diff --git a/setup.cfg b/setup.cfg
index ef28b9f..35f88df 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,4 @@
 [sdist]
-formats = zip
 group = users
 
 [flake8]
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 1b6155f..0000000
--- a/setup.py
+++ /dev/null
@@ -1,40 +0,0 @@
-#! /usr/bin/env python
-#
-# setup.py -- ayame setup script
-#
-
-import sys
-
-from setuptools import setup, Command
-
-
-class test(Command):
-
-    description = 'run unit tests'
-    user_options = [('failfast', 'f', 'stop on first fail or error')]
-
-    boolean_options = ['failfast']
-
-    def initialize_options(self):
-        self.failfast = False
-
-    def finalize_options(self):
-        pass
-
-    def run(self):
-        import unittest
-
-        # run unittest discover
-        argv = [sys.argv[0], 'discover', '--start-directory', 'tests']
-        if self.verbose:
-            argv.append('--verbose')
-        if self.failfast:
-            argv.append('--failfast')
-        unittest.main(None, argv=argv)
-
-
-setup(
-    cmdclass={
-        'test': test,
-    },
-)
diff --git a/tox.ini b/tox.ini
index ef8d4fc..53346cc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,7 +12,7 @@ deps =
 commands =
 # test
     coverage erase
-    coverage run --source=ayame setup.py test {posargs:--quiet}
+    coverage run --source=ayame -m unittest discover -s tests {posargs}
     coverage report
 # lint
     flake8