diff --git a/README.rst b/README.rst
index 5b22333..a9037b1 100644
--- a/README.rst
+++ b/README.rst
@@ -5,7 +5,7 @@ and plugins from Python scripts.
 py2app is similar in purpose and design to py2exe for
 Windows.
 
-NOTE: py2app must be used on OSX to build applications,
+NOTE: py2app must be used on macOS to build applications,
 it cannot create Mac applications on other platforms.
 
 Project links
diff --git a/doc/changelog.rst b/doc/changelog.rst
index fdf653e..d9b8b82 100644
--- a/doc/changelog.rst
+++ b/doc/changelog.rst
@@ -4,6 +4,11 @@ Release history
 py2app 0.28
 -----------
 
+.. note:: 
+
+   This is the last version of py2app with compatibility with 
+   Python 2.7. Future versions will require Python 3.6 or later.
+
 * PR #410: Fix typo in NamedTemporyFile call
 
   PR by MAKOMO
diff --git a/py2app/_pkg_meta.py b/py2app/_pkg_meta.py
index 4bf0122..1bd2e7a 100644
--- a/py2app/_pkg_meta.py
+++ b/py2app/_pkg_meta.py
@@ -40,6 +40,7 @@ def update_metadata_cache_distinfo(infos, dist_info_path):
                     )
                 ] = dist_info_path
 
+
 def update_metadata_cache_distlink(infos, dist_link_path):
     """
     Update mapping from filename to dist_info directory
@@ -52,7 +53,6 @@ def update_metadata_cache_distlink(infos, dist_link_path):
     with open(dist_link_path, "r") as fp:
         dn = fp.readline()[:-1]
 
-
     # The list of files and directories that would have been
     # in the list of installed items.
     to_include = []
@@ -81,16 +81,22 @@ def update_metadata_cache_distlink(infos, dist_link_path):
     # the cache.
     add_recursive(infos, dist_info_path, to_include)
 
+
 def add_recursive(infos, dist_info_path, to_include):
-    """ Add items from to_include to infos, recursively 
-        walking into directories """
+    """Add items from to_include to infos, recursively
+    walking into directories"""
     for item in to_include:
         if os.path.isdir(item):
-            add_recursive(infos, dist_info_path, [os.path.join(item, fn) for fn in os.listdir(item)])
+            add_recursive(
+                infos,
+                dist_info_path,
+                [os.path.join(item, fn) for fn in os.listdir(item)],
+            )
 
         else:
             infos[item] = dist_info_path
 
+
 def scan_for_metadata(path):
     """
     Scan the importlib search path *path* for dist-info/egg-info
@@ -103,7 +109,7 @@ def scan_for_metadata(path):
             continue
         for nm in os.listdir(dirname):
             if nm.endswith(".egg-link"):
-                # Editable install, these will be found later on in 
+                # Editable install, these will be found later on in
                 # *path* as well, but contain metadata without a list
                 # of installed files.
                 update_metadata_cache_distlink(infos, os.path.join(dirname, nm))
diff --git a/py2app/apptemplate/lib/site.py b/py2app/apptemplate/lib/site.py
index c765f9e..ede88ff 100644
--- a/py2app/apptemplate/lib/site.py
+++ b/py2app/apptemplate/lib/site.py
@@ -193,11 +193,12 @@ def getusersitepackages():
 
 if sys.version_info[0] == 3:
     import builtins  # noqa: E402
+
     import _sitebuiltins  # noqa: E402
 
     builtins.help = _sitebuiltins._Helper()
-    builtins.quit = _sitebuiltins.Quitter('quit', 'Ctrl-D (i.e. EOF)')
-    builtins.exit = _sitebuiltins.Quitter('exit', 'Ctrl-D (i.e. EOF)')
+    builtins.quit = _sitebuiltins.Quitter("quit", "Ctrl-D (i.e. EOF)")
+    builtins.exit = _sitebuiltins.Quitter("exit", "Ctrl-D (i.e. EOF)")
 
 # Prefixes for site-packages; add additional prefixes like /usr/local here
 PREFIXES = [sys.prefix, sys.exec_prefix]
diff --git a/py2app/bootstrap/boot_aliasapp.py b/py2app/bootstrap/boot_aliasapp.py
index 81996b0..d54b864 100644
--- a/py2app/bootstrap/boot_aliasapp.py
+++ b/py2app/bootstrap/boot_aliasapp.py
@@ -1,7 +1,7 @@
 import re
 import sys
 
