diff --git a/README.md b/README.md
index 39747df40..35f623a36 100644
--- a/README.md
+++ b/README.md
@@ -158,8 +158,7 @@ python -m venv .venv
 source .venv/bin/activate
 
 pip install -U pip
-# aiohttp is required
-pip install slack_bolt aiohttp
+pip install "slack_bolt[async]"
 ```
 
 In async apps, all middleware/listeners must be async functions. When calling utility methods (like `ack` and `say`) within these functions, it's required to use the `await` keyword.
diff --git a/docs/english/concepts/async.md b/docs/english/concepts/async.md
index e6ae28fc6..0e8be0930 100644
--- a/docs/english/concepts/async.md
+++ b/docs/english/concepts/async.md
@@ -1,11 +1,11 @@
 # Using async (asyncio)
 
-To use the async version of Bolt, you can import and initialize an `AsyncApp` instance (rather than `App`). `AsyncApp` relies on [AIOHTTP](https://docs.aiohttp.org) to make API requests, which means you'll need to install `aiohttp` (by adding to `requirements.txt` or running `pip install aiohttp`).
+To use the async version of Bolt, you can import and initialize an `AsyncApp` instance (rather than `App`). `AsyncApp` relies on [AIOHTTP](https://docs.aiohttp.org) to make API requests, which means you'll need to install the async extras (by running `pip install "slack-bolt[async]"`).
 
 Sample async projects can be found within the repository's [examples](https://github.com/slackapi/bolt-python/tree/main/examples) folder.
 
 ```python
-# Requirement: install aiohttp
+# Requirement: pip install "slack-bolt[async]"
 from slack_bolt.async_app import AsyncApp
 app = AsyncApp()
 
diff --git a/docs/japanese/concepts/async.md b/docs/japanese/concepts/async.md
index 6687dcff5..135be04ed 100644
--- a/docs/japanese/concepts/async.md
+++ b/docs/japanese/concepts/async.md
@@ -1,11 +1,11 @@
 # Async（asyncio）の使用
 
-非同期バージョンの Bolt を使用する場合は、`App` の代わりに `AsyncApp` インスタンスをインポートして初期化します。`AsyncApp` では [AIOHTTP](https://docs.aiohttp.org/) を使って API リクエストを行うため、`aiohttp` をインストールする必要があります（`requirements.txt` に追記するか、`pip install aiohttp` を実行します）。
+非同期バージョンの Bolt を使用する場合は、`App` の代わりに `AsyncApp` インスタンスをインポートして初期化します。`AsyncApp` では [AIOHTTP](https://docs.aiohttp.org/) を使って API リクエストを行うため、async extras のインストールが必要です（`pip install "slack-bolt[async]"` を実行します）。
 
 非同期バージョンのプロジェクトのサンプルは、リポジトリの [`examples` フォルダ](https://github.com/slackapi/bolt-python/tree/main/examples)にあります。
 
 ```python
-# aiohttp のインストールが必要です
+# pip install "slack-bolt[async]" が必要です
 from slack_bolt.async_app import AsyncApp
 app = AsyncApp()
 
diff --git a/pyproject.toml b/pyproject.toml
index a5c12548b..e116a9629 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "slack_bolt"
-dynamic = ["version", "readme", "authors"]
+dynamic = ["version", "readme", "authors", "optional-dependencies"]
 description = "The Bolt Framework for Python"
 license = { text = "MIT" }
 classifiers = [
@@ -33,6 +33,7 @@ include = ["slack_bolt*"]
 [tool.setuptools.dynamic]
 version = { attr = "slack_bolt.version.__version__" }
 readme = { file = ["README.md"], content-type = "text/markdown" }
+optional-dependencies.async = { file = ["requirements/async.txt"] }
 
 [tool.distutils.bdist_wheel]
 universal = true
diff --git a/slack_bolt/adapter/__init__.py b/slack_bolt/adapter/__init__.py
index f339226bc..9ca556e52 100644
--- a/slack_bolt/adapter/__init__.py
+++ b/slack_bolt/adapter/__init__.py
@@ -1,2 +1 @@
-"""Adapter modules for running Bolt apps along with Web frameworks or Socket Mode.
-"""
+"""Adapter modules for running Bolt apps along with Web frameworks or Socket Mode."""
diff --git a/slack_bolt/async_app.py b/slack_bolt/async_app.py
index fdf724d4c..8fe0c877d 100644
--- a/slack_bolt/async_app.py
+++ b/slack_bolt/async_app.py
@@ -10,8 +10,7 @@
 source .venv/bin/activate
 
 pip install -U pip
-# aiohttp is required
-pip install slack_bolt aiohttp
+pip install "slack_bolt[async]"
 ```
 
 In async apps, all middleware/listeners must be async functions. When calling utility methods (like `ack` and `say`) within these functions, it's required to use the `await` keyword.