diff --git a/CHANGELOG.md b/CHANGELOG.md
index b2a9d89..2e4bddb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 #### Date TBD
 
 * Use forkserver start method for multiprocessing by @eltoder in https://github.com/CleanCut/green/pull/296
+* Adjust to breaking changes in `setuptools` 72.0.0
 
 # Version 4.0.2
 #### 18 Apr 2024
diff --git a/Makefile b/Makefile
index df4db2d..5f19931 100644
--- a/Makefile
+++ b/Makefile
@@ -21,10 +21,16 @@ super-clean: super-clean-message clean-silent
 	@rm -rf venv*
 
 
-test: test-versions test-installed test-coverage
+test: test-mypy test-black test-versions test-installed test-coverage
 	@# test-coverage needs to be last in deps, don't clean after it runs!
 	@echo "\n(test) completed\n"
 
+test-mypy:
+	mypy green example
+
+test-black:
+	black --check --diff green example
+
 test-local:
 	@pip3 install --upgrade -e '.[dev]'
 	@make test-installed
diff --git a/green/command.py b/green/command.py
index f510a1a..da74f9f 100644
--- a/green/command.py
+++ b/green/command.py
@@ -62,11 +62,22 @@ def run(self) -> None:
 
         if self.distribution.install_requires:
             self.distribution.fetch_build_eggs(self.distribution.install_requires)
-        if self.distribution.tests_require:
+
+        # TODO: Remove this once setuptools >= 72.0.0 is ubiquitous, since it no longer supports the
+        # "test" subcommand
+        if (
+            hasattr(self.distribution, "tests_require")
+            and self.distribution.tests_require
+        ):
             self.distribution.fetch_build_eggs(self.distribution.tests_require)
 
+        # TODO: Remove this once setuptools >= 72.0.0 is ubiquitous, since it no longer supports the
+        # "test" subcommand
         script_args = self.distribution.script_args[1:]
-        if self.distribution.test_suite is not None:
+        if (
+            hasattr(self.distribution, "test_suite")
+            and self.distribution.test_suite is not None
+        ):
             script_args.append(self.distribution.test_suite)
 
         error_code = main(script_args)
diff --git a/green/process.py b/green/process.py
index febf2c1..130b129 100644
--- a/green/process.py
+++ b/green/process.py
@@ -64,8 +64,8 @@ def ddebug(msg: str, err: ExcInfoType | None = None) -> None:  # pragma: no cove
         error_string = "".join(traceback.format_exception(*err))
     else:
         error_string = ""
-    sys.__stdout__.write(f"({os.getpid()}) {msg} {error_string}\n")
-    sys.__stdout__.flush()
+    sys.__stdout__.write(f"({os.getpid()}) {msg} {error_string}\n")  # type: ignore
+    sys.__stdout__.flush()  # type: ignore
 
 
 class ProcessLogger:
diff --git a/green/test/test_command.py b/green/test/test_command.py
index 5130520..eec8c96 100644
--- a/green/test/test_command.py
+++ b/green/test/test_command.py
@@ -93,20 +93,6 @@ def test_initialize_options(self):
         for attr in ["completion_file", "clear_omit", "debug", "processes"]:
             self.assertTrue(hasattr(cmd, attr), attr)
 
-    @patch("green.command.main", return_value=0)
-    def test_run(self, main):
-        d = Distribution(
-            {
-                "script_name": "setup.py",
-                "script_args": ["green"],
-                "test_suite": "green.test.test_version",
-            }
-        )
-
-        cmd = command.green(d)
-        cmd.run()
-        main.assert_called_once_with(["green.test.test_version"])
-
     @patch("green.command.main", return_value=125)
     def test_run_exits(self, main):
         d = Distribution({"script_name": "setup.py", "script_args": ["green"]})
@@ -115,24 +101,3 @@ def test_run_exits(self, main):
         with self.assertRaises(SystemExit) as se:
             cmd.run()
         self.assertEqual(se.exception.code, 125)
-
-    @patch("green.command.main", return_value=0)
-    def test_requires(self, main):
-        d = Distribution(
-            {
-                "script_name": "setup.py",
-                "script_args": ["green"],
-                "install_requires": ["six"],
-                "tests_require": ["mock", "unittest2"],
-            }
-        )
-        d.fetch_build_eggs = MagicMock()
-        cmd = command.green(d)
-        cmd.run()
-
-        d.fetch_build_eggs.assert_has_calls(
-            [
-                call(["six"]),
-                call(["mock", "unittest2"]),
-            ]
-        )
diff --git a/test_versions b/test_versions
index 4c13b3b..9e9197c 100755
--- a/test_versions
+++ b/test_versions
@@ -73,13 +73,8 @@ for PYTHON_VERSION in ${PYTHON_VERSIONS} ; do
         exit 7
     fi
     hash -r
-    REQUIREMENTS_FILE="requirements-optional.txt"
-    if [ "${PYTHON}" == "pypy3" ] ; then
-        # `black` depends on `typed_ast` which isn't supported by pypy3. We can remove this once
-        # `black` starts depending on built-in `ast`
-        REQUIREMENTS_FILE="requirements.txt"
-    fi
-    ${VENV_DIR}/bin/pip install -r requirements-optional.txt | grep -Ev "Requirement already|however version|consider upgrading"
+    ${VENV_DIR}/bin/pip install -r requirements.txt | grep -Ev "Requirement already|however version|consider upgrading"
+    ${VENV_DIR}/bin/pip install -r requirements-dev.txt | grep -Ev "Requirement already|however version|consider upgrading"
     deactivate
 done