diff --git a/.github/maintainers_guide.md b/.github/maintainers_guide.md
index 6d3ab7ff1..97c91372c 100644
--- a/.github/maintainers_guide.md
+++ b/.github/maintainers_guide.md
@@ -71,8 +71,8 @@ If you make changes to `slack_bolt/adapter/*`, please verify if it surely works
 
 ```bash
 # Install all optional dependencies
-$ pip install -e ".[adapter]"
-$ pip install -e ".[adapter_testing]"
+$ pip install -r requirements/adapter.txt
+$ pip install -r requirements/adapter_testing.txt
 
 # Set required env variables
 $ export SLACK_SIGNING_SECRET=***
diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
index 6d1ab0e52..4839962ef 100644
--- a/.github/workflows/codecov.yml
+++ b/.github/workflows/codecov.yml
@@ -26,12 +26,12 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
-          python setup.py install
           pip install -U pip
-          pip install -e ".[async]"
-          pip install -e ".[adapter]"
-          pip install -e ".[testing]"
-          pip install -e ".[adapter_testing]"
+          pip install .
+          pip install -r requirements/async.txt
+          pip install -r requirements/adapter.txt
+          pip install -r requirements/testing.txt
+          pip install -r requirements/adapter_testing.txt
       - name: Run all tests for codecov
         run: |
           pytest --cov=./slack_bolt/ --cov-report=xml
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 11a38d743..fcdc053b8 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -25,17 +25,17 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
-          python setup.py install
           pip install -U pip
-          pip install -e ".[testing_without_asyncio]"
+          pip install -r requirements.txt
+          pip install -r requirements/testing_without_asyncio.txt
       - name: Run tests without aiohttp
         run: |
           pytest tests/slack_bolt/
           pytest tests/scenario_tests/
       - name: Run tests for Socket Mode adapters
         run: |
-          pip install -e ".[adapter]"
-          pip install -e ".[adapter_testing]"
+          pip install -r requirements/adapter.txt
+          pip install -r requirements/adapter_testing.txt
           pytest tests/adapter_tests/socket_mode/
       - name: Run tests for HTTP Mode adapters (AWS)
         run: |
@@ -74,7 +74,7 @@ jobs:
           pytest tests/adapter_tests/tornado/
       - name: Run tests for HTTP Mode adapters (asyncio-based libraries)
         run: |
-          pip install -e ".[async]"
+          pip install -r requirements/async.txt
           # Falcon supports Python 3.11 since its v3.1.1
           pip install "falcon>=3.1.1,<4"
           pytest tests/adapter_tests_async/
diff --git a/pyproject.toml b/pyproject.toml
index 0cda914cd..0292636ef 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,4 +1,53 @@
-# black project prefers pyproject.toml
-# that's why we have this file in addition to other setting files
+[build-system]
+requires = ["setuptools", "pytest-runner==5.2", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "slack_bolt"
+dynamic = ["version", "readme", "dependencies"]
+description = "The Bolt Framework for Python"
+license = { text = "MIT" }
+authors = [{ name = "Slack Technologies, LLC", email = "opensource@slack.com" }]
+classifiers = [
+	"Programming Language :: Python :: 3.6",
+	"Programming Language :: Python :: 3.7",
+	"Programming Language :: Python :: 3.8",
+	"Programming Language :: Python :: 3.9",
+	"Programming Language :: Python :: 3.10",
+	"Programming Language :: Python :: 3.11",
