diff --git a/Lib/gflanguages/__init__.py b/Lib/gflanguages/__init__.py
index 68afcc06..2957742e 100644
--- a/Lib/gflanguages/__init__.py
+++ b/Lib/gflanguages/__init__.py
@@ -22,11 +22,10 @@
 import glob
 import os
 
+from gflanguages import languages_public_pb2
 from google.protobuf import text_format
 from pkg_resources import resource_filename
 
-from gflanguages import languages_public_pb2
-
 try:
     from ._version import version as __version__  # type: ignore
 except ImportError:
@@ -39,10 +38,10 @@ def LoadLanguages(base_dir=DATA_DIR):
     if base_dir is None:
         base_dir = DATA_DIR
 
-    languages_dir = os.path.join(base_dir, 'languages')
+    languages_dir = os.path.join(base_dir, "languages")
     langs = {}
-    for textproto_file in glob.iglob(os.path.join(languages_dir, '*.textproto')):
-        with open(textproto_file, 'r', encoding='utf-8') as f:
+    for textproto_file in glob.iglob(os.path.join(languages_dir, "*.textproto")):
+        with open(textproto_file, "r", encoding="utf-8") as f:
             language = text_format.Parse(f.read(), languages_public_pb2.LanguageProto())
             langs[language.id] = language
     return langs
@@ -52,10 +51,10 @@ def LoadScripts(base_dir=DATA_DIR):
     if base_dir is None:
         base_dir = DATA_DIR
 
-    scripts_dir = os.path.join(base_dir, 'scripts')
+    scripts_dir = os.path.join(base_dir, "scripts")
     scripts = {}
-    for textproto_file in glob.iglob(os.path.join(scripts_dir, '*.textproto')):
-        with open(textproto_file, 'r', encoding='utf-8') as f:
+    for textproto_file in glob.iglob(os.path.join(scripts_dir, "*.textproto")):
+        with open(textproto_file, "r", encoding="utf-8") as f:
             script = text_format.Parse(f.read(), languages_public_pb2.ScriptProto())
             scripts[script.id] = script
     return scripts
@@ -65,10 +64,10 @@ def LoadRegions(base_dir=DATA_DIR):
     if base_dir is None:
         base_dir = DATA_DIR
 
-    regions_dir = os.path.join(base_dir, 'regions')
+    regions_dir = os.path.join(base_dir, "regions")
     regions = {}
-    for textproto_file in glob.iglob(os.path.join(regions_dir, '*.textproto')):
-        with open(textproto_file, 'r', encoding='utf-8') as f:
+    for textproto_file in glob.iglob(os.path.join(regions_dir, "*.textproto")):
+        with open(textproto_file, "r", encoding="utf-8") as f:
             region = text_format.Parse(f.read(), languages_public_pb2.RegionProto())
             regions[region.id] = region
     return regions
diff --git a/dev-requirements.txt b/dev-requirements.txt
index 73b0496d..3bc644ab 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,2 +1,5 @@
 uharfbuzz
 youseedee
+black
+isort
+pytest
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
index 71dfb41d..67ea2c5f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1 @@
---index-url https://pypi.python.org/simple/
-protobuf==3.19.4
--e .
+protobuf==3.19.4
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 105379ec..3f66ae80 100644
--- a/setup.py
+++ b/setup.py
@@ -51,7 +51,7 @@
         'Programming Language :: Python :: 3'
     ],
     python_requires=">=3.7",
-    setup_requires=['setuptools_scm>=4,<6.1'],
+    setup_requires=['setuptools_scm'],
     install_requires=[
         # 3.7.0 fixed a bug on parsing some METADATA.pb files.
         # We cannot use v4 because our protobuf files have been compiled with v3.
diff --git a/tox.ini b/tox.ini
index fb30fc43..b4ac1c55 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,66 +1,23 @@
 [tox]
-envlist = py37, py38, py39, coverage, flake8, pylint
-
-[gh-actions]
-python =
-    3.7: py37, coverage, flake8, pylint
-    3.8: py38, coverage, flake8, pylint
-    3.9: py39, coverage, flake8, pylint
+envlist = lint, py3{7,8,9}
+skip_missing_interpreters = true
 
 [testenv]
 deps =
-    pytest
-    coverage
-    -rrequirements.txt
-    -rdev-requirements.txt
-commands = coverage run -m pytest {posargs}
-passenv = LD_LIBRARY_PATH LD_PRELOAD
-
-[testenv:coverage]
-deps = coverage
-skip_install = true
+    -r requirements.txt
+    -r dev-requirements.txt
+; download the latest pip, setuptools and wheel when creating the venv
+download = true
 commands =
-    coverage report
-    coverage html
-
-# Exclude a lot of tests here without turning them off in setup.cfg, because a
-# developer might want to see and fix them. This is more of a regression test.
-[testenv:flake8]
-deps =
-    flake8
-    sphinx
-    sphinx_rtd_theme
-    recommonmark
-commands = flake8 --count --show-source --statistics
+    pytest tests/
 
-# Same rationale as with flake8.
-[testenv:pylint]
+[testenv:lint]
+skip_install = true
 deps =
-    pylint
-    sphinx
-    sphinx_rtd_theme
-    recommonmark
-wont_fix = invalid-name,protected-access,too-many-lines
-maybe_someday = fixme,missing-docstring,line-too-long
-commands = pylint --disable={[testenv:pylint]wont_fix},{[testenv:pylint]maybe_someday} Lib/gflanguages
-
-[flake8]
-select = E,F,W
-
-exclude =
-# Exclude the entire build directory:
-    build
-# Exclude these auto-generated files that should not be hand-edited:
-    Lib/gflanguages/languages_public_pb2.py,
-# No need to traverse hidden directories such as .git, .tox
-    .*,
-# Exclude virtual environment directory:
-    venv*,
-# There's no value in checking cache directories
-    __pycache__,
-# The Sphinx configuration file is mostly autogenerated, ignore it
-    docs/source/conf.py,
+    -r dev-requirements.txt
+commands =
+    black --check --diff Lib/gflanguages --exclude .*pb2.py
+    isort --check-only Lib/gflanguages --skip Lib/gflanguages/languages_public_pb2.py
 
-max-line-length=100
-ignore = 
-    E126, # continuation line over-indented for hanging indent
+[isort]
+profile = black
\ No newline at end of file