-cookie_re = re.compile(br"coding[:=]\s*([-\w.]+)")
+cookie_re = re.compile(rb"coding[:=]\s*([-\w.]+)")
 if sys.version_info[0] == 2:
     default_encoding = "ascii"
 else:
diff --git a/py2app/bootstrap/boot_aliasplugin.py b/py2app/bootstrap/boot_aliasplugin.py
index f7ecafa..479376f 100644
--- a/py2app/bootstrap/boot_aliasplugin.py
+++ b/py2app/bootstrap/boot_aliasplugin.py
@@ -1,7 +1,7 @@
 import re
 import sys
 
-cookie_re = re.compile(br"coding[:=]\s*([-\w.]+)")
+cookie_re = re.compile(rb"coding[:=]\s*([-\w.]+)")
 if sys.version_info[0] == 2:
     default_encoding = "ascii"
 else:
diff --git a/py2app/bootstrap/boot_app.py b/py2app/bootstrap/boot_app.py
index 484336d..cc30975 100644
--- a/py2app/bootstrap/boot_app.py
+++ b/py2app/bootstrap/boot_app.py
@@ -1,7 +1,7 @@
 import re
 import sys
 
-cookie_re = re.compile(br"coding[:=]\s*([-\w.]+)")
+cookie_re = re.compile(rb"coding[:=]\s*([-\w.]+)")
 if sys.version_info[0] == 2:
     default_encoding = "ascii"
 else:
diff --git a/py2app/bootstrap/boot_plugin.py b/py2app/bootstrap/boot_plugin.py
index 0f2581d..42e7280 100644
--- a/py2app/bootstrap/boot_plugin.py
+++ b/py2app/bootstrap/boot_plugin.py
@@ -1,7 +1,7 @@
 import re
 import sys
 
-cookie_re = re.compile(br"coding[:=]\s*([-\w.]+)")
+cookie_re = re.compile(rb"coding[:=]\s*([-\w.]+)")
 if sys.version_info[0] == 2:
     default_encoding = "ascii"
 else:
diff --git a/py2app/build_app.py b/py2app/build_app.py
index f57199d..62fb7d9 100644
--- a/py2app/build_app.py
+++ b/py2app/build_app.py
@@ -90,6 +90,7 @@
 else:
     sys_base_prefix = sys.prefix
 
+
 def finalize_distribution_options(dist):
     """
     setuptools.finalize_distribution_options extension
@@ -97,12 +98,11 @@ def finalize_distribution_options(dist):
     setuptools 61.
 
     This addin will set the name and py_modules attributes
-    when a py2app distribution is detected that does not 
+    when a py2app distribution is detected that does not
     yet have these attributes.
     are not already set
     """
-    if (getattr(dist, "app", None) is None and
-        getattr(dist, "plugin", None) is None):
+    if getattr(dist, "app", None) is None and getattr(dist, "plugin", None) is None:
         return
 
     if getattr(dist.metadata, "py_modules", None) is None:
@@ -310,7 +310,7 @@ def __init__(self, **kw):
             self.modules = [m]
 
     def __repr__(self):
-        return "<Target %s>"%(self.__dict__,)
+        return "<Target %s>" % (self.__dict__,)
 
     def get_dest_base(self):
         dest_base = getattr(self, "dest_base", None)
@@ -1186,7 +1186,6 @@ def process_recipes(self, mf, filters, flatpackages, loader_files):
             else:
                 break
 
-
     def _run(self):
         try:
             if self.alias:
diff --git a/py2app/bundletemplate/lib/site.py b/py2app/bundletemplate/lib/site.py
index d867838..0bd152a 100644
--- a/py2app/bundletemplate/lib/site.py
+++ b/py2app/bundletemplate/lib/site.py
@@ -198,8 +198,9 @@ def getusersitepackages():
     del sys.setdefaultencoding
 
