diff --git a/.drone.jsonnet b/.drone.jsonnet
index 11c11b7..7b868cf 100644
--- a/.drone.jsonnet
+++ b/.drone.jsonnet
@@ -1,4 +1,4 @@
-local PythonVersion(pyversion='3.5') = {
+local PythonVersion(pyversion='3.6') = {
   name: 'python' + std.strReplace(pyversion, '.', '') + '-pytest',
   image: 'python:' + pyversion,
   pull: 'always',
@@ -6,13 +6,13 @@ local PythonVersion(pyversion='3.5') = {
     PY_COLORS: 1,
   },
   commands: [
-    'pip install -r dev-requirements.txt -qq',
-    'pip install -qq .',
-    'git-batch --help',
-    'git-batch --version',
+    'pip install poetry poetry-dynamic-versioning -qq',
+    'poetry install -q',
+    'poetry version',
+    'poetry run git-batch --help',
   ],
   depends_on: [
-    'clone',
+    'fetch',
   ],
 };
 
@@ -25,6 +25,19 @@ local PipelineLint = {
     arch: 'amd64',
   },
   steps: [
+    {
+      name: 'yapf',
+      image: 'python:3.9',
+      environment: {
+        PY_COLORS: 1,
+      },
+      commands: [
+        'git fetch -tq',
+        'pip install poetry poetry-dynamic-versioning -qq',
+        'poetry install -q',
+        'poetry run yapf -dr ./gitbatch',
+      ],
+    },
     {
       name: 'flake8',
       image: 'python:3.9',
@@ -33,9 +46,10 @@ local PipelineLint = {
         PY_COLORS: 1,
       },
       commands: [
-        'pip install -r dev-requirements.txt -qq',
-        'pip install -qq .',
-        'flake8 ./gitbatch',
+        'git fetch -tq',
+        'pip install poetry poetry-dynamic-versioning -qq',
+        'poetry install -q',
+        'poetry run flake8 ./gitbatch',
       ],
     },
   ],
@@ -53,7 +67,13 @@ local PipelineTest = {
     arch: 'amd64',
   },
   steps: [
-    PythonVersion(pyversion='3.5'),
+    {
+      name: 'fetch',
+      image: 'python:3.9',
+      commands: [
+        'git fetch -tq',
+      ],
+    },
     PythonVersion(pyversion='3.6'),
     PythonVersion(pyversion='3.7'),
     PythonVersion(pyversion='3.8'),
@@ -84,9 +104,10 @@ local PipelineSecurity = {
         PY_COLORS: 1,
       },
       commands: [
-        'pip install -r dev-requirements.txt -qq',
-        'pip install -qq .',
-        'bandit -r ./gitbatch -x ./gitbatch/tests',
+        'git fetch -tq',
+        'pip install poetry poetry-dynamic-versioning -qq',
+        'poetry install -q',
+        'poetry run bandit -r ./gitbatch -x ./gitbatch/test',
       ],
     },
   ],
@@ -111,7 +132,9 @@ local PipelineBuildPackage = {
       name: 'build',
       image: 'python:3.9',
       commands: [
-        'python setup.py sdist bdist_wheel',
+        'git fetch -tq',
+        'pip install poetry poetry-dynamic-versioning -qq',
+        'poetry build',
       ],
     },
     {
@@ -137,12 +160,15 @@ local PipelineBuildPackage = {
     },
     {
       name: 'publish-pypi',
-      image: 'plugins/pypi',
-      settings: {
-        username: { from_secret: 'pypi_username' },
-        password: { from_secret: 'pypi_password' },
-        repository: 'https://upload.pypi.org/legacy/',
-        skip_build: true,
+      image: 'python:3.9',
+      commands: [
+        'git fetch -tq',
+        'pip install poetry poetry-dynamic-versioning -qq',
+        'poetry publish -n',
+      ],
+      environment: {
+        POETRY_HTTP_BASIC_PYPI_USERNAME: { from_secret: 'pypi_username' },
+        POETRY_HTTP_BASIC_PYPI_PASSWORD: { from_secret: 'pypi_password' },
       },
       when: {
         ref: ['refs/tags/**'],
@@ -171,7 +197,9 @@ local PipelineBuildContainer(arch='amd64') = {
       image: 'python:3.9',
       pull: 'always',
       commands: [
-        'python setup.py bdist_wheel',
+        'git fetch -tq',
+        'pip install poetry poetry-dynamic-versioning -qq',
+        'poetry build',
       ],
     },
     {
@@ -179,6 +207,7 @@ local PipelineBuildContainer(arch='amd64') = {
       image: 'plugins/docker:19',
       pull: 'always',
       settings: {
+        config: { from_secret: 'docker_config' },
         dry_run: true,
         dockerfile: 'docker/Dockerfile',
         repo: 'thegeeklab/git-batch',
diff --git a/.drone.yml b/.drone.yml
index d37d28b..d69c09d 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -7,13 +7,24 @@ platform:
   arch: amd64
 
