diff --git a/.github/workflows/python-app.yml b/.github/workflows/python-app.yml
index 746b259..ace5f57 100644
--- a/.github/workflows/python-app.yml
+++ b/.github/workflows/python-app.yml
@@ -27,4 +27,4 @@ jobs:
         python setup.py develop
     - name: Run Tests
       run: |
-        python setup.py test
+        python -m unittest discover -s tests -p "*.py"
diff --git a/.gitignore b/.gitignore
index 0dad1ea..9eeece8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,7 @@ __pycache__/
 # Distribution / packaging
 .Python
 env/
+venv/
 build/
 develop-eggs/
 dist/
diff --git a/README.md b/README.md
index ea04ba9..9f68b32 100644
--- a/README.md
+++ b/README.md
@@ -116,7 +116,7 @@ python setup.py develop
 ### Test
 
 ```bash
-python setup.py test
+python -m unittest discover -s tests -p "*.py"
 ```
 
 ## Maintainers
diff --git a/requirements-dev.txt b/requirements-dev.txt
index c03eb43..b347bbd 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,3 +1,3 @@
-Cython==0.29.33
-Sphinx==2.2.1
-sphinx-rtd-theme==0.4.3
+Cython==3.0.11
+Sphinx==8.1.1
+sphinx-rtd-theme==3.0.1
diff --git a/setup.py b/setup.py
index 094d47d..04e7700 100644
--- a/setup.py
+++ b/setup.py
@@ -65,7 +65,6 @@
     long_description=long_description,
     long_description_content_type="text/markdown",
     license="MIT License",
-    test_suite="tests.test_all",
     ext_modules=ext_modules,
     python_requires=">=3.5, <4",
     classifiers=[
diff --git a/tests/__init__.py b/tests/__init__.py
index e8919aa..56a8862 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,7 +1,4 @@
 import os
-import glob
-import unittest
-import importlib
 import functools
 import tempfile
 
@@ -17,13 +14,3 @@ def _wrapped(*args, **kwargs):
         finally:
             f.close()
     return _wrapped
-
-def test_all():
-    suite = unittest.TestSuite()
-    for fname in glob.glob(os.path.join(here, '*.py')):
-        if '__init__' in fname:
-            continue
-        module = importlib.import_module('tests.' + os.path.basename(fname).split('.py')[0])
-        if hasattr(module, 'suite'):
-            suite.addTest(module.suite())
-    return suite
diff --git a/tests/accuracytest.py b/tests/accuracytest.py
index e85bb27..a30bb1a 100644
--- a/tests/accuracytest.py
+++ b/tests/accuracytest.py
@@ -155,9 +155,10 @@ def _bf(self, error_rate):
 
 
 def suite():
-    suite = unittest.TestSuite()
-    suite.addTest(unittest.makeSuite(StringAccuracyMmapTestCase))
-    suite.addTest(unittest.makeSuite(StringAccuracyMallocTestCase))
-    suite.addTest(unittest.makeSuite(IntegerAccuracyMmapTestCase))
-    suite.addTest(unittest.makeSuite(IntegerAccuracyMallocTestCase))
-    return suite
+    loader = unittest.TestLoader()
+    return unittest.TestSuite((
+        loader.loadTestsFromTestCase(StringAccuracyMmapTestCase),
+        loader.loadTestsFromTestCase(StringAccuracyMallocTestCase),
+        loader.loadTestsFromTestCase(IntegerAccuracyMmapTestCase),
+        loader.loadTestsFromTestCase(IntegerAccuracyMallocTestCase),
+    ))
diff --git a/tests/simpletest.py b/tests/simpletest.py
index 83f908d..4423593 100755
--- a/tests/simpletest.py
+++ b/tests/simpletest.py
@@ -416,6 +416,5 @@ def test_pickle(self):
         self.assertEqual(bf.bit_array, unpickled.bit_array)
 
 def suite():
-    suite = unittest.TestSuite()
-    suite.addTest(unittest.makeSuite(SimpleTestCase))
-    return suite
+    loader = unittest.TestLoader()
+    return loader.loadTestsFromTestCase(SimpleTestCase)