diff --git a/LICENSE b/LICENSE
index 2eac1c3..6a2e3d6 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-MIT License Copyright (c) 2018-2023 Manuel Barkhau (mbarkhau@gmail.com)
+MIT License Copyright (c) 2018-2024 Manuel Barkhau (mbarkhau@gmail.com)
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/pyproject.toml b/pyproject.toml
index 56d3f79..7dd6a02 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,8 @@
 [project]
 name = "bumpver"
 description = "Bump version numbers in project files."
-keywords=[
+readme = {file = "README.md", content-type = "text/markdown"}
+keywords = [
     "version",
     "bumpver",
     "calver",
@@ -10,7 +11,7 @@ keywords=[
     "bumpversion pep440",
 ]
 version = "2023.1129"
-license = "MIT"
+license = {file = "LICENSE"}
 requires-python = ">=3.9"
 authors = [
     {"author" = "Manuel Barkhau", "email" = "mbarkhau@gmail.com"},
@@ -39,16 +40,13 @@ dependencies = [
     "toml>=0.10.2",
     "typing>=3.10.0.0",
 ]
+[project.urls]
+homepage      = "https://github.com/mbarkhau/bumpver"
+repository    = "https://github.com/mbarkhau/bumpver"
 
+[project.scripts] # CLI
+bumpver = "bumpver.cli:cli"
 
-[tool.ruff]
-line-length = 110
-indent-width = 4
-
-[tool.ruff.format]
-quote-style = "single"
-indent-style = "space"
-docstring-code-format = true
 