 steps:
+- name: yapf
+  image: python:3.9
+  commands:
+  - git fetch -tq
+  - pip install poetry poetry-dynamic-versioning -qq
+  - poetry install -q
+  - poetry run yapf -dr ./gitbatch
+  environment:
+    PY_COLORS: 1
+
 - name: flake8
   pull: always
   image: python:3.9
   commands:
-  - pip install -r dev-requirements.txt -qq
-  - pip install -qq .
-  - flake8 ./gitbatch
+  - git fetch -tq
+  - pip install poetry poetry-dynamic-versioning -qq
+  - poetry install -q
+  - poetry run flake8 ./gitbatch
   environment:
     PY_COLORS: 1
 
@@ -35,70 +46,62 @@ platform:
   arch: amd64
 
 steps:
-- name: python35-pytest
-  pull: always
-  image: python:3.5
+- name: fetch
+  image: python:3.9
   commands:
-  - pip install -r dev-requirements.txt -qq
-  - pip install -qq .
-  - git-batch --help
-  - git-batch --version
-  environment:
-    PY_COLORS: 1
-  depends_on:
-  - clone
+  - git fetch -tq
 
 - name: python36-pytest
   pull: always
   image: python:3.6
   commands:
-  - pip install -r dev-requirements.txt -qq
-  - pip install -qq .
-  - git-batch --help
-  - git-batch --version
+  - pip install poetry poetry-dynamic-versioning -qq
+  - poetry install -q
+  - poetry version
+  - poetry run git-batch --help
   environment:
     PY_COLORS: 1
   depends_on:
-  - clone
+  - fetch
 
 - name: python37-pytest
   pull: always
   image: python:3.7
   commands:
-  - pip install -r dev-requirements.txt -qq
-  - pip install -qq .
-  - git-batch --help
-  - git-batch --version
+  - pip install poetry poetry-dynamic-versioning -qq
+  - poetry install -q
+  - poetry version
+  - poetry run git-batch --help
   environment:
     PY_COLORS: 1
   depends_on:
-  - clone
+  - fetch
 
 - name: python38-pytest
   pull: always
   image: python:3.8
   commands:
-  - pip install -r dev-requirements.txt -qq
-  - pip install -qq .
-  - git-batch --help
-  - git-batch --version
+  - pip install poetry poetry-dynamic-versioning -qq
+  - poetry install -q
+  - poetry version
+  - poetry run git-batch --help
   environment:
     PY_COLORS: 1
   depends_on:
-  - clone
+  - fetch
 
 - name: python39-pytest
   pull: always
   image: python:3.9
   commands:
-  - pip install -r dev-requirements.txt -qq
-  - pip install -qq .
-  - git-batch --help
-  - git-batch --version
+  - pip install poetry poetry-dynamic-versioning -qq
+  - poetry install -q
+  - poetry version
+  - poetry run git-batch --help
   environment:
     PY_COLORS: 1
   depends_on:
-  - clone
+  - fetch
 
 image_pull_secrets:
 - docker_config
@@ -125,9 +128,10 @@ steps:
   pull: always
   image: python:3.9
   commands:
-  - pip install -r dev-requirements.txt -qq
-  - pip install -qq .
-  - bandit -r ./gitbatch -x ./gitbatch/tests
+  - git fetch -tq
+  - pip install poetry poetry-dynamic-versioning -qq
+  - poetry install -q
+  - poetry run bandit -r ./gitbatch -x ./gitbatch/test
   environment:
     PY_COLORS: 1
 
@@ -155,7 +159,9 @@ steps:
 - name: build
   image: python:3.9
   commands:
-  - python setup.py sdist bdist_wheel
+  - git fetch -tq
+  - pip install poetry poetry-dynamic-versioning -qq
+  - poetry build
 
 - name: checksum
   image: alpine
@@ -178,13 +184,15 @@ steps:
     - refs/tags/**
 
 - name: publish-pypi
-  image: plugins/pypi
-  settings:
-    password:
+  image: python:3.9
+  commands:
+  - git fetch -tq
+  - pip install poetry poetry-dynamic-versioning -qq
+  - poetry publish -n
+  environment:
+    POETRY_HTTP_BASIC_PYPI_PASSWORD:
       from_secret: pypi_password
-    repository: https://upload.pypi.org/legacy/
-    skip_build: true
-    username:
+    POETRY_HTTP_BASIC_PYPI_USERNAME:
       from_secret: pypi_username
   when:
     ref:
@@ -215,12 +223,16 @@ steps:
   pull: always
   image: python:3.9
   commands:
-  - python setup.py bdist_wheel
+  - git fetch -tq
+  - pip install poetry poetry-dynamic-versioning -qq
+  - poetry build
 
