diff --git a/.github/maintainers_guide.md b/.github/maintainers_guide.md
index 85b4e13be..4ab491789 100644
--- a/.github/maintainers_guide.md
+++ b/.github/maintainers_guide.md
@@ -25,7 +25,6 @@ $ pyenv local 3.8.5
 
 $ pyenv versions
   system
-  3.6.10
   3.7.7
 * 3.8.5 (set by /path-to-bolt-python/.python-version)
 
diff --git a/README.md b/README.md
index 7576597d5..862c63e96 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ A Python framework to build Slack apps in a flash with the latest platform featu
 ## Setup
 
 ```bash
-# Python 3.6+ required
+# Python 3.7+ required
 python -m venv .venv
 source .venv/bin/activate
 
diff --git a/pyproject.toml b/pyproject.toml
index 5ce2c62bc..5337b5c55 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,7 +8,6 @@ dynamic = ["version", "readme", "dependencies", "authors"]
 description = "The Bolt Framework for Python"
 license = { text = "MIT" }
 classifiers = [
-	"Programming Language :: Python :: 3.6",
 	"Programming Language :: Python :: 3.7",
 	"Programming Language :: Python :: 3.8",
 	"Programming Language :: Python :: 3.9",
@@ -20,7 +19,7 @@ classifiers = [
 	"License :: OSI Approved :: MIT License",
 	"Operating System :: OS Independent",
 ]
-requires-python = ">=3.6"
+requires-python = ">=3.7"
 
 
 [project.urls]
diff --git a/scripts/install_all_and_run_tests.sh b/scripts/install_all_and_run_tests.sh
index 21660dca5..e71c8511b 100755
--- a/scripts/install_all_and_run_tests.sh
+++ b/scripts/install_all_and_run_tests.sh
@@ -16,12 +16,7 @@ pip uninstall python-lambda
 test_target="$1"
 python_version=`python --version | awk '{print $2}'`
 
-if [ ${python_version:0:3} == "3.6" ]
-then
-  pip install -U -r requirements.txt
-else
-  pip install -e .
-fi
+pip install -e .
 
 if [[ $test_target != "" ]]
 then
diff --git a/slack_bolt/async_app.py b/slack_bolt/async_app.py
index 10878c51b..fdf724d4c 100644
--- a/slack_bolt/async_app.py
+++ b/slack_bolt/async_app.py
@@ -5,7 +5,7 @@
 If you'd prefer to build your app with [asyncio](https://docs.python.org/3/library/asyncio.html), you can import the [AIOHTTP](https://docs.aiohttp.org/en/stable/) library and call the `AsyncApp` constructor. Within async apps, you can use the async/await pattern.
 
 ```bash
-# Python 3.6+ required
+# Python 3.7+ required
 python -m venv .venv
 source .venv/bin/activate