がある。
 # https://github.com/django/django/blob/70035fb0444ae7c01613374212ca5e3c27c9782c/django/conf/__init__.py#L188
 # そのため、testではdjango.conf.global_settingsを直接利用せず、このtest用settings定数を使用する。
@@ -9,12 +12,6 @@
     'beproud.django.notify',
 )
 
-# kombu.exceptions.EncodeError: Object of type User is not JSON serializable エラーを抑止する
-# (参考)
-#   https://github.com/celery/celery/issues/5922
-#   https://stackoverflow.com/questions/49373825/kombu-exceptions-encodeerror-user-is-not-json-serializable
-CELERY_TASK_SERIALIZER = "pickle"
-
 DATABASES = {
     'default': {
         'ENGINE': 'django.db.backends.sqlite3',
@@ -22,7 +19,6 @@
     }
 }
 
-import os
 BASE_PATH = os.path.dirname(__file__)
 
 TEMPLATES = [
@@ -33,8 +29,7 @@
         ],
     },
 ]
-
-CELERY_TASK_ALWAYS_EAGER = True
+USE_TZ = False # For Django 5.0+
 
 BPNOTIFY_MEDIA = {
     "news": {
@@ -55,6 +50,16 @@
 }
 BPNOTIFY_SETTINGS_STORAGE = 'beproud.django.notify.storage.db.DBStorage'
 
-# The name of the class to use to run the test suite
-TEST_RUNNER = 'django.test.runner.DiscoverRunner'
+# For Celery Tests
+app = celery.Celery()
+app.config_from_object('django.conf:settings', namespace='CELERY')
+app.autodiscover_tasks(lambda: INSTALLED_APPS)
 
+BROKER_BACKEND = 'memory'
+CELERY_TASK_ALWAYS_EAGER = True
+
+# kombu.exceptions.EncodeError: Object of type User is not JSON serializable エラーを抑止する
+# (参考)
+#   https://github.com/celery/celery/issues/5922
+#   https://stackoverflow.com/questions/49373825/kombu-exceptions-encodeerror-user-is-not-json-serializable
+CELERY_TASK_SERIALIZER = "pickle"
diff --git a/tests.py b/tests.py
deleted file mode 100644
index 8945737..0000000
--- a/tests.py
+++ /dev/null
@@ -1,46 +0,0 @@
-import os
-import sys
-import django
-import celery
-
-import test_settings
-
-BASE_PATH = os.path.dirname(__file__)
-
-
-def main():
-    """
-    Standalone django model test with a 'memory-only-django-installation'.
-    You can play with a django model without a complete django app installation.
-    http://www.djangosnippets.org/snippets/1044/
-    """
-
-    # Django標準のdjango.conf.global_settingsを設定してしまうと、
-    # Django3では、global_settingsの全ての定数を上書きする挙動になってしまい、
-    # Django3の仕様で、多重上書き禁止エラーが検知され、例外が発生する。
-    # (例) https://github.com/django/django/blob/70035fb0444ae7c01613374212ca5e3c27c9782c/django/conf/__init__.py#L188
-    # そのため、自前のテスト用settingsモジュール(test_settings.py)を設定する。
-    os.environ["DJANGO_SETTINGS_MODULE"] = "test_settings"
-
-    app = celery.Celery()
-    app.config_from_object('django.conf:settings', namespace='CELERY')
-    app.autodiscover_tasks(lambda: test_settings.INSTALLED_APPS)
-
-    django.setup()
-
-    from django.test.utils import get_runner
-
-    # test用のsettings情報を用いて、Djangoのtest runnerクラスを取得
-    TestRunner = get_runner(test_settings)
-
-    # test runnerオブジェクトを生成
-    test_runner = TestRunner()
-
-    # test runnerにbpnotifyの単体テストのPathを渡して、bpnotifyの単体テストを実行する
-    failures = test_runner.run_tests(['beproud.django.notify.tests'])
-
-    sys.exit(failures)
-
-
-if __name__ == '__main__':
-    main()
diff --git a/tox.ini b/tox.ini
index 3891b34..90d3805 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,8 +1,13 @@
 # content of: tox.ini , put in same dir as setup.py
 [tox]
-envlist = py{39,310,311}-dj{32,42}-celery{52,53},py312-dj42-celery53
+envlist = py{39,310,311,312}-dj42-celery53
 skipsdist = True
 
+[pytest]
+python_files = tests test_*.py *_tests.py
+django_find_project = false
+DJANGO_SETTINGS_MODULE = test_settings
+
 [testenv]
 basepython =
     py39: python3.9
@@ -15,11 +20,9 @@ deps =
     pytest-pythonpath
     setuptools
     six
-    dj32: Django>=3.2,<4.0
     dj42: Django>=4.2,<5.0
-    celery52: celery>=5.2,<5.3
     celery53: celery>=5.3,<5.4
-commands=python setup.py test
+commands=pytest {posargs}
 
 # tox-gh-actionsパッケージの設定
 [gh-actions]