 - name: dryrun
   pull: always
   image: plugins/docker:19
   settings:
+    config:
+      from_secret: docker_config
     dockerfile: docker/Dockerfile
     dry_run: true
     password:
@@ -300,12 +312,16 @@ steps:
   pull: always
   image: python:3.9
   commands:
-  - python setup.py bdist_wheel
+  - git fetch -tq
+  - pip install poetry poetry-dynamic-versioning -qq
+  - poetry build
 
 - name: dryrun
   pull: always
   image: plugins/docker:19
   settings:
+    config:
+      from_secret: docker_config
     dockerfile: docker/Dockerfile
     dry_run: true
     password:
@@ -385,12 +401,16 @@ steps:
   pull: always
   image: python:3.9
   commands:
-  - python setup.py bdist_wheel
+  - git fetch -tq
+  - pip install poetry poetry-dynamic-versioning -qq
+  - poetry build
 
 - name: dryrun
   pull: always
   image: plugins/docker:19
   settings:
+    config:
+      from_secret: docker_config
     dockerfile: docker/Dockerfile
     dry_run: true
     password:
@@ -555,6 +575,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: 40231bb97e628b0d1b3bc75425ce214b28c0c5bcba2b72c0d49c18e2a0d222a5
+hmac: 4e584a0541cf28a67c24b61a955fcfeacd37a768a8f99f280b1dc572501fe5d3
 
 ...
diff --git a/.flake8 b/.flake8
index 83ef6c0..9de460d 100644
--- a/.flake8
+++ b/.flake8
@@ -1,18 +1,3 @@
 [flake8]
-ignore = D102, D103, D107, D202, W503
-max-line-length = 99
-inline-quotes = double
-exclude =
-    .git
-    .tox
-    __pycache__
-    build
-    dist
-    tests
-    *.pyc
-    *.egg-info
-    .cache
-    .eggs
-    env*
-application-import-names = ansiblelater
-format = ${cyan}%(path)s:%(row)d:%(col)d${reset}: ${red_bold}%(code)s${reset} %(text)s
+# Requires `flake8-colors`. This is the formatting suggested by the package (and used in flake8 repository itself).
+format = ${cyan}%(path)s${reset}:${yellow_bold}%(row)d${reset}:${green_bold}%(col)d${reset}: ${red_bold}%(code)s${reset} %(text)s
diff --git a/LICENSE b/LICENSE
index 1475a9a..44e4d67 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,9 +1,21 @@
 MIT License
 
-Copyright (c) 2019 Robert Kaussow
+Copyright (c) 2020 Robert Kaussow <mail@thegeeklab.de>
 
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
 
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/dev-requirements.txt b/dev-requirements.txt
deleted file mode 100644
index ea113a4..0000000
--- a/dev-requirements.txt
+++ /dev/null
@@ -1,19 +0,0 @@
-pydocstyle
-flake8
-flake8-colors
-flake8-blind-except
-flake8-builtins
-flake8-docstrings
-flake8-isort
-flake8-logging-format
-flake8-polyfill
-flake8-quotes
-flake8-pep3101
-flake8-eradicate; python_version >= "3.6"
-pep8-naming
-wheel
-pytest
-pytest-mock
-pytest-cov
-bandit
-yapf
diff --git a/gitbatch/__init__.py b/gitbatch/__init__.py
index 2df6f2b..0bca9b7 100644
--- a/gitbatch/__init__.py
+++ b/gitbatch/__init__.py
@@ -1,9 +1,3 @@
 """Default package."""
 
-__author__ = "Robert Kaussow"
-__project__ = "git-batch"
-__version__ = "0.3.1"
-__license__ = "MIT"
-__maintainer__ = "Robert Kaussow"
-__email__ = "mail@thegeeklab.de"
-__url__ = "https://github.com/thegeeklab/git-batch"
+__version__ = "0.0.0"
diff --git a/gitbatch/__main__.py b/gitbatch/__main__.py
deleted file mode 100644
index c28c00c..0000000
--- a/gitbatch/__main__.py
+++ /dev/null
@@ -1,12 +0,0 @@
-#!/usr/bin/env python3
-"""Main program."""
-
-from gitbatch.Cli import GitBatch
-
-
-def main():
-    GitBatch()
-
-
-if __name__ == "__main__":
-    main()
diff --git a/gitbatch/Cli.py b/gitbatch/cli.py
similarity index 97%
rename from gitbatch/Cli.py
rename to gitbatch/cli.py
index ff1352a..e33d6d3 100644
--- a/gitbatch/Cli.py
+++ b/gitbatch/cli.py
@@ -9,9 +9,9 @@ from urllib.parse import urlparse
 import git
 