 [dependency-groups]
 dev = [
@@ -91,6 +89,158 @@ integration = [
     "straitjacket>=202008.1016",
     "twine>=5.1.1",
     "types-click>=7.1.8",
-    "types-setuptools>=75.3.0.20241107",
     "types-toml>=0.10.8.20240310",
 ]
+
+[tool.ruff]
+line-length = 110
+indent-width = 4
+
+[tool.ruff.format]
+quote-style = "single"
+indent-style = "space"
+docstring-code-format = true
+
+
+[tool.mypy]
+check_untyped_defs     = true
+disallow_untyped_calls = true
+follow_imports         = "silent"
+strict_optional        = true
+error_summary          = false
+ignore_missing_imports = true
+show_error_codes       = true
+warn_unreachable       = true
+warn_return_any        = true
+warn_unused_ignores    = true
+warn_redundant_casts   = true
+
+
+[tool.isort]
+known_first_party = "bumpver"
+known_third_party = ["click","lexid", "packaging"]
+force_single_line = true
+length_sort       = true
+
+
+[flake8]
+max-line-length = 100
+max-complexity = 12
+ignore = [
+    "C812", # Missing trailing comma (handled by sjfmt)
+    "E201", # No whitespace after paren open "("
+    "E202", # No whitespace before paren ")"
+    "E203", # Whitespace before ":"
+    "E221", # Multiple spaces before operator
+    "E222", # Multiple spaces after operand
+    "E231", # Missing whitespace after ','
+    "E241", # Multiple spaces after ':'
+    "E251", # Spaces around keyword/parameter equals
+    "E272", # Multiple spaces before keyword
+    "E501", # Line too long (B950 is used instead)
+    "W503", # Line break before binary op
+    "W504", # Line break after binary op
+    "D100", # Missing docstring in public module
+    "D101", # Missing docstring in public class
+    "D102", # Missing docstring in public method
+    "D103", # Missing docstring in public function
+
+    # D104, # Missing docstring in public package
+    # D105, # Missing docstring in magic method
+    "D107",   # Missing docstring on __init__
+    "D202", # No blank lines allowed after function docstring
+    "D400", # First line should end in a period
+    "D401", # First line should be in imperative mood
+]
+select = ["A","AAA","D","C","E","F","W","H","B","D212","D404","D405","D406","B901","B950","YTT"]
+exclude = [".git", "__pycache__", ".eggs/", "dist/", ".mypy_cache"]
+
+
+[tool.pylint]
+score   = false
+reports = false
+jobs    = 4
+
+# Set the output format. Available formats are text, parseable, colorized,
+# msvs (visual studio) and html. You can also give a reporter class, eg
+# mypackage.mymodule.MyReporterClass.
+output-format = "colorized"
+
+# Maximum number of locals for function / method body
+max-locals = 17
+
+# Maximum number of arguments for function / method
+max-args = 9
+
+# Maximum number of branch for function / method body
+max-branches = 14
+
+good-names = ["logger","i","ex"]
+
+# These are packages that are implemented as c extensions and
+# which pylint cannot do introspection on.
+extension-pkg-whitelist = ["numpy","pandas","lxml","PIL","sklearn","pyblake2"]
+notes                   = ["TODO","FIXME","XXX","SLOW","BUG"]
+
+# similarities/duplicaition checker
+min-similarity-lines = 4
+ignore-comments      = true
+ignore-docstrings    = true
+ignore-imports       = true
+
+ignored-argument-names = ["args", "kwargs"]
+
+# https://pylint.pycqa.org/en/stable/technical_reference/features.html
+disable = [
+    "bad-continuation",
+    "bad-whitespace",
+    "line-too-long",
+    "logging-not-lazy",
+    "logging-fstring-interpolation",
+    "no-else-return",
+    "no-else-raise",
+    "too-few-public-methods",
+    "missing-docstring",
+    "missing-module-docstring",
+    "missing-class-docstring",
+    "missing-function-docstring",
+    "raise-missing-from",
+    "duplicate-code",
+    "ungrouped-imports",
+]
+
+generated-members = [
+    "(_replace|_asdict|_fields)", # members of typing.NamedTuple
+]
+
+
+[tool.pytest]
+addopts = [
+    "--doctest-modules",
+    "--ignore",
+    "test/fixtures/hooks",
+    "--ignore",
+    "compat_test/fixtures/hooks",
+]
+
+
+[bumpver]
+current_version = "2023.1129"
+version_pattern = "YYYY.BUILD[-TAG]"
+commit_message  = "bump {old_version} -> {new_version}"
+commit          = true
+tag             = true
+push            = true
+
+[bumpver.file_patterns]
+"bootstrapit.sh"          = 'PACKAGE_VERSION="{version}"'
+"setup.cfg"               = 'current_version = "{version}"'
+"pyproject.toml"          = 'current_version = "{version}"'
+"setup.py"                = 'version="{pep440_version}",$'
+"src/bumpver/__init__.py" = '^__version__ = "{version}"$'
+"src/bumpver/cli.py"      = '@click.version_option(version="{version}")'
+"README.md"               = [
+    # "\[CalVer {version}\]",
+    "img.shields.io/static/v1.svg?label=CalVer&message={version}&color=blue",
+    "Successfully installed bumpver-{pep440_version}",
+]
diff --git a/requirements/development.txt b/requirements/development.txt
deleted file mode 100644
index f729ddc..0000000
--- a/requirements/development.txt
+++ /dev/null
@@ -1,51 +0,0 @@
-# These dependencies are installed using:
-#
-#   pip install --upgrade
-#
-# This list should only contain packages related to
-# local development and debugging. It should not contain
-# any packages required for production, building or packaging
-
-# PuDB is a full-screen, console-based visual debugger for Python.
-# https://documen.tician.de/pudb/
-pudb
-
-# Quick-and-dirty debugging output for tired programmers
-# https://pypi.org/project/q/
-q
-
-# pretty-traceback manipulates Python tracebacks to make
-# them more readable.
-# https://pypi.org/project/pretty-traceback/
-pretty-traceback
-
-# Py-Spy: A sampling profiler for Python programs.
-# https://github.com/benfred/py-spy
-# This is good for coarse grained profiling (even on production)
-py-spy
-
-# SNAKEVIZ : A browser based viewer for the output of Python’s cProfile.
-# https://jiffyclub.github.io/snakeviz/
-# This is good for fine grained profiling (function level/micro optimizations)
-snakeviz
-
-# I've yet to find a decent memory profiler for python, feel free to
-# add one after you've tested it and found it to be actually useful.
-
-ipython     # nuff said
-
-
-# A command line utility to display dependency tree of the installed Python packages
-# https://github.com/naiquevin/pipdeptree
-#
-# For graph output you will need to:
-# $ sudo apt install -y graphviz
-# $ pipdeptree --graph-output svg > requirements/tree.svg
-pipdeptree
-graphviz
-
-# run failed tests first
-pytest-cache
-
-# to update the readme examples
-rich
diff --git a/requirements/integration.txt b/requirements/integration.txt
deleted file mode 100644
index db80116..0000000
--- a/requirements/integration.txt
+++ /dev/null
@@ -1,53 +0,0 @@
-# These dependencies are installed using:
-#
-#   pip install --upgrade
-#
-# This file should only declare dependencies related to code
-# formatting, linting, testing and packaging.
-#
-# No dependencies required for production should be listed here.
-
-# http://www.pydocstyle.org/en/4.0.0/release_notes.html
-# Support for Python 2.x and PyPy has been dropped (#340).
-pydocstyle<4
-
-pip
-flake8
-flake8-bugbear
-flake8-docstrings
-flake8-builtins
-flake8-comprehensions
-flake8-junit-report
-flake8-2020
-pylint==2.12.1
-pylint-ignore>=2020.1013
-isort
-
-mypy==1.4.1
-mypy-extensions==1.0.0
-types-setuptools
-types-toml
-types-click
-
-# http://doc.pytest.org/en/latest/py27-py34-deprecation.html
-# The pytest 4.6 series will be the last to support Python 2.7
-# and 3.4, and is scheduled to be released by mid-2019.
-# pytest 5.0 and onwards will support only Python 3.5+.
-pytest; python_version >= "3.5"
-pytest<5.0; python_version < "3.5"
-pytest-cov
-# https://github.com/pytest-dev/pytest-html/blob/master/CHANGES.rst
-# pytest-html 2.0+ doesn't support python2.7
-pytest-html<2.0; python_version < "3.5"
-pytest-html==3.2; python_version >= "3.5"
-
-readme_renderer[md]
-twine
-
-md-toc
-straitjacket>=v202008.1016
-pycalver
-lib3to6
-
-# needed for mypy coverage report
-lxml
diff --git a/requirements/pypi.txt b/requirements/pypi.txt
deleted file mode 100644
index 22000b9..0000000
--- a/requirements/pypi.txt
+++ /dev/null
@@ -1,17 +0,0 @@
-# These dependencies are installed using:
-#
-#   pip install --upgrade
-#
-# This list is the default package list. All pure python packages
-# for the production environment at runtime should be listed here.
-# Binary (non-pure) packages may also be listed here, but you
-# should see if there is a conda package that suits your needs.
-
-pathlib2; python_version < "3.4"
-typing; python_version < "3.5"
-click<8.0; python_version < "3.6"
-click; python_version >= "3.6"
-toml
-lexid
-colorama>=0.4
-enum34; python_version < "3.4"
diff --git a/requirements/vendor.txt b/requirements/vendor.txt
deleted file mode 100644
index 56ad1a1..0000000
--- a/requirements/vendor.txt
+++ /dev/null
@@ -1,23 +0,0 @@
-# These dependencies are installed using:
-#
-#   pip install --upgrade
-#   pip install --upgrade --no-deps --target vendor/
-#
-# Vendored dependencies are installed both in the virtual
-# environment as well as in the vendor/ directory. This way:
-#
-# 1. All transitive dependencies of a package are installed in
-#    the virtualenv (in the first installation step)
-# 2. If there is a binary version of the package available, it
-#    will be installed into the virtualenv
-# 3. In the third step only (--no-deps) the source version of
-#    the (--no-binary) package is installed to vendor/
-#
-# This allows us to:
-#
-# 1. Enable mypy to check modules of multiple packages.
-# 2. Easily navigate to the source of a vendored dependency
-# 3. Use binary versions packages instead of source versions of
-#    packages, simply by not including the vendor/ directory in
-#    the PYTHONPATH. The version from the virtualenv will then
-#    be loaded instead.
diff --git a/setup.cfg b/setup.cfg
index 2e7b69f..788d04c 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -20,7 +20,7 @@ warn_redundant_casts = True
 
