diff --git a/.github/workflows/python-publish.yml b/.github/workflows/python-publish.yml
index d5306f35..fd8bcba4 100644
--- a/.github/workflows/python-publish.yml
+++ b/.github/workflows/python-publish.yml
@@ -12,21 +12,18 @@ on:
 jobs:
   publish:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version: [2.7, 3.6]
     steps:
       - uses: actions/checkout@v2
 
-      - name: Set up Python ${{ matrix.python-version }}
+      - name: Set up Python
         uses: actions/setup-python@v2
         with:
-          python-version: ${{ matrix.python-version }}
+          python-version: '3.x'
 
       - name: Bootstrap poetry
         run: |
-          python -m pip install --upgrade pip
-          pip install "poetry<1.2"
+          curl -sL https://raw.githubusercontent.com/python-poetry/poetry/master/install-poetry.py | python - -y
+          echo "$HOME/.local/bin" >> $GITHUB_PATH
 
       - name: Build
         run: poetry build
diff --git a/.github/workflows/python-test.yml b/.github/workflows/python-test.yml
index f447f4ac..d511ca94 100644
--- a/.github/workflows/python-test.yml
+++ b/.github/workflows/python-test.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: [2.7, 3.5, 3.6, 3.7, 3.8, 3.9]
+        python-version: ['3.7', '3.8', '3.9', '3.10']
         os: [windows-latest, ubuntu-latest]
       fail-fast: false
     steps:
diff --git a/.travis.yml b/.travis.yml
index 26d675d2..ba691cf7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,16 +2,14 @@ language: python
 sudo: false
 matrix:
   include:
-  - python: 2.7
-  - python: 3.5
-  - python: 3.6
-  - python: 3.7
-  - python: 3.8
-  - python: 3.9
-  - python: nightly
-  - python: pypy3
+  - python: '3.7'
+  - python: '3.8'
+  - python: '3.9'
+  - python: '3.10-dev'
+  - python: 'nightly'
+  - python: 'pypy3'
   allow_failures:
-  - python: nightly
+  - python: 'nightly'
 before_install:
 - python -m pip install --upgrade pip
 - pip install "poetry<1.2"
diff --git a/openapi_spec_validator/generators.py b/openapi_spec_validator/generators.py
index 74c31435..a7b9ee6b 100644
--- a/openapi_spec_validator/generators.py
+++ b/openapi_spec_validator/generators.py
@@ -1,7 +1,6 @@
 """OpenAPI spec validator generators module."""
 import logging
 
-from six import iteritems
 from jsonschema.validators import Draft4Validator
 
 from openapi_spec_validator.decorators import DerefValidatorDecorator
@@ -37,6 +36,6 @@ def from_spec_resolver(cls, spec_resolver):
         :type instance_resolver: :class:`jsonschema.RefResolver`
         """
         deref = DerefValidatorDecorator(spec_resolver)
-        for key, validator_callable in iteritems(Draft4Validator.VALIDATORS):
+        for key, validator_callable in Draft4Validator.VALIDATORS.items():
             if key in cls.validators:
                 yield key, deref(validator_callable)
diff --git a/openapi_spec_validator/handlers/file.py b/openapi_spec_validator/handlers/file.py
index 79a4b1f1..abba9cef 100644
--- a/openapi_spec_validator/handlers/file.py
+++ b/openapi_spec_validator/handlers/file.py
@@ -1,5 +1,5 @@
 """OpenAPI spec validator handlers file module."""
-from six import StringIO
+import io
 from yaml import load
 
 from openapi_spec_validator.handlers.base import BaseHandler
@@ -21,7 +21,7 @@ class FileHandler(FileObjectHandler):
     """OpenAPI spec validator file path handler."""
 
     def __call__(self, uri):
-        if isinstance(uri, StringIO):
+        if isinstance(uri, io.StringIO):
             return super(FileHandler, self).__call__(uri)
 
         assert uri.startswith("file")
diff --git a/openapi_spec_validator/handlers/requests.py b/openapi_spec_validator/handlers/requests.py
index e998dfe1..05165f38 100644
--- a/openapi_spec_validator/handlers/requests.py
+++ b/openapi_spec_validator/handlers/requests.py
@@ -1,10 +1,9 @@
 """OpenAPI spec validator handlers requests module."""
-from __future__ import absolute_import
 import contextlib
-
-from six import StringIO
-from six.moves.urllib.parse import urlparse
+import io
 import requests
+import urllib.parse
+
 
 from openapi_spec_validator.handlers.file import FileHandler
 
@@ -18,7 +17,7 @@ def __init__(self, *allowed_schemes, **options):
         self.allowed_schemes = allowed_schemes
 
     def __call__(self, url):
-        scheme = urlparse(url).scheme
+        scheme = urllib.parse.urlparse(url).scheme
         assert scheme in self.allowed_schemes
 
         if scheme == "file":
@@ -27,6 +26,6 @@ def __call__(self, url):
         response = requests.get(url, timeout=self.timeout)
         response.raise_for_status()
 
