diff --git a/.coveragerc b/.coveragerc
deleted file mode 100644
index 59c5845..0000000
--- a/.coveragerc
+++ /dev/null
@@ -1,8 +0,0 @@
-[run]
-source = fillname
-       tests
-omit = */fillname/__main__.py
-[report]
-exclude_lines =
-    assert
-    nocoverage
diff --git a/.github/workflows/ci-test.yml b/.github/workflows/ci-test.yml
index 5accb48..7442528 100644
--- a/.github/workflows/ci-test.yml
+++ b/.github/workflows/ci-test.yml
@@ -23,10 +23,10 @@ jobs:
     - name: "checkout repository"
       uses: actions/checkout@v3
 
-    - name: "setup python 3.7"
+    - name: "setup python 3.9"
       uses: actions/setup-python@v4
       with:
-        python-version: 3.7
+        python-version: 3.9
 
     - name: "setup python 3.11"
       uses: actions/setup-python@v4
diff --git a/.isort.cfg b/.isort.cfg
deleted file mode 100644
index f238bf7..0000000
--- a/.isort.cfg
+++ /dev/null
@@ -1,2 +0,0 @@
-[settings]
-profile = black
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index dce9820..f7b3229 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -17,7 +17,6 @@ repos:
     rev: 5.11.5
     hooks:
       - id: isort
-        args: ["--profile", "black"]
         exclude: ^.github/
 
   - repo: https://github.com/psf/black
diff --git a/.pylintrc b/.pylintrc
deleted file mode 100644
index 82e3aa7..0000000
--- a/.pylintrc
+++ /dev/null
@@ -1,31 +0,0 @@
-[FORMAT]
-
-max-line-length=120
-
-[DESIGN]
-
-max-args=10
-max-attributes=7
-max-bool-expr=5
-max-branches=12
-max-locals=30
-max-parents=7
-max-public-methods=20
-max-returns=10
-max-statements=50
-min-public-methods=1
-
-[SIMILARITIES]
-
-ignore-comments=yes
-ignore-docstrings=yes
-ignore-imports=yes
-ignore-signatures=yes
-
-[BASIC]
-
-argument-rgx=^[a-z][a-z0-9]*((_[a-z0-9]+)*_?)?$
-variable-rgx=^[a-z][a-z0-9]*((_[a-z0-9]+)*_?)?$
-
-# Good variable names which should always be accepted, separated by a comma.
-good-names=_,M,N,B,A,Nn,Bn,An
diff --git a/init.py b/init.py
index 005bc2a..cdcd0bb 100755
--- a/init.py
+++ b/init.py
@@ -45,14 +45,14 @@ def replace(filepath):
 
     dirs = [os.path.join("src", "fillname"), "tests", "doc"]
     files = [
-        "setup.cfg",
+        ".pre-commit-config.yaml",
         "noxfile.py",
+        "pyproject.toml",
+        "setup.cfg",
         "CONTRIBUTING.md",
-        "README.md",
         "DEVELOPMENT.md",
         "LICENSE",
-        ".pre-commit-config.yaml",
-        ".coveragerc",
+        "README.md",
     ]
 
     for rootpath in dirs:
diff --git a/noxfile.py b/noxfile.py
index 22ee944..4d28f0c 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -2,12 +2,12 @@
 
 import nox
 
-nox.options.sessions = "lint_flake8", "lint_pylint", "typecheck", "test"
+nox.options.sessions = "lint_pylint", "typecheck", "test"
 
 EDITABLE_TESTS = True
 PYTHON_VERSIONS = None
 if "GITHUB_ACTIONS" in os.environ:
-    PYTHON_VERSIONS = ["3.7", "3.11"]
+    PYTHON_VERSIONS = ["3.9", "3.11"]
     EDITABLE_TESTS = False
 
 
@@ -90,15 +90,6 @@ def dev(session):
     session.install("-e", ".[dev]")
 
 
-@nox.session
-def lint_flake8(session):
-    """
-    Run flake8 linter.
-    """
-    session.install("-e", ".[lint_flake8]")
-    session.run("flake8", "src", "tests")
-
-
 @nox.session
 def lint_pylint(session):
     """
@@ -114,7 +105,7 @@ def typecheck(session):
     Typecheck the code using mypy.
     """
     session.install("-e", ".[typecheck]")
-    session.run("mypy", "-p", "fillname", "-p", "tests")
+    session.run("mypy", "--strict", "-p", "fillname", "-p", "tests")
 
 
 @nox.session(python=PYTHON_VERSIONS)
diff --git a/pyproject.toml b/pyproject.toml
index d214b53..74e9cab 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,3 +4,43 @@ requires = [
     "setuptools-scm",
 ]
 build-backend = "setuptools.build_meta"
+
+[tool.isort]
+profile = "black"
+line_length = 120
+
+[tool.black]
+line-length = 120
+
+[tool.pylint.format]
+max-line-length = 120
+
+[tool.pylint.design]
+max-args = 10
+max-attributes = 7
+max-bool-expr = 5
+max-branches = 12
+max-locals = 30
+max-parents = 7
+max-public-methods = 20
+max-returns = 10
+max-statements = 50
+min-public-methods = 1
+
+[tool.pylint.similarities]
+ignore-comments = true
+ignore-docstrings = true
+ignore-imports = true
+ignore-signatures = true
+
+[tool.pylint.basic]
+argument-rgx = "^[a-z][a-z0-9]*((_[a-z0-9]+)*_?)?$"
+variable-rgx = "^[a-z][a-z0-9]*((_[a-z0-9]+)*_?)?$"
+good-names = ["_"]
+
+[tool.coverage.run]
+source = ["fillname", "tests"]
+omit = ["*/fillname/__main__.py"]
+
+[tool.coverage.report]
+exclude_lines = ["assert", "nocoverage"]
diff --git a/setup.cfg b/setup.cfg
index b80a8bf..4b10be2 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -13,9 +13,8 @@ url = https://potassco.org/
 packages = find:
 package_dir =
     =src
+python_requires = >=3.9
 include_package_data = True
-install_requires =
-    importlib_metadata;python_version<'3.8'
 