+	"Programming Language :: Python :: 3.12",
+	"Programming Language :: Python :: Implementation :: CPython",
+	"License :: OSI Approved :: MIT License",
+	"Operating System :: OS Independent",
+]
+requires-python = ">=3.6"
+
+
+[project.urls]
+homepage = "https://github.com/slackapi/bolt-python"
+
+[tool.setuptools.packages.find]
+include = ["slack_bolt*"]
+
+[tool.setuptools.dynamic]
+version = { attr = "slack_bolt.version.__version__" }
+readme = { file = ["README.md"], content-type = "text/markdown" }
+dependencies = { file = ["requirements.txt"] }
+
+[tool.distutils.bdist_wheel]
+universal = true
+
 [tool.black]
-line-length = 125
\ No newline at end of file
+line-length = 125
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+log_file = "logs/pytest.log"
+log_file_level = "DEBUG"
+log_format = "%(asctime)s %(levelname)s %(message)s"
+log_date_format = "%Y-%m-%d %H:%M:%S"
+filterwarnings = [
+	"ignore:\"@coroutine\" decorator is deprecated since Python 3.8, use \"async def\" instead:DeprecationWarning",
+	"ignore:The loop argument is deprecated since Python 3.8, and scheduled for removal in Python 3.10.:DeprecationWarning",
+]
+asyncio_mode = "auto"
diff --git a/pytest.ini b/pytest.ini
deleted file mode 100644
index 27f7ad257..000000000
--- a/pytest.ini
+++ /dev/null
@@ -1,9 +0,0 @@
-[pytest]
-log_file = logs/pytest.log
-log_file_level = DEBUG
-log_format = %(asctime)s %(levelname)s %(message)s
-log_date_format = %Y-%m-%d %H:%M:%S
-filterwarnings =
-    ignore:"@coroutine" decorator is deprecated since Python 3.8, use "async def" instead:DeprecationWarning
-    ignore:The loop argument is deprecated since Python 3.8, and scheduled for removal in Python 3.10.:DeprecationWarning
-asyncio_mode = auto
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 000000000..4d4e8fe15
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+slack_sdk>=3.25.0,<4
diff --git a/requirements/adapter.txt b/requirements/adapter.txt
new file mode 100644
index 000000000..81bbd5f12
--- /dev/null
+++ b/requirements/adapter.txt
@@ -0,0 +1,22 @@
+# pip install -r requirements/adapter.txt
+# NOTE: any of async ones requires pip install -r requirements/async.txt too
+# used only under slack_bolt/adapter
+boto3<=2
+bottle>=0.12,<1
+chalice<=1.27.3; python_version=="3.6"
+chalice>=1.28,<2; python_version>"3.6"
+CherryPy>=18,<19
+Django>=3,<5
+falcon>=2,<4; python_version<"3.11"
+falcon>=3.1.1,<4; python_version>="3.11"
+fastapi>=0.70.0,<1
+Flask>=1,<3
+Werkzeug>=2,<3
+pyramid>=1,<3
+sanic>=20,<21; python_version=="3.6"
+sanic>=22,<23; python_version>"3.6"
+starlette>=0.14,<1
+tornado>=6,<7
+uvicorn<1                                # The oldest version can vary among Python runtime versions
+gunicorn>=20,<21
+websocket_client>=1.2.3,<2               # Socket Mode 3rd party implementation
diff --git a/requirements/adapter_testing.txt b/requirements/adapter_testing.txt
new file mode 100644
index 000000000..f2978a463
--- /dev/null
+++ b/requirements/adapter_testing.txt
@@ -0,0 +1,8 @@
+# pip install -r requirements/adapter_testing.txt
+moto>=3,<4                               # For AWS tests
+docker>=5,<6                             # Used by moto
+boddle>=0.2,<0.3                         # For Bottle app tests
+Flask>=1,<2                              # TODO: Flask-Sockets is not yet compatible with Flask 2.x
+Werkzeug>=1,<2                           # TODO: Flask-Sockets is not yet compatible with Flask 2.x
+sanic-testing>=0.7; python_version>"3.6"
+requests>=2,<3                           # For Starlette's TestClient