-        data = StringIO(response.text)
+        data = io.StringIO(response.text)
         with contextlib.closing(data) as fh:
             return super(UrlRequestsHandler, self).__call__(fh)
diff --git a/openapi_spec_validator/handlers/urllib.py b/openapi_spec_validator/handlers/urllib.py
index 39544a24..44c2419d 100644
--- a/openapi_spec_validator/handlers/urllib.py
+++ b/openapi_spec_validator/handlers/urllib.py
@@ -1,8 +1,8 @@
 """OpenAPI spec validator handlers requests module."""
 import contextlib
 
-from six.moves.urllib.parse import urlparse
-from six.moves.urllib.request import urlopen
+import urllib.parse
+import urllib.request
 
 from openapi_spec_validator.handlers.file import FileObjectHandler
 
@@ -16,9 +16,9 @@ def __init__(self, *allowed_schemes, **options):
         self.allowed_schemes = allowed_schemes
 
     def __call__(self, url):
-        assert urlparse(url).scheme in self.allowed_schemes
+        assert urllib.parse.urlparse(url).scheme in self.allowed_schemes
 
-        f = urlopen(url, timeout=self.timeout)
+        f = urllib.request.urlopen(url, timeout=self.timeout)
 
         with contextlib.closing(f) as fh:
             return super(UrllibHandler, self).__call__(fh)
diff --git a/openapi_spec_validator/handlers/utils.py b/openapi_spec_validator/handlers/utils.py
index 8b688302..2dd5a85b 100644
--- a/openapi_spec_validator/handlers/utils.py
+++ b/openapi_spec_validator/handlers/utils.py
@@ -1,12 +1,12 @@
 import os.path
 
-from six.moves.urllib.parse import urlparse, unquote
-from six.moves.urllib.request import url2pathname
+import urllib.parse
+import urllib.request
 
 
 def uri_to_path(uri):
-    parsed = urlparse(uri)
+    parsed = urllib.parse.urlparse(uri)
     host = "{0}{0}{mnt}{0}".format(os.path.sep, mnt=parsed.netloc)
     return os.path.normpath(
-        os.path.join(host, url2pathname(unquote(parsed.path)))
+        os.path.join(host, urllib.request.url2pathname(urllib.parse.unquote(parsed.path)))
     )
diff --git a/openapi_spec_validator/readers.py b/openapi_spec_validator/readers.py
index 5fb5f802..7c4fe6c2 100644
--- a/openapi_spec_validator/readers.py
+++ b/openapi_spec_validator/readers.py
@@ -1,8 +1,5 @@
 import os
-try:
-    import pathlib
-except ImportError:
-    import pathlib2 as pathlib
+import pathlib
 import sys
 
 from openapi_spec_validator import all_urls_handler, file_object_handler
diff --git a/openapi_spec_validator/schemas.py b/openapi_spec_validator/schemas.py
index c2857c00..22b9d0f8 100644
--- a/openapi_spec_validator/schemas.py
+++ b/openapi_spec_validator/schemas.py
@@ -2,7 +2,8 @@
 import os
 
 from pkg_resources import resource_filename
-from six.moves.urllib import parse, request
+import urllib.parse
+import urllib.request
 from yaml import load
 
 from openapi_spec_validator.loaders import ExtendedSafeLoader
@@ -13,7 +14,7 @@ def get_openapi_schema(version):
     path_resource = resource_filename('openapi_spec_validator', path)
     path_full = os.path.join(os.path.dirname(__file__), path_resource)
     schema = read_yaml_file(path_full)
-    schema_url = parse.urljoin('file:', request.pathname2url(path_full))
+    schema_url = urllib.parse.urljoin('file:', urllib.request.pathname2url(path_full))
     return schema, schema_url
 
