diff --git a/.github/workflows/unittest.yml b/.github/workflows/unittest.yml
index 6f33075..1e8412e 100644
--- a/.github/workflows/unittest.yml
+++ b/.github/workflows/unittest.yml
@@ -20,8 +20,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
-        python -m pip install --upgrade pip setuptools wheel
-        python -m pip install jieba six
+        python -m pip install jieba
     - name: run unittest
       run: |
         python -m unittest discover tests
diff --git a/pinyin/__init__.py b/pinyin/__init__.py
index 3b9331a..8925423 100644
--- a/pinyin/__init__.py
+++ b/pinyin/__init__.py
@@ -1,6 +1,5 @@
 # -*- coding: utf-8 -*-
 
-from __future__ import unicode_literals
 from io import open
 
 import jieba
@@ -10,12 +9,11 @@
 
 from pinyin.config import FILE_WORDS, FILE_WORD, FILE_TERM, FILE_USER_DICT, CHINESE_RE
 from pinyin.utils import Singleton
-from six import with_metaclass
 
 __all__ = ["Pinyin"]
 
 
-class Pinyin(with_metaclass(Singleton, object)):
+class Pinyin(metaclass=Singleton):
 
     def __init__(self):
 
diff --git a/pinyin/config.py b/pinyin/config.py
index 6f798b1..3a96b01 100644
--- a/pinyin/config.py
+++ b/pinyin/config.py
@@ -1,6 +1,5 @@
 # -*- coding: utf-8 -*-
 
-from __future__ import unicode_literals
 import re
 from os.path import join, abspath, dirname
 
diff --git a/pinyin/utils.py b/pinyin/utils.py
index 7371001..281fba7 100644
--- a/pinyin/utils.py
+++ b/pinyin/utils.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-from __future__ import unicode_literals
 class Singleton(type):
 
     _instances = {}
diff --git a/pyproject.toml b/pyproject.toml
index 5b25692..b7d8191 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,6 @@ classifiers = [
 
 dependencies = [
     "jieba",
-    "six",
 ]
 
 readme = "README.md"
@@ -30,4 +29,7 @@ Homepage = "https://github.com/xospc/python-smart-pinyin"
 requires = ["setuptools>=64", "setuptools-scm>=8"]
 build-backend = "setuptools.build_meta"
 
+[tool.requires-python]
+version = ">=3.10"
+
 [tool.setuptools_scm]
diff --git a/tests/test_pinyin.py b/tests/test_pinyin.py
index d9e5b69..385f443 100644
--- a/tests/test_pinyin.py
+++ b/tests/test_pinyin.py
@@ -1,6 +1,5 @@
 # -*- coding: utf-8 -*-
 
-from __future__ import unicode_literals
 import unittest
 
 from pinyin import Pinyin