 import builtins  # noqa: E402
+
 import _sitebuiltins  # noqa: E402
 
 builtins.help = _sitebuiltins._Helper()
-builtins.quit = _sitebuiltins.Quitter('quit', 'Ctrl-D (i.e. EOF)')
-builtins.exit = _sitebuiltins.Quitter('exit', 'Ctrl-D (i.e. EOF)')
+builtins.quit = _sitebuiltins.Quitter("quit", "Ctrl-D (i.e. EOF)")
+builtins.exit = _sitebuiltins.Quitter("exit", "Ctrl-D (i.e. EOF)")
diff --git a/py2app/recipes/PIL/__init__.py b/py2app/recipes/PIL/__init__.py
index bf00c27..2fc8919 100644
--- a/py2app/recipes/PIL/__init__.py
+++ b/py2app/recipes/PIL/__init__.py
@@ -56,7 +56,7 @@ def check(cmd, mf):
     s = StringIO("_recipes_pil_prescript(%r)\n" % list(plugins))
     print(plugins)
     plugins = set()
-    #sys.exit(1)
+    # sys.exit(1)
     for plugin in plugins:
         if have_PIL:
             mf.implyNodeReference(m, "PIL." + plugin)
diff --git a/py2app/recipes/black.py b/py2app/recipes/black.py
index 1fb86df..484b1ef 100644
--- a/py2app/recipes/black.py
+++ b/py2app/recipes/black.py
@@ -1,4 +1,5 @@
 import os
+
 from pkg_resources import get_distribution
 
 
@@ -7,8 +8,8 @@ def check(cmd, mf):
     if m is None or m.filename is None:
         return None
 
-    egg = get_distribution('black').egg_info
-    top = os.path.join(egg, 'top_level.txt')
+    egg = get_distribution("black").egg_info
+    top = os.path.join(egg, "top_level.txt")
 
     # These cannot be in zip
     packages = ["black", "blib2to3"]
@@ -16,11 +17,11 @@ def check(cmd, mf):
     # black may include optimized platform specific C extension which has
     # unusual name, e.g. 610faff656c4cfcbb4a3__mypyc; best to determine it from
     # the egg-info/top_level.txt
-    with open(top, 'r') as f:
-        includes = set(f.read().strip().split('\n'))
+    with open(top, "r") as f:
+        includes = set(f.read().strip().split("\n"))
     includes = list(includes.difference(packages))
 
     # Missed dependency
-    includes.append('pathspec')
+    includes.append("pathspec")
 
     return {"includes": includes, "packages": packages}
diff --git a/py2app/recipes/qt5.py b/py2app/recipes/qt5.py
index 639f594..1dfb4e8 100644
--- a/py2app/recipes/qt5.py
+++ b/py2app/recipes/qt5.py
@@ -34,7 +34,6 @@ def check(cmd, mf):
         except ImportError:
             mf.import_hook("sip", m, level=1)
 
-
         qtdir = QLibraryInfo.location(QLibraryInfo.LibrariesPath)
         if os.path.relpath(qtdir, os.path.dirname(PyQt5.__file__)).startswith("../"):
             # Qt5's prefix is not the PyQt5 package, which means
diff --git a/py2app/recipes/qt6.py b/py2app/recipes/qt6.py
index cc80bb4..b98086f 100644
--- a/py2app/recipes/qt6.py
+++ b/py2app/recipes/qt6.py
@@ -35,7 +35,9 @@ def check(cmd, mf):
             # Ensure that the Qt plugins are copied into the "Contents/plugins" folder,
             # that's where the bundles Qt expects them to be
             extra = {
-                "resources": [("..", [QLibraryInfo.path(QLibraryInfo.LibraryPath.PluginsPath)])]
+                "resources": [
+                    ("..", [QLibraryInfo.path(QLibraryInfo.LibraryPath.PluginsPath)])
+                ]
             }
 
         else:
@@ -51,7 +53,7 @@ def check(cmd, mf):
         except ImportError:
             mf.import_hook("sip", m, level=1)
 
-        reslt = {"packages": ["PyQt6"] }
+        reslt = {"packages": ["PyQt6"]}
         result.update(extra)
         return result
 
diff --git a/py2app/recipes/setuptools.py b/py2app/recipes/setuptools.py
index 5de491f..8610054 100644
--- a/py2app/recipes/setuptools.py
+++ b/py2app/recipes/setuptools.py
@@ -1,13 +1,14 @@
+import os
 import sys
 import textwrap
-import os
 
 if sys.version_info[0] == 2:
     from cStringIO import StringIO
 else:
     from io import StringIO
 
-PRESCRIPT=textwrap.dedent("""\
+PRESCRIPT = textwrap.dedent(
+    """\
     import pkg_resources, zipimport, os
 
     def find_eggs_in_zip(importer, path_item, only=False):
@@ -37,7 +38,8 @@ def _fixup_pkg_resources():
         list(map(pkg_resources.working_set.add_entry, sys.path))
 