 
diff --git a/openapi_spec_validator/shortcuts.py b/openapi_spec_validator/shortcuts.py
index 83fff18a..ef5ee292 100644
--- a/openapi_spec_validator/shortcuts.py
+++ b/openapi_spec_validator/shortcuts.py
@@ -1,5 +1,5 @@
 """OpenAPI spec validator shortcuts module."""
-from six.moves.urllib import parse
+import urllib.parse
 
 
 def validate_spec_factory(validator_callable):
@@ -10,7 +10,7 @@ def validate(spec, spec_url=''):
 
 def validate_spec_url_factory(validator_callable, handlers):
     def validate(url):
-        result = parse.urlparse(url)
+        result = urllib.parse.urlparse(url)
         handler = handlers[result.scheme]
         spec = handler(url)
         return validator_callable(spec, spec_url=url)
diff --git a/openapi_spec_validator/validators.py b/openapi_spec_validator/validators.py
index ee269619..b4199ad4 100644
--- a/openapi_spec_validator/validators.py
+++ b/openapi_spec_validator/validators.py
@@ -3,7 +3,6 @@
 
 from jsonschema.validators import RefResolver
 from openapi_schema_validator import OAS30Validator, oas30_format_checker
-from six import iteritems
 
 from openapi_spec_validator.exceptions import (
     ParameterDuplicateError, ExtraParametersError, UnresolvableParameterError,
@@ -108,7 +107,7 @@ def __init__(self, dereferencer):
     @wraps_errors
     def iter_errors(self, schemas):
         schemas_deref = self.dereferencer.dereference(schemas)
-        for name, schema in iteritems(schemas_deref):
+        for name, schema in schemas_deref.items():
             for err in self._iter_schema_errors(schema):
                 yield err
 
@@ -164,7 +163,7 @@ def __init__(self, dereferencer, operation_ids_registry=None):
     @wraps_errors
     def iter_errors(self, paths):
         paths_deref = self.dereferencer.dereference(paths)
-        for url, path_item in iteritems(paths_deref):
+        for url, path_item in paths_deref.items():
             for err in self._iter_path_errors(url, path_item):
                 yield err
 
@@ -213,7 +212,7 @@ def iter_errors(self, url, path_item):
         for err in self._iter_parameters_errors(parameters):
             yield err
 
-        for field_name, operation in iteritems(path_item):
+        for field_name, operation in path_item.items():
             if field_name not in self.OPERATIONS:
                 continue
 
diff --git a/poetry.lock b/poetry.lock
index b8d931ff..8a21425c 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,14 +1,11 @@
 [[package]]
-name = "aspy.yaml"
-version = "1.3.0"
-description = "A few extensions to pyyaml."
+name = "atomicwrites"
+version = "1.4.0"
+description = "Atomic file writes."
 category = "dev"
-optional = true
+optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
-[package.dependencies]
-pyyaml = "*"
-
 [[package]]
 name = "attrs"
 version = "21.4.0"
@@ -33,22 +30,22 @@ python-versions = "*"
 
 [[package]]
 name = "cfgv"
-version = "2.0.1"
+version = "3.3.1"
 description = "Validate configuration and produce human readable error messages."
 category = "dev"
 optional = true
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[package.dependencies]
-six = "*"
+python-versions = ">=3.6.1"
 
 [[package]]
-name = "chardet"
-version = "4.0.0"
-description = "Universal encoding detector for Python 2 and 3"
+name = "charset-normalizer"
+version = "2.0.10"
+description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
 category = "main"
 optional = true
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=3.5.0"
+
+[package.extras]
+unicode_backport = ["unicodedata2"]
 
 [[package]]
 name = "colorama"
@@ -58,33 +55,19 @@ category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
-[[package]]
-name = "configparser"
-version = "4.0.2"
-description = "Updated configparser from Python 3.7 for Python 2.6+."
-category = "main"
-optional = false
-python-versions = ">=2.6"
-
-[package.extras]
-docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2)", "pytest-flake8", "pytest-black-multipy"]
-
-[[package]]
-name = "contextlib2"
-version = "0.6.0.post1"
-description = "Backports and enhancements for the contextlib module"
-category = "main"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
 [[package]]
 name = "coverage"
-version = "4.4.2"
+version = "6.3"
 description = "Code coverage measurement for Python"
 category = "dev"
 optional = false
-python-versions = "*"
+python-versions = ">=3.7"
+
+[package.dependencies]
+tomli = {version = "*", optional = true, markers = "extra == \"toml\""}
+
+[package.extras]
+toml = ["tomli"]
 
