diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 300b101..9a389fc 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -5,42 +5,41 @@ name: Python package
 
 on:
   push:
-    branches: [ master ]
+    branches: [master]
   pull_request:
-    branches: [ master ]
+    branches: [master]
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10"]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
-      with:
-        python-version: ${{ matrix.python-version }}
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install -e ".[test]"
-    - name: Test with pytest
-      run: |
-        pytest --junitxml=junit_report.xml --cov=believe tests
-    - name: Generate lcov coverage report from .coverage to lcov.info
-      run: |
-        coverage-lcov
-    - name: Export coverage report
-      uses: romeovs/lcov-reporter-action@v0.2.19
-      if: matrix.python-version == '3.9'
-      with:
-        github-token: ${{ secrets.GITHUB_TOKEN }}
-        lcov-file: lcov.info
-    - name: Publish Unit Test Results
-      uses: EnricoMi/publish-unit-test-result-action/composite@v1
-      if: always()
-      with:
-        files: junit_report.xml
+      - uses: actions/checkout@v2
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e ".[test]"
+      - name: Test with pytest
+        run: |
+          pytest --junitxml=junit_report.xml --cov=believe tests
+      - name: Generate lcov coverage report from .coverage to lcov.info
+        run: |
+          coverage-lcov
+      - name: Export coverage report
+        uses: romeovs/lcov-reporter-action@v0.2.19
+        if: matrix.python-version == '3.9'
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          lcov-file: lcov.info
+      - name: Publish Unit Test Results
+        uses: EnricoMi/publish-unit-test-result-action/composite@v1
+        if: always()
+        with:
+          files: junit_report.xml
diff --git a/believe/__init__.py b/believe/__init__.py
index d21ab4f..a545fcc 100644
--- a/believe/__init__.py
+++ b/believe/__init__.py
@@ -1,31 +1,26 @@
-from .error import ValidateError
-
-from .internal import BelieveBase
-from .internal import validate
-
 from .dict_matcher import Dict
 from .dict_matcher import DictOf
 from .dict_matcher import Optional
-
-from .list_matcher import OneOf
+from .error import ValidateError
+from .internal import BelieveBase
+from .internal import validate
 from .list_matcher import AnyOrder
 from .list_matcher import ListOf
-
+from .list_matcher import OneOf
 from .number_matcher import Almost
-from .number_matcher import AnyInt
 from .number_matcher import AnyFloat
-
-from .other_matcher import Nullable
-from .other_matcher import Not
+from .number_matcher import AnyInt
 from .other_matcher import Any
-
-from .str_matcher import AnyStr
+from .other_matcher import Not
+from .other_matcher import Nullable
 from .str_matcher import AnyIntStr
+from .str_matcher import AnyIPV4
 from .str_matcher import AnyJsonStr
+from .str_matcher import AnySHA1
+from .str_matcher import AnyStr
 from .str_matcher import AnyUrl
 from .str_matcher import AnyUUID
-from .str_matcher import AnyIPV4
-from .str_matcher import AnySHA1
+
 
 # Put all Matcher into BelieveMixin
 class BelieveMixin(object):
@@ -39,4 +34,4 @@ class BelieveMixin(object):
     except TypeError:
         pass
 
-__version__ = "1.0.12"
+__version__ = "1.0.13"
diff --git a/believe/dict_matcher.py b/believe/dict_matcher.py
index 21aa021..b8bf841 100644
--- a/believe/dict_matcher.py
+++ b/believe/dict_matcher.py
@@ -1,7 +1,8 @@
 import typing
+
+from .internal import NO_CHECK
 from .internal import BelieveBase
 from .internal import validate
-from .internal import NO_CHECK
 
 
 class Dict(BelieveBase):
diff --git a/believe/error.py b/believe/error.py
index 82832eb..1587aea 100644
--- a/believe/error.py
+++ b/believe/error.py
@@ -1,4 +1,5 @@
-from typing import Any, List
+from typing import Any
+from typing import List
 
 
 class ValidateError(Exception):
diff --git a/believe/internal.py b/believe/internal.py
index f703022..3f372cc 100644
--- a/believe/internal.py
+++ b/believe/internal.py
@@ -1,8 +1,8 @@
 import abc
 import inspect
 from typing import Any
-from .error import ValidateError
 
+from .error import ValidateError
 
 # We use Ellipsis to differentiate if caller assign non-default value for kwargs
 NO_CHECK = USE_DEFAULT = Ellipsis
diff --git a/believe/list_matcher.py b/believe/list_matcher.py
index 84995e3..b3bc743 100644
--- a/believe/list_matcher.py
+++ b/believe/list_matcher.py
@@ -1,8 +1,9 @@
-from typing import Any, List
+from typing import Any
+from typing import List
 
+from .internal import NO_CHECK
 from .internal import BelieveBase
 from .internal import validate
-from .internal import NO_CHECK
 
 
 class OneOf(BelieveBase):
diff --git a/believe/number_matcher.py b/believe/number_matcher.py
index ea07c73..2bb20d9 100644
--- a/believe/number_matcher.py
+++ b/believe/number_matcher.py
@@ -1,6 +1,8 @@
 from typing import Union
 
-from .internal import BelieveBase, NO_CHECK, USE_DEFAULT
+from .internal import NO_CHECK
+from .internal import USE_DEFAULT
+from .internal import BelieveBase
 
 
 class Almost(BelieveBase):
diff --git a/believe/other_matcher.py b/believe/other_matcher.py
index f38e709..725fc4c 100644
--- a/believe/other_matcher.py
+++ b/believe/other_matcher.py
@@ -1,6 +1,7 @@
-from .internal import BelieveBase
 from typing import Any
 
+from .internal import BelieveBase
+
 
 class Nullable(BelieveBase):
     def __init__(self, obj: Any) -> None:
diff --git a/believe/str_matcher.py b/believe/str_matcher.py
index 8d81b67..b9d5dbb 100644
--- a/believe/str_matcher.py
+++ b/believe/str_matcher.py
@@ -1,9 +1,12 @@
-import uuid
 import json
-from typing import Dict, List, Union
+import uuid
+from typing import Dict
+from typing import List
+from typing import Union
 from urllib.parse import urlparse
 
-from .internal import BelieveBase, NO_CHECK
+from .internal import NO_CHECK
+from .internal import BelieveBase
 
 
 class AnyStr(BelieveBase):
diff --git a/pyproject.toml b/pyproject.toml
index 6ebe15d..08b4038 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,12 +11,14 @@ classifiers = [
             "License :: OSI Approved :: MIT License",
             "Operating System :: OS Independent",
             "Programming Language :: Python :: 3",
+            "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",
         ]
 description = "A easy to use validator for json content"
-requires-python = '>=3.8'
+requires-python = '>=3.6'
 dynamic = ["version"]
 keywords = ["json", "validate", "validator"]