diff --git a/requirements/async.txt b/requirements/async.txt
new file mode 100644
index 000000000..221ec4ae9
--- /dev/null
+++ b/requirements/async.txt
@@ -0,0 +1,4 @@
+# pip install -r requirements/async.txt
+aiohttp>=3,<4
+websockets>=8,<10; python_version=="3.6"
+websockets>=10,<11; python_version>"3.6"
diff --git a/requirements/testing.txt b/requirements/testing.txt
new file mode 100644
index 000000000..6fbcc045d
--- /dev/null
+++ b/requirements/testing.txt
@@ -0,0 +1,6 @@
+# pip install -r requirements/testing.txt
+-r testing_without_asyncio.txt
+
+pytest-asyncio>=0.16.0; python_version=="3.6"
+pytest-asyncio>=0.18.2,<1; python_version>"3.6"
+aiohttp>=3,<4
diff --git a/requirements/testing_without_asyncio.txt b/requirements/testing_without_asyncio.txt
new file mode 100644
index 000000000..0f971986c
--- /dev/null
+++ b/requirements/testing_without_asyncio.txt
@@ -0,0 +1,9 @@
+# pip install -r requirements/testing_without_asyncio.txt
+pytest>=6.2.5,<7
+pytest-cov>=3,<4
+Flask-Sockets>=0.2,<1     # TODO: This module is not yet Flask 2.x compatible
+Werkzeug>=1,<2            # TODO: Flask-Sockets is not yet compatible with Flask 2.x
+itsdangerous==2.0.1       # TODO: Flask-Sockets is not yet compatible with Flask 2.x
+Jinja2==3.0.3             # https://github.com/pallets/flask/issues/4494
+black==22.8.0             # Until we drop Python 3.6 support, we have to stay with this version
+click<=8.0.4              # black is affected by https://github.com/pallets/click/issues/2225
diff --git a/scripts/build_pypi_package.sh b/scripts/build_pypi_package.sh
index 4fbf1b704..79c6db9f2 100755
--- a/scripts/build_pypi_package.sh
+++ b/scripts/build_pypi_package.sh
@@ -5,7 +5,7 @@ cd ${script_dir}/..
 rm -rf ./slack_bolt.egg-info
 
 pip install -U pip && \
-  pip install twine wheel && \
+  pip install twine build && \
   rm -rf dist/ build/ slack_bolt.egg-info/ && \
-  python setup.py sdist bdist_wheel && \
-  twine check dist/*
\ No newline at end of file
+  python -m build --sdist --wheel && \
+  twine check dist/*
diff --git a/scripts/deploy_to_pypi_org.sh b/scripts/deploy_to_pypi_org.sh
index 5ac4c9907..a3cf431fa 100755
--- a/scripts/deploy_to_pypi_org.sh
+++ b/scripts/deploy_to_pypi_org.sh
@@ -5,8 +5,8 @@ cd ${script_dir}/..
 rm -rf ./slack_bolt.egg-info
 
 pip install -U pip && \
-  pip install twine wheel && \
+  pip install twine build && \
   rm -rf dist/ build/ slack_bolt.egg-info/ && \
-  python setup.py sdist bdist_wheel && \
+  python -m build --sdist --wheel && \
   twine check dist/* && \
   twine upload dist/*
diff --git a/scripts/deploy_to_test_pypi_org.sh b/scripts/deploy_to_test_pypi_org.sh
index d6a105f77..b2cc65a12 100644
--- a/scripts/deploy_to_test_pypi_org.sh
+++ b/scripts/deploy_to_test_pypi_org.sh
@@ -5,8 +5,8 @@ cd ${script_dir}/..
 rm -rf ./slack_bolt.egg-info
 
 pip install -U pip && \
-  pip install twine wheel && \
+  pip install twine build && \
   rm -rf dist/ build/ slack_bolt.egg-info/ && \
-  python setup.py sdist bdist_wheel && \
+  python -m build --sdist --wheel && \
   twine check dist/* && \
   twine upload --repository testpypi dist/*
\ No newline at end of file
diff --git a/scripts/install_all_and_run_tests.sh b/scripts/install_all_and_run_tests.sh
index cda15a058..c5da9647e 100755
--- a/scripts/install_all_and_run_tests.sh
+++ b/scripts/install_all_and_run_tests.sh
@@ -10,26 +10,28 @@ rm -rf ./slack_bolt.egg-info
 pip uninstall python-lambda
 
 test_target="$1"
+python_version=`python --version | awk '{print $2}'`
 
-pip install -e .