 from gitbatch import __version__
-from gitbatch.Logging import SingleLog
-from gitbatch.Utils import normalize_path
-from gitbatch.Utils import to_bool
+from gitbatch.logging import SingleLog
+from gitbatch.utils import normalize_path
+from gitbatch.utils import to_bool
 
 
 class GitBatch:
@@ -130,3 +130,7 @@ class GitBatch:
                     os.path.relpath(os.path.join("./", self.config["input_file"]))
                 )
             )
+
+
+def main():
+    GitBatch()
diff --git a/gitbatch/Logging.py b/gitbatch/logging.py
similarity index 98%
rename from gitbatch/Logging.py
rename to gitbatch/logging.py
index a1c562f..1c12861 100644
--- a/gitbatch/Logging.py
+++ b/gitbatch/logging.py
@@ -8,8 +8,8 @@ import sys
 import colorama
 from pythonjsonlogger import jsonlogger
 
-from gitbatch.Utils import Singleton
-from gitbatch.Utils import to_bool
+from gitbatch.utils import Singleton
+from gitbatch.utils import to_bool
 
 CONSOLE_FORMAT = "{}[%(levelname)s]{} %(message)s"
 JSON_FORMAT = "(asctime) (levelname) (message)"
diff --git a/gitbatch/Utils.py b/gitbatch/utils.py
similarity index 100%
rename from gitbatch/Utils.py
rename to gitbatch/utils.py
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..868f962
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,935 @@
+[[package]]
+name = "atomicwrites"
+version = "1.4.0"
+description = "Atomic file writes."
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[[package]]
+name = "attrs"
+version = "20.3.0"
+description = "Classes Without Boilerplate"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[package.extras]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "furo", "sphinx", "pre-commit"]
+docs = ["furo", "sphinx", "zope.interface"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]
+
+[[package]]
+name = "bandit"
+version = "1.7.0"
+description = "Security oriented static analyser for python code."
+category = "dev"
+optional = false
+python-versions = ">=3.5"
+
+[package.dependencies]
+colorama = {version = ">=0.3.9", markers = "platform_system == \"Windows\""}
+GitPython = ">=1.0.1"
+PyYAML = ">=5.3.1"
+six = ">=1.10.0"
+stevedore = ">=1.20.0"
+
+[[package]]
+name = "certifi"
+version = "2020.12.5"
+description = "Python package for providing Mozilla's CA Bundle."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "chardet"
+version = "4.0.0"
+description = "Universal encoding detector for Python 2 and 3"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[[package]]
+name = "colorama"
+version = "0.4.4"
+description = "Cross-platform colored terminal text."
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[[package]]
+name = "coverage"
+version = "5.3.1"
+description = "Code coverage measurement for Python"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
+
+[package.extras]
+toml = ["toml"]
+
+[[package]]
+name = "eradicate"
+version = "2.0.0"
+description = "Removes commented-out code."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "flake8"
+version = "3.8.4"
+description = "the modular source code checker: pep8 pyflakes and co"
+category = "dev"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+
+[package.dependencies]
+importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
+mccabe = ">=0.6.0,<0.7.0"
+pycodestyle = ">=2.6.0a1,<2.7.0"
+pyflakes = ">=2.2.0,<2.3.0"
+
+[[package]]
+name = "flake8-blind-except"
+version = "0.1.1"
+description = "A flake8 extension that checks for blind except: statements"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "flake8-builtins"
+version = "1.5.3"
+description = "Check for python builtins being used as variables or parameters."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+flake8 = "*"
+
+[package.extras]
+test = ["coverage", "coveralls", "mock", "pytest", "pytest-cov"]
+
+[[package]]
+name = "flake8-colors"
+version = "0.1.9"
+description = "Error highlight plugin for Flake8."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+flake8 = ">3.0.0"
+
+[[package]]
+name = "flake8-docstrings"