 [options.packages.find]
 where = src
@@ -25,17 +24,13 @@ format =
     black
     isort
     autoflake
-lint_flake8 =
-    flake8
-    flake8-black
-    flake8-isort
 lint_pylint =
     pylint
 typecheck =
     types-setuptools
     mypy
 test =
-    coverage
+    coverage[toml]
 doc =
     sphinx
     furo
@@ -43,7 +38,7 @@ doc =
     sphinx_copybutton
     myst-parser
 dev =
-    fillname[test,typecheck,lint_pylint,lint_flake8]
+    fillname[test,typecheck,lint_pylint]
 
 [options.entry_points]
 console_scripts =
diff --git a/src/fillname/__main__.py b/src/fillname/__main__.py
index 13ea26c..5f48055 100644
--- a/src/fillname/__main__.py
+++ b/src/fillname/__main__.py
@@ -6,7 +6,7 @@
 from .utils.parser import get_parser
 
 
-def main():
+def main() -> None:
     """
     Run the main function.
     """
diff --git a/src/fillname/utils/logger.py b/src/fillname/utils/logger.py
index 5861879..a729a72 100644
--- a/src/fillname/utils/logger.py
+++ b/src/fillname/utils/logger.py
@@ -20,19 +20,22 @@ class SingleLevelFilter(logging.Filter):
     Filter levels.
     """
 
-    def __init__(self, passlevel, reject):
+    passlevel: int
+    reject: bool
+
+    def __init__(self, passlevel: int, reject: bool):
         # pylint: disable=super-init-not-called
         self.passlevel = passlevel
         self.reject = reject
 
-    def filter(self, record):
+    def filter(self, record: logging.LogRecord) -> bool:
         if self.reject:
             return record.levelno != self.passlevel  # nocoverage
 
         return record.levelno == self.passlevel
 
 
-def setup_logger(name, level):
+def setup_logger(name: str, level: int) -> logging.Logger:
     """
     Setup logger.
     """
@@ -42,13 +45,11 @@ def setup_logger(name, level):
     logger.setLevel(level)
     log_message_str = "{}%(levelname)s:{}  - %(message)s{}"
 
-    def set_handler(level, color):
+    def set_handler(level: int, color: str) -> None:
         handler = logging.StreamHandler(sys.stderr)
         handler.addFilter(SingleLevelFilter(level, False))
         handler.setLevel(level)
-        formatter = logging.Formatter(
-            log_message_str.format(COLORS[color], COLORS["GREY"], COLORS["NORMAL"])
-        )
+        formatter = logging.Formatter(log_message_str.format(COLORS[color], COLORS["GREY"], COLORS["NORMAL"]))
         handler.setFormatter(formatter)
         logger.addHandler(handler)
 
diff --git a/src/fillname/utils/parser.py b/src/fillname/utils/parser.py
index 8cde3d8..ad8e215 100644
--- a/src/fillname/utils/parser.py
+++ b/src/fillname/utils/parser.py
@@ -6,7 +6,7 @@
 import sys
 from argparse import ArgumentParser
 from textwrap import dedent
-from typing import Any, cast
+from typing import Any, Optional, cast
 
 __all__ = ["get_parser"]
 
@@ -39,7 +39,7 @@ def get_parser() -> ArgumentParser:
         ("debug", logging.DEBUG),
     ]
 
-    def get(levels, name):
+    def get(levels: list[tuple[str, int]], name: str) -> Optional[int]:
         for key, val in levels:
             if key == name:
                 return val
@@ -54,7 +54,5 @@ def get(levels, name):
         type=cast(Any, lambda name: get(levels, name)),
     )
 
-    parser.add_argument(
-        "--version", "-v", action="version", version=f"%(prog)s {VERSION}"
-    )
+    parser.add_argument("--version", "-v", action="version", version=f"%(prog)s {VERSION}")
     return parser
diff --git a/tests/test_main.py b/tests/test_main.py
index b1e7f19..c9dca4d 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -15,18 +15,19 @@ class TestMain(TestCase):
     Test cases for main application functionality.
     """
 
-    def test_logger(self):
+    def test_logger(self) -> None:
         """
         Test the logger.
         """
         log = setup_logger("global", logging.INFO)
         sio = StringIO()
         for handler in log.handlers:
+            assert isinstance(handler, logging.StreamHandler)
             handler.setStream(sio)
         log.info("test123")
         self.assertRegex(sio.getvalue(), "test123")
 
-    def test_parser(self):
+    def test_parser(self) -> None:
         """
         Test the parser.
         """