+if [ ${python_version:0:3} == "3.6" ]
+then
+  pip install -r requirements.txt
+else
+  pip install -e .
+fi
 
 if [[ $test_target != "" ]]
 then
-  # To fix: Using legacy 'setup.py install' for greenlet, since package 'wheel' is not installed.
-  pip install -U wheel && \
-    pip install -e ".[testing]" && \
-    pip install -e ".[adapter]" && \
-    pip install -e ".[adapter_testing]" && \
+    pip install -r requirements/testing.txt && \
+    pip install -r requirements/adapter.txt && \
+    pip install -r requirements/adapter_testing.txt && \
     # To avoid errors due to the old versions of click forced by Chalice
     pip install -U pip click && \
     black slack_bolt/ tests/ && \
     pytest $1
 else
-  # To fix: Using legacy 'setup.py install' for greenlet, since package 'wheel' is not installed.
-  pip install -U wheel && \
-    pip install -e ".[testing]" && \
-    pip install -e ".[adapter]" && \
-    pip install -e ".[adapter_testing]" && \
+    pip install -r requirements/testing.txt && \
+    pip install -r requirements/adapter.txt && \
+    pip install -r requirements/adapter_testing.txt && \
     # To avoid errors due to the old versions of click forced by Chalice
     pip install -U pip click && \
     black slack_bolt/ tests/ && \
diff --git a/scripts/run_pytype.sh b/scripts/run_pytype.sh
index 3f6a91e31..4c06a8905 100755
--- a/scripts/run_pytype.sh
+++ b/scripts/run_pytype.sh
@@ -3,7 +3,8 @@
 
 script_dir=$(dirname $0)
 cd ${script_dir}/.. && \
-  pip install -e ".[async]" && \
-  pip install -e ".[adapter]" && \
+  pip install .
+  pip install -r requirements/async.txt && \
+  pip install -r requirements/adapter.txt && \
   pip install "pytype==2022.12.15" && \
   pytype slack_bolt/
diff --git a/scripts/run_tests.sh b/scripts/run_tests.sh
index c380e7684..2507a8e3b 100755
--- a/scripts/run_tests.sh
+++ b/scripts/run_tests.sh
@@ -19,8 +19,8 @@ else
     # pytype's behavior can be different in older Python versions
     black slack_bolt/ tests/ \
       && pytest -vv \
-      && pip install -e ".[adapter]" \
-      && pip install -e ".[adapter_testing]" \
+      && pip install -r requirements/adapter.txt \
+      && pip install -r requirements/adapter_testing.txt \
       && pip install -U pip setuptools wheel \
       && pip install -U pytype \
       && pytype slack_bolt/
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index 5841ac1a4..000000000
--- a/setup.cfg
+++ /dev/null
@@ -1,5 +0,0 @@
-[bdist_wheel]
-universal = 1
-
-[aliases]
-test=pytest
diff --git a/setup.py b/setup.py
deleted file mode 100755
index 474bd8da0..000000000
--- a/setup.py
+++ /dev/null
@@ -1,118 +0,0 @@
-#!/usr/bin/env python
-import os
-import sys
-
-import setuptools
-
-here = os.path.abspath(os.path.dirname(__file__))
-
-__version__ = None
-exec(open(f"{here}/slack_bolt/version.py").read())
-
-with open(f"{here}/README.md", "r") as fh:
-    long_description = fh.read()
-
-test_dependencies = [
-    "pytest>=6.2.5,<7",
-    "pytest-cov>=3,<4",
-    "Flask-Sockets>=0.2,<1",  # TODO: This module is not yet Flask 2.x compatible
-    "Werkzeug>=1,<2",  # TODO: Flask-Sockets is not yet compatible with Flask 2.x
-    "itsdangerous==2.0.1",  # TODO: Flask-Sockets is not yet compatible with Flask 2.x
-    "Jinja2==3.0.3",  # https://github.com/pallets/flask/issues/4494
-    "black==22.8.0",  # Until we drop Python 3.6 support, we have to stay with this version
-    "click<=8.0.4",  # black is affected by https://github.com/pallets/click/issues/2225
-]
-
-adapter_test_dependencies = [
-    "moto>=3,<4",  # For AWS tests