+version = "1.5.0"
+description = "Extension for flake8 which uses pydocstyle to check docstrings"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+flake8 = ">=3"
+pydocstyle = ">=2.1"
+
+[[package]]
+name = "flake8-eradicate"
+version = "1.0.0"
+description = "Flake8 plugin to find commented out code"
+category = "dev"
+optional = false
+python-versions = ">=3.6,<4.0"
+
+[package.dependencies]
+attrs = "*"
+eradicate = ">=2.0,<3.0"
+flake8 = ">=3.5,<4.0"
+
+[[package]]
+name = "flake8-isort"
+version = "4.0.0"
+description = "flake8 plugin that integrates isort ."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+flake8 = ">=3.2.1,<4"
+isort = ">=4.3.5,<6"
+testfixtures = ">=6.8.0,<7"
+
+[package.extras]
+test = ["pytest (>=4.0.2,<6)", "toml"]
+
+[[package]]
+name = "flake8-logging-format"
+version = "0.6.0"
+description = "Flake8 extension to validate (lack of) logging format strings"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "flake8-pep3101"
+version = "1.3.0"
+description = "Checks for old string formatting."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+flake8 = ">=3.0"
+
+[package.extras]
+test = ["pytest", "testfixtures"]
+
+[[package]]
+name = "flake8-polyfill"
+version = "1.0.2"
+description = "Polyfill package for Flake8 plugins"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+flake8 = "*"
+
+[[package]]
+name = "flake8-quotes"
+version = "3.2.0"
+description = "Flake8 lint for quotes."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+flake8 = "*"
+
+[[package]]
+name = "gitdb"
+version = "4.0.5"
+description = "Git Object Database"
+category = "main"
+optional = false
+python-versions = ">=3.4"
+
+[package.dependencies]
+smmap = ">=3.0.1,<4"
+
+[[package]]
+name = "gitpython"
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+]
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+    {file = "pyflakes-2.2.0.tar.gz", hash = "sha256:35b2d75ee967ea93b55750aa9edbbf72813e06a66ba54438df2cfac9e3c27fc8"},
+]
+pyparsing = [
+    {file = "pyparsing-2.4.7-py2.py3-none-any.whl", hash = "sha256:ef9d7589ef3c200abe66653d3f1ab1033c3c419ae9b9bdb1240a85b024efc88b"},
+    {file = "pyparsing-2.4.7.tar.gz", hash = "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1"},
+]
+pytest = [
+    {file = "pytest-6.2.1-py3-none-any.whl", hash = "sha256:1969f797a1a0dbd8ccf0fecc80262312729afea9c17f1d70ebf85c5e76c6f7c8"},
+    {file = "pytest-6.2.1.tar.gz", hash = "sha256:66e419b1899bc27346cb2c993e12c5e5e8daba9073c1fbce33b9807abc95c306"},
+]
+pytest-cov = [
+    {file = "pytest-cov-2.10.1.tar.gz", hash = "sha256:47bd0ce14056fdd79f93e1713f88fad7bdcc583dcd7783da86ef2f085a0bb88e"},
+    {file = "pytest_cov-2.10.1-py2.py3-none-any.whl", hash = "sha256:45ec2d5182f89a81fc3eb29e3d1ed3113b9e9a873bcddb2a71faaab066110191"},
+]
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+    {file = "pytest-mock-3.4.0.tar.gz", hash = "sha256:c3981f5edee6c4d1942250a60d9b39d38d5585398de1bfce057f925bdda720f4"},
+    {file = "pytest_mock-3.4.0-py3-none-any.whl", hash = "sha256:c0fc979afac4aaba545cbd01e9c20736eb3fefb0a066558764b07d3de8f04ed3"},
+]
+python-json-logger = [
+    {file = "python-json-logger-2.0.1.tar.gz", hash = "sha256:f26eea7898db40609563bed0a7ca11af12e2a79858632706d835a0f961b7d398"},
+]
+pyyaml = [
+    {file = "PyYAML-5.3.1-cp27-cp27m-win32.whl", hash = "sha256:74809a57b329d6cc0fdccee6318f44b9b8649961fa73144a98735b0aaf029f1f"},
+    {file = "PyYAML-5.3.1-cp27-cp27m-win_amd64.whl", hash = "sha256:240097ff019d7c70a4922b6869d8a86407758333f02203e0fc6ff79c5dcede76"},
+    {file = "PyYAML-5.3.1-cp35-cp35m-win32.whl", hash = "sha256:4f4b913ca1a7319b33cfb1369e91e50354d6f07a135f3b901aca02aa95940bd2"},
+    {file = "PyYAML-5.3.1-cp35-cp35m-win_amd64.whl", hash = "sha256:cc8955cfbfc7a115fa81d85284ee61147059a753344bc51098f3ccd69b0d7e0c"},
+    {file = "PyYAML-5.3.1-cp36-cp36m-win32.whl", hash = "sha256:7739fc0fa8205b3ee8808aea45e968bc90082c10aef6ea95e855e10abf4a37b2"},