     _fixup_pkg_resources()
-""")
+"""
+)
 
 
 def check(cmd, mf):
@@ -57,7 +59,8 @@ def check(cmd, mf):
     if os.path.exists(vendor_dir):
         for topdir, dirs, files in os.walk(vendor_dir):
             for fn in files:
-                if fn in ("__pycache__", "__init__.py"): continue
+                if fn in ("__pycache__", "__init__.py"):
+                    continue
 
                 relnm = os.path.relpath(os.path.join(topdir, fn), vendor_dir)
                 if relnm.endswith(".py"):
@@ -81,4 +84,7 @@ def check(cmd, mf):
     if sys.version[0] != 2:
         expected_missing_imports.add("__builtin__")
 
-    return {"expected_missing_imports": expected_missing_imports, "prescripts": [StringIO(PRESCRIPT)]}
+    return {
+        "expected_missing_imports": expected_missing_imports,
+        "prescripts": [StringIO(PRESCRIPT)],
+    }
diff --git a/py2app/util.py b/py2app/util.py
index 2b557b0..b6d852f 100644
--- a/py2app/util.py
+++ b/py2app/util.py
@@ -276,7 +276,6 @@ def in_system_path(filename):
     def fsencoding(s, encoding=sys.getfilesystemencoding()):  # noqa: M511,B008
         return macholib.util.fsencoding(s, encoding=encoding)
 
-
 else:
 
     def fsencoding(s, encoding=sys.getfilesystemencoding()):  # noqa: M511,B008
@@ -393,8 +392,9 @@ def byte_compile(
         if verbose:
             print("writing byte-compilation script")
         if not dry_run:
-            with NamedTemporaryFile(suffix=".py", delete=False, mode="w", 
-                    encoding="utf-8") as script:
+            with NamedTemporaryFile(
+                suffix=".py", delete=False, mode="w", encoding="utf-8"
+            ) as script:
                 script_name = script.name
                 script.write(
                     """
diff --git a/setup.py b/setup.py
index 548f046..9eabc7c 100644
--- a/setup.py
+++ b/setup.py
@@ -4,11 +4,11 @@
 import os
 import sys
 import unittest
-from distutils import log
 from fnmatch import fnmatch
 
 from setuptools import Command, find_packages, setup
 from setuptools.command import egg_info
+from distutils import log
 
 fp = open("README.rst")
 try:
@@ -23,7 +23,7 @@
     fp.close()
 
 CLASSIFIERS = [
-    "Development Status :: 4 - Beta",
+    "Development Status :: 5 - Production/Stable",
     "Environment :: Console",
     "Environment :: MacOS X :: Cocoa",
     "Intended Audience :: Developers",
@@ -291,7 +291,8 @@ def run(self):
     long_description_content_type="text/x-rst; charset=UTF-8",
     classifiers=CLASSIFIERS,
     keywords=[".app", "standalone"],
-    install_requires=["altgraph>=0.16", "modulegraph>=0.17", "macholib>=1.11"],
+    install_requires=["altgraph>=0.16", "modulegraph>=0.17", "macholib>=1.16"],
+    setup_requires=["altgraph>=0.16", "modulegraph>=0.17", "macholib>=1.16"],
     tests_require=["pyobjc"],
     cmdclass=cmdclass,
     packages=find_packages(exclude=["py2app_tests"]),
@@ -351,7 +352,9 @@ def run(self):
         ],
     },
     entry_points={
-        "setuptools.finalize_distribution_options": ["py2app = py2app.build_app:finalize_distribution_options"],
+        "setuptools.finalize_distribution_options": [
+            "py2app = py2app.build_app:finalize_distribution_options"
+        ],
         "distutils.commands": ["py2app = py2app.build_app:py2app"],
         "distutils.setup_keywords": [
             "app =    py2app.build_app:validate_target",
diff --git a/tox.ini b/tox.ini
index 3c362ed..396d12e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,6 +6,8 @@ envlist = isort,black,py37,py38,py39,py310,flake8
 # commands = {envbindir}/python -mcoverage run --parallel setup.py test --verbosity=3
 commands = {envbindir}/python setup.py test --verbosity=3
 deps =
+  macholib
+  modulegraph
   coverage
   pyobjc