-    "docker>=5,<6",  # Used by moto
-    "boddle>=0.2,<0.3",  # For Bottle app tests
-    "Flask>=1,<2",  # TODO: Flask-Sockets is not yet compatible with Flask 2.x
-    "Werkzeug>=1,<2",  # TODO: Flask-Sockets is not yet compatible with Flask 2.x
-    "sanic-testing>=0.7" if sys.version_info.minor > 6 else "",
-    "requests>=2,<3",  # For Starlette's TestClient
-]
-
-async_test_dependencies = test_dependencies + [
-    "pytest-asyncio>=0.18.2,<1",  # for async
-    "aiohttp>=3,<4",  # for async
-]
-
-setuptools.setup(
-    name="slack_bolt",
-    version=__version__,
-    license="MIT",
-    author="Slack Technologies, LLC",
-    author_email="opensource@slack.com",
-    description="The Bolt Framework for Python",
-    long_description=long_description,
-    long_description_content_type="text/markdown",
-    url="https://github.com/slackapi/bolt-python",
-    packages=setuptools.find_packages(
-        exclude=[
-            "examples",
-            "integration_tests",
-            "tests",
-            "tests.*",
-        ]
-    ),
-    include_package_data=True,  # MANIFEST.in
-    install_requires=[
-        "slack_sdk>=3.25.0,<4",
-    ],
-    setup_requires=["pytest-runner==5.2"],
-    tests_require=async_test_dependencies,
-    test_suite="tests",
-    extras_require={
-        # pip install -e ".[async]"
-        "async": [
-            # async features heavily depends on aiohttp
-            "aiohttp>=3,<4",
-            # Socket Mode 3rd party implementation
-            "websockets>=10,<11" if sys.version_info.minor > 6 else "websockets>=8,<10",
-        ],
-        # pip install -e ".[adapter]"
-        # NOTE: any of async ones requires pip install -e ".[async]" too
-        "adapter": [
-            # used only under src/slack_bolt/adapter
-            "boto3<=2",
-            "bottle>=0.12,<1",
-            "chalice>=1.28,<2" if sys.version_info.minor > 6 else "chalice<=1.27.3",
-            "CherryPy>=18,<19",
-            "Django>=3,<5",
-            "falcon>=3.1.1,<4" if sys.version_info.minor >= 11 else "falcon>=2,<4",
-            "fastapi>=0.70.0,<1",
-            "Flask>=1,<3",
-            "Werkzeug>=2,<3",
-            "pyramid>=1,<3",
-            "sanic>=22,<23" if sys.version_info.minor > 6 else "sanic>=20,<21",
-            "starlette>=0.14,<1",
-            "tornado>=6,<7",
-            # server
-            "uvicorn<1",  # The oldest version can vary among Python runtime versions
-            "gunicorn>=20,<21",
-            # Socket Mode 3rd party implementation
-            # Note: 1.2.2 has a regression (https://github.com/websocket-client/websocket-client/issues/769)
-            "websocket_client>=1.2.3,<2",
-        ],
-        # pip install -e ".[testing_without_asyncio]"
-        "testing_without_asyncio": test_dependencies,
-        # pip install -e ".[testing]"
-        "testing": async_test_dependencies,
-        # pip install -e ".[adapter_testing]"
-        "adapter_testing": adapter_test_dependencies,
-    },
-    classifiers=[
-        "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: 3.7",
-        "Programming Language :: Python :: 3.8",
-        "Programming Language :: Python :: 3.9",
-        "Programming Language :: Python :: 3.10",
-        "Programming Language :: Python :: 3.11",
-        "Programming Language :: Python :: 3.12",
-        "Programming Language :: Python :: Implementation :: CPython",
-        "License :: OSI Approved :: MIT License",
-        "Operating System :: OS Independent",
-    ],
-    python_requires=">=3.6",
-)