+    {file = "PyYAML-5.3.1-cp36-cp36m-win_amd64.whl", hash = "sha256:69f00dca373f240f842b2931fb2c7e14ddbacd1397d57157a9b005a6a9942648"},
+    {file = "PyYAML-5.3.1-cp37-cp37m-win32.whl", hash = "sha256:d13155f591e6fcc1ec3b30685d50bf0711574e2c0dfffd7644babf8b5102ca1a"},
+    {file = "PyYAML-5.3.1-cp37-cp37m-win_amd64.whl", hash = "sha256:73f099454b799e05e5ab51423c7bcf361c58d3206fa7b0d555426b1f4d9a3eaf"},
+    {file = "PyYAML-5.3.1-cp38-cp38-win32.whl", hash = "sha256:06a0d7ba600ce0b2d2fe2e78453a470b5a6e000a985dd4a4e54e436cc36b0e97"},
+    {file = "PyYAML-5.3.1-cp38-cp38-win_amd64.whl", hash = "sha256:95f71d2af0ff4227885f7a6605c37fd53d3a106fcab511b8860ecca9fcf400ee"},
+    {file = "PyYAML-5.3.1.tar.gz", hash = "sha256:b8eac752c5e14d3eca0e6dd9199cd627518cb5ec06add0de9d32baeee6fe645d"},
+]
+requests = [
+    {file = "requests-2.25.1-py2.py3-none-any.whl", hash = "sha256:c210084e36a42ae6b9219e00e48287def368a26d03a048ddad7bfee44f75871e"},
+    {file = "requests-2.25.1.tar.gz", hash = "sha256:27973dd4a904a4f13b263a19c866c13b92a39ed1c964655f025f3f8d3d75b804"},
+]
+requests-mock = [
+    {file = "requests-mock-1.8.0.tar.gz", hash = "sha256:e68f46844e4cee9d447150343c9ae875f99fa8037c6dcf5f15bf1fe9ab43d226"},
+    {file = "requests_mock-1.8.0-py2.py3-none-any.whl", hash = "sha256:11215c6f4df72702aa357f205cf1e537cffd7392b3e787b58239bde5fb3db53b"},
+]
+six = [
+    {file = "six-1.15.0-py2.py3-none-any.whl", hash = "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"},
+    {file = "six-1.15.0.tar.gz", hash = "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259"},
+]
+smmap = [
+    {file = "smmap-3.0.4-py2.py3-none-any.whl", hash = "sha256:54c44c197c819d5ef1991799a7e30b662d1e520f2ac75c9efbeb54a742214cf4"},
+    {file = "smmap-3.0.4.tar.gz", hash = "sha256:9c98bbd1f9786d22f14b3d4126894d56befb835ec90cef151af566c7e19b5d24"},
+]
+snowballstemmer = [
+    {file = "snowballstemmer-2.0.0-py2.py3-none-any.whl", hash = "sha256:209f257d7533fdb3cb73bdbd24f436239ca3b2fa67d56f6ff88e86be08cc5ef0"},
+    {file = "snowballstemmer-2.0.0.tar.gz", hash = "sha256:df3bac3df4c2c01363f3dd2cfa78cce2840a79b9f1c2d2de9ce8d31683992f52"},
+]
+stevedore = [
+    {file = "stevedore-3.3.0-py3-none-any.whl", hash = "sha256:50d7b78fbaf0d04cd62411188fa7eedcb03eb7f4c4b37005615ceebe582aa82a"},
+    {file = "stevedore-3.3.0.tar.gz", hash = "sha256:3a5bbd0652bf552748871eaa73a4a8dc2899786bc497a2aa1fcb4dcdb0debeee"},
+]
+testfixtures = [
+    {file = "testfixtures-6.17.0-py2.py3-none-any.whl", hash = "sha256:ebcc3e024d47bb58a60cdc678604151baa0c920ae2814004c89ac9066de31b2c"},
+    {file = "testfixtures-6.17.0.tar.gz", hash = "sha256:fa7c170df68ca6367eda061e9ec339ae3e6d3679c31e04033f83ef97a7d7d0ce"},
+]
+toml = [
+    {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
+    {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
+]
+typing-extensions = [
+    {file = "typing_extensions-3.7.4.3-py2-none-any.whl", hash = "sha256:dafc7639cde7f1b6e1acc0f457842a83e722ccca8eef5270af2d74792619a89f"},
+    {file = "typing_extensions-3.7.4.3-py3-none-any.whl", hash = "sha256:7cb407020f00f7bfc3cb3e7881628838e69d8f3fcab2f64742a5e76b2f841918"},
+    {file = "typing_extensions-3.7.4.3.tar.gz", hash = "sha256:99d4073b617d30288f569d3f13d2bd7548c3a7e4c8de87db09a9d29bb3a4a60c"},
+]
+urllib3 = [
+    {file = "urllib3-1.26.2-py2.py3-none-any.whl", hash = "sha256:d8ff90d979214d7b4f8ce956e80f4028fc6860e4431f731ea4a8c08f23f99473"},
+    {file = "urllib3-1.26.2.tar.gz", hash = "sha256:19188f96923873c92ccb987120ec4acaa12f0461fa9ce5d3d0772bc965a39e08"},
+]
+yapf = [
+    {file = "yapf-0.30.0-py2.py3-none-any.whl", hash = "sha256:3abf61ba67cf603069710d30acbc88cfe565d907e16ad81429ae90ce9651e0c9"},
+    {file = "yapf-0.30.0.tar.gz", hash = "sha256:3000abee4c28daebad55da6c85f3cd07b8062ce48e2e9943c8da1b9667d48427"},
+]
+zipp = [
+    {file = "zipp-3.4.0-py3-none-any.whl", hash = "sha256:102c24ef8f171fd729d46599845e95c7ab894a4cf45f5de11a44cc7444fb1108"},
+    {file = "zipp-3.4.0.tar.gz", hash = "sha256:ed5eee1974372595f9e416cc7bbeeb12335201d8081ca8a0743c954d4446e5cb"},