 [tool:isort]
 known_first_party = bumpver
-known_third_party = click,pathlib2,lexid,pkg_resources
+known_third_party = click,lexid
 force_single_line = True
 length_sort = True
 
@@ -107,10 +107,6 @@ src/bumpver/__init__.py =
     ^__version__ = "{version}"$
 src/bumpver/cli.py =
     @click.version_option(version="{version}")
-LICENSE =
-    Copyright (c) 2018-YYYY
-license.header =
-    Copyright (c) 2018-YYYY
 README.md =
     \[CalVer {version}\]
     img.shields.io/static/v1.svg?label=CalVer&message={version}&color=blue
diff --git a/src/bumpver/config.py b/src/bumpver/config.py
index fd5e7c6..824b53e 100644
--- a/src/bumpver/config.py
+++ b/src/bumpver/config.py
@@ -13,7 +13,7 @@
 
 import toml
 
-from bumpver import pathlib as pl
+import pathlib as pl
 
 from . import utils
 from . import version
diff --git a/src/bumpver/hooks.py b/src/bumpver/hooks.py
index 6c9bb57..098135f 100644
--- a/src/bumpver/hooks.py
+++ b/src/bumpver/hooks.py
@@ -9,7 +9,7 @@
 import logging
 import subprocess as sp
 
-from bumpver import pathlib as pl
+import pathlib as pl
 
 logger = logging.getLogger("bumpver.hooks")
 
diff --git a/src/bumpver/pathlib.py b/src/bumpver/pathlib.py
deleted file mode 100644
index d0505d9..0000000
--- a/src/bumpver/pathlib.py
+++ /dev/null
@@ -1,12 +0,0 @@
-# This file is part of the bumpver project
-# https://github.com/mbarkhau/bumpver
-#
-# Copyright (c) 2018-2024 Manuel Barkhau (mbarkhau@gmail.com) - MIT License
-# SPDX-License-Identifier: MIT
-
-try:
-    from pathlib import Path
-except ImportError:
-    from pathlib2 import Path  # type: ignore
-
-__all__ = ['Path']
diff --git a/src/bumpver/rewrite.py b/src/bumpver/rewrite.py
index b6cf026..c72d831 100644
--- a/src/bumpver/rewrite.py
+++ b/src/bumpver/rewrite.py
@@ -6,7 +6,7 @@
 import typing as typ
 import difflib
 
-from bumpver import pathlib as pl
+import pathlib as pl
 
 from . import config
 from .patterns import Pattern