diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad4282d5..a7c7198d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -23,6 +23,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Changed
 
 - Updated Python 3.7 syntax to 3.8 ([#956](https://github.com/pdfminer/pdfminer.six/pull/956))
+- Updated all Python version specifications to a minimum of 3.8 ([#969](https://github.com/pdfminer/pdfminer.six/pull/969))
 
 ## [20231228]
 
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index daa600c1..898a26fe 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -30,7 +30,7 @@ Any contribution is appreciated! You might want to:
 * Pull requests should be merged to master.
 * Include unit tests when possible. In case of bugs, this will help to prevent the same mistake in the future. In case
   of features, this will show that your code works correctly.
-* Code should work for Python 3.6+.
+* Code should work for Python 3.8+.
 * Test your code by using nox (see below). 
 * New features should be well documented using docstrings.
 * Check if the [README.md](../README.md) or [readthedocs](../docs/source) documentation needs to be updated. 
diff --git a/docs/source/index.rst b/docs/source/index.rst
index 8650b5d5..5b1a2bf4 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -59,7 +59,7 @@ Features
 Installation instructions
 =========================
 
-* Install Python 3.6 or newer.
+* Install Python 3.8 or newer.
 * Install pdfminer.six.
 
 ::
diff --git a/pdfminer/pdftypes.py b/pdfminer/pdftypes.py
index a2dced55..1fb5be38 100644
--- a/pdfminer/pdftypes.py
+++ b/pdfminer/pdftypes.py
@@ -1,13 +1,13 @@
 import io
 import logging
 import zlib
-from typing import Protocol
 from typing import (
     TYPE_CHECKING,
     Any,
     Dict,
     Iterable,
     Optional,
+    Protocol,
     Union,
     List,
     Tuple,
diff --git a/setup.py b/setup.py
index d50bc033..5926e91d 100644
--- a/setup.py
+++ b/setup.py
@@ -28,8 +28,6 @@
     install_requires=[
         "charset-normalizer >= 2.0.0",
         "cryptography >= 36.0.0",
-        'typing_extensions; python_version < "3.8"',
-        'importlib_metadata; python_version < "3.8"',
     ],
     extras_require=extras_require,
     description="PDF parser and analyzer",
@@ -49,7 +47,7 @@
         "layout analysis",
         "text mining",
     ],
-    python_requires=">=3.6",
+    python_requires=">=3.8",
     classifiers=[
         "Programming Language :: Python",
         "Programming Language :: Python :: 3.8",