+]
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..89002be
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,92 @@
+[tool.poetry]
+authors = ["Robert Kaussow <mail@thegeeklab.de>"]
+classifiers = [
+  "Development Status :: 5 - Production/Stable",
+  "Environment :: Console",
+  "License :: OSI Approved :: MIT License",
+  "Intended Audience :: Developers",
+  "Intended Audience :: Information Technology",
+  "Intended Audience :: System Administrators",
+  "Natural Language :: English",
+  "Operating System :: POSIX",
+  "Programming Language :: Python :: 3",
+  "Programming Language :: Python :: 3.6",
+  "Programming Language :: Python :: 3.7",
+  "Programming Language :: Python :: 3.8",
+  "Programming Language :: Python :: 3.9",
+  "Topic :: Utilities",
+  "Topic :: Software Development",
+]
+description = "Clone single branch from all repositories listed in a file."
+documentation = "https://github.com/thegeeklab/git-batch/"
+homepage = "https://github.com/thegeeklab/git-batch/"
+include = [
+  "LICENSE",
+]
+keywords = ["git", "batch", "automation"]
+license = "MIT"
+name = "git-batch"
+packages = [
+  {include = "gitbatch"},
+]
+readme = "README.md"
+repository = "https://github.com/thegeeklab/git-batch/"
+version = "0.0.0"
+
+[tool.poetry.dependencies]
+python = "^3.6.0"
+GitPython = "^3.1.11"
+colorama = "^0.4.4"
+python-json-logger = "^2.0.1"
+
+[tool.poetry.dev-dependencies]
+bandit = "^1.7.0"
+flake8 = "^3.8.4"
+flake8-blind-except = "^0.1.1"
+flake8-builtins = "^1.5.3"
+flake8-colors = "^0.1.9"
+flake8-docstrings = "^1.5.0"
+flake8-eradicate = "^1.0.0"
+flake8-isort = "^4.0.0"
+flake8-logging-format = "^0.6.0"
+flake8-pep3101 = "^1.3.0"
+flake8-polyfill = "^1.0.2"
+flake8-quotes = "^3.2.0"
+pdoc3 = "^0.9.2"
+pep8-naming = "^0.11.1"
+pydocstyle = "^5.1.1"
+pytest = "^6.2.1"
+pytest-cov = "^2.10.1"
+pytest-mock = "^3.4.0"
+requests-mock = "^1.8.0"
+yapf = "^0.30.0"
+
+[tool.poetry.scripts]
+git-batch = "gitbatch.cli:main"
+
+[tool.poetry-dynamic-versioning]
+enable = true
+style = "semver"
+vcs = "git"
+
+[tool.isort]
+default_section = "THIRDPARTY"
+force_single_line = true
+line_length = 99
+sections = ["FUTURE", "STDLIB", "THIRDPARTY", "FIRSTPARTY", "LOCALFOLDER"]
+skip_glob = ["**/.env*", "**/env/*", "**/docs/*"]
+
+[tool.pytest.ini_options]
+addopts = "gitbatch --cov=gitbatch --cov-report=xml:coverage.xml --cov-report=term --cov-append --no-cov-on-fail"
+filterwarnings = [
+  "ignore::FutureWarning",
+  "ignore:.*collections.*:DeprecationWarning",
+  "ignore:.*pep8.*:FutureWarning",
+]
+
+[tool.coverage.run]
+omit = ["**/test/*"]
+
+[build-system]
+build-backend = "poetry.core.masonry.api"
+requires = ["poetry-core>=1.0.0", "poetry-dynamic-versioning"]
diff --git a/setup.cfg b/setup.cfg
index 511d028..0111df1 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,17 +1,20 @@
-[metadata]
-description-file = README.md
-license_file = LICENSE
-
-[bdist_wheel]
-universal = 1
-
-[isort]
-default_section = THIRDPARTY
-known_first_party = gitbatch
-sections = FUTURE,STDLIB,THIRDPARTY,FIRSTPARTY,LOCALFOLDER
-force_single_line = true
-line_length = 99
-skip_glob = **/.env*,**/env/*,**/docs/*
+[flake8]
+# Explanation of errors
+#
+# D102: Missing docstring in public method
+# D103: Missing docstring in public function
+# D107: Missing docstring in __init__
+# D202: No blank lines allowed after function docstring
+# W503:Line break occurred before a binary operator
+ignore = D102, D103, D107, D202, W503
+max-line-length = 99
+inline-quotes = double
+exclude = .git, __pycache__, build, dist, test, *.pyc, *.egg-info, .cache, .eggs, env*
+# NOTE: The format for flake8 output is set in the `.flake8` file. This is separate
+#       because `setup.cfg` is parsed on setup, but it would require flake8-colors
+#       to run successfully (which will only be available after install). So we define
+#       it in `.flake8`, and it seems to successfully combine the settings in the
+#       two files together.
 