 [[package]]
 name = "distlib"
@@ -94,152 +77,108 @@ category = "dev"
 optional = false
 python-versions = "*"
 
-[[package]]
-name = "enum34"
-version = "1.1.10"
-description = "Python 3.4 Enum backported to 3.3, 3.2, 3.1, 2.7, 2.6, 2.5, and 2.4"
-category = "dev"
-optional = false
-python-versions = "*"
-
 [[package]]
 name = "filelock"
-version = "3.2.1"
+version = "3.4.2"
 description = "A platform independent file lock."
 category = "dev"
 optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
+python-versions = ">=3.7"
 
 [package.extras]
 docs = ["furo (>=2021.8.17b43)", "sphinx (>=4.1)", "sphinx-autodoc-typehints (>=1.12)"]
-testing = ["coverage (>=4)", "pytest (>=4)", "pytest-cov", "pytest-timeout (>=1.4.2)"]
+testing = ["covdefaults (>=1.2.0)", "coverage (>=4)", "pytest (>=4)", "pytest-cov", "pytest-timeout (>=1.4.2)"]
 
 [[package]]
 name = "flake8"
-version = "3.9.2"
+version = "4.0.1"
 description = "the modular source code checker: pep8 pyflakes and co"
 category = "dev"
 optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
+python-versions = ">=3.6"
 
 [package.dependencies]
-configparser = {version = "*", markers = "python_version < \"3.2\""}
-enum34 = {version = "*", markers = "python_version < \"3.4\""}
-functools32 = {version = "*", markers = "python_version < \"3.2\""}
-importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
+importlib-metadata = {version = "<4.3", markers = "python_version < \"3.8\""}
 mccabe = ">=0.6.0,<0.7.0"
-pycodestyle = ">=2.7.0,<2.8.0"
-pyflakes = ">=2.3.0,<2.4.0"
-typing = {version = "*", markers = "python_version < \"3.5\""}
-
-[[package]]
-name = "funcsigs"
-version = "1.0.2"
-description = "Python function signatures from PEP362 for Python 2.6, 2.7 and 3.2+"
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "functools32"
-version = "3.2.3-2"
-description = "Backport of the functools module from Python 3.2.3 for use on 2.7 and PyPy."
-category = "main"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "futures"
-version = "3.3.0"
-description = "Backport of the concurrent.futures package from Python 3"
-category = "dev"
-optional = true
-python-versions = ">=2.6, <3"
+pycodestyle = ">=2.8.0,<2.9.0"
+pyflakes = ">=2.4.0,<2.5.0"
 
 [[package]]
 name = "identify"
-version = "1.6.2"
+version = "2.4.5"
 description = "File identification library for Python"
 category = "dev"
 optional = true
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+python-versions = ">=3.7"
 
 [package.extras]
-license = ["editdistance"]
+license = ["ukkonen"]
 
 [[package]]
 name = "idna"
-version = "2.10"
+version = "3.3"
 description = "Internationalized Domain Names in Applications (IDNA)"
 category = "main"
 optional = true
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=3.5"
 
 [[package]]
 name = "importlib-metadata"
-version = "2.1.3"
+version = "4.2.0"
 description = "Read metadata from Python packages"
 category = "main"
 optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
+python-versions = ">=3.6"
 
 [package.dependencies]
-configparser = {version = ">=3.5", markers = "python_version < \"3\""}
-contextlib2 = {version = "*", markers = "python_version < \"3\""}
-pathlib2 = {version = "*", markers = "python_version < \"3\""}
+typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
 zipp = ">=0.5"
 
 [package.extras]
-docs = ["sphinx", "rst.linker"]
-testing = ["packaging", "pep517", "unittest2", "importlib-resources (>=1.3)"]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
 
 [[package]]
 name = "importlib-resources"
-version = "3.2.1"
+version = "5.4.0"
 description = "Read resources from Python packages"
-category = "dev"
+category = "main"
 optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
+python-versions = ">=3.6"
 
 [package.dependencies]
-contextlib2 = {version = "*", markers = "python_version < \"3\""}
-pathlib2 = {version = "*", markers = "python_version < \"3\""}
-singledispatch = {version = "*", markers = "python_version < \"3.4\""}
-typing = {version = "*", markers = "python_version < \"3.5\""}
-zipp = {version = ">=0.4", markers = "python_version < \"3.8\""}
+zipp = {version = ">=3.1.0", markers = "python_version < \"3.10\""}
 
 [package.extras]
-docs = ["sphinx", "rst.linker", "jaraco.packaging"]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-black (>=0.3.7)", "pytest-mypy"]
 
 [[package]]
-name = "isodate"
-version = "0.6.1"
-description = "An ISO 8601 date/time/duration parser and formatter"
-category = "main"
+name = "iniconfig"
+version = "1.1.1"
+description = "iniconfig: brain-dead simple config-ini parsing"
+category = "dev"
 optional = false
 python-versions = "*"
 
-[package.dependencies]
-six = "*"
-
 [[package]]
 name = "jsonschema"
-version = "3.2.0"
+version = "4.4.0"
 description = "An implementation of JSON Schema validation for Python"
 category = "main"
 optional = false
-python-versions = "*"
+python-versions = ">=3.7"
 
 [package.dependencies]
 attrs = ">=17.4.0"
-functools32 = {version = "*", markers = "python_version < \"3\""}
 importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
-pyrsistent = ">=0.14.0"
-six = ">=1.11.0"
+importlib-resources = {version = ">=1.4.0", markers = "python_version < \"3.9\""}
+pyrsistent = ">=0.14.0,<0.17.0 || >0.17.0,<0.17.1 || >0.17.1,<0.17.2 || >0.17.2"
+typing-extensions = {version = "*", markers = "python_version < \"3.8\""}
 
 [package.extras]
-format = ["idna", "jsonpointer (>1.13)", "rfc3987", "strict-rfc3339", "webcolors"]
-format_nongpl = ["idna", "jsonpointer (>1.13)", "webcolors", "rfc3986-validator (>0.1.0)", "rfc3339-validator"]
+format = ["fqdn", "idna", "isoduration", "jsonpointer (>1.13)", "rfc3339-validator", "rfc3987", "uri-template", "webcolors (>=1.11)"]
+format_nongpl = ["fqdn", "idna", "isoduration", "jsonpointer (>1.13)", "rfc3339-validator", "rfc3986-validator (>0.1.0)", "uri-template", "webcolors (>=1.11)"]
 
 [[package]]
 name = "mccabe"
@@ -249,34 +188,6 @@ category = "dev"
 optional = false
 python-versions = "*"
 
-[[package]]
-name = "mock"
-version = "3.0.5"
-description = "Rolling backport of unittest.mock for all Pythons"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[package.dependencies]
-funcsigs = {version = ">=1", markers = "python_version < \"3.3\""}
-six = "*"
-
-[package.extras]
-build = ["twine", "wheel", "blurb"]
-docs = ["sphinx"]
-test = ["pytest", "pytest-cov"]
-
-[[package]]
-name = "more-itertools"
-version = "5.0.0"
-description = "More routines for operating on iterables, beyond itertools"
-category = "dev"
-optional = false
-python-versions = "*"
-
-[package.dependencies]
-six = ">=1.0.0,<2.0.0"
-
 [[package]]
 name = "nodeenv"
 version = "1.6.0"
@@ -287,70 +198,74 @@ python-versions = "*"
 
 [[package]]
 name = "openapi-schema-validator"
-version = "0.1.6"
+version = "0.2.2"
 description = "OpenAPI schema validation for Python"
 category = "main"
 optional = false
-python-versions = ">= 2.7, != 3.0.*, != 3.1.*, != 3.2.*, != 3.3.*, != 3.4.*"
+python-versions = ">=3.7.0,<4.0.0"
 
 [package.dependencies]
-isodate = "*"
-jsonschema = ">=3.0.0"
-six = "*"
+jsonschema = ">=3.0.0,<5.0.0"
 
 [package.extras]
+rfc3339-validator = ["rfc3339-validator"]
+strict-rfc3339 = ["strict-rfc3339"]
 isodate = ["isodate"]
-rfc3339_validator = ["rfc3339-validator"]
-strict_rfc3339 = ["strict-rfc3339"]
 
 [[package]]
-name = "pathlib2"
-version = "2.3.6"
-description = "Object-oriented filesystem paths"
-category = "main"
+name = "packaging"
+version = "21.3"
+description = "Core utilities for Python packages"
+category = "dev"
 optional = false
-python-versions = "*"
+python-versions = ">=3.6"
 
 [package.dependencies]
-scandir = {version = "*", markers = "python_version < \"3.5\""}
-six = "*"
+pyparsing = ">=2.0