 [yapf]
 based_on_style = google
@@ -19,12 +22,3 @@ column_limit = 99
 dedent_closing_brackets = true
 coalesce_brackets = true
 split_before_logical_operator = true
-
-[tool:pytest]
-filterwarnings =
-    ignore::FutureWarning
-    ignore:.*collections.*:DeprecationWarning
-    ignore:.*pep8.*:FutureWarning
-
-[coverage:run]
-omit = **/test/*
diff --git a/setup.py b/setup.py
deleted file mode 100644
index f341cce..0000000
--- a/setup.py
+++ /dev/null
@@ -1,73 +0,0 @@
-#!/usr/bin/env python3
-"""Setup script for the package."""
-
-import io
-import os
-import re
-
-from setuptools import find_packages
-from setuptools import setup
-
-PACKAGE_NAME = "gitbatch"
-
-
-def get_property(prop, project):
-    current_dir = os.path.dirname(os.path.realpath(__file__))
-    result = re.search(
-        r'{}\s*=\s*[\'"]([^\'"]*)[\'"]'.format(prop),
-        open(os.path.join(current_dir, project, "__init__.py")).read())
-    return result.group(1)
-
-
-def get_readme(filename="README.md"):
-    this = os.path.abspath(os.path.dirname(__file__))
-    with io.open(os.path.join(this, filename), encoding="utf-8") as f:
-        long_description = f.read()
-    return long_description
-
-
-setup(
-    name=get_property("__project__", PACKAGE_NAME),
-    version=get_property("__version__", PACKAGE_NAME),
-    description="Clone single branch from all repositories listed in a file.",
-    keywords="git, batch, automation",
-    author=get_property("__author__", PACKAGE_NAME),
-    author_email=get_property("__email__", PACKAGE_NAME),
-    url=get_property("__url__", PACKAGE_NAME),
-    license=get_property("__license__", PACKAGE_NAME),
-    long_description=get_readme(),
-    long_description_content_type="text/markdown",
-    packages=find_packages(exclude=["*.test", "test", "test.*"]),
-    include_package_data=True,
-    zip_safe=False,
-    python_requires=">=3.5,<4",
-    classifiers=[
-        "Development Status :: 5 - Production/Stable",
-        "Environment :: Console",
-        "License :: OSI Approved :: MIT License",
-        "Intended Audience :: Developers",
-        "Intended Audience :: Information Technology",
-        "Intended Audience :: System Administrators",
-        "Natural Language :: English",
-        "Operating System :: POSIX",
-        "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.5",
-        "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: 3.7",
-        "Programming Language :: Python :: 3.8",
-        "Programming Language :: Python :: 3.9",
-        "Topic :: Utilities",
-        "Topic :: Software Development",
-        "Topic :: Software Development :: Documentation",
-    ],
-    install_requires=[
-        "gitpython",
-        "colorama",
-        "python-json-logger",
-    ],
-    entry_points={
-        "console_scripts": [
-            "git-batch = gitbatch.__main__:main"
-        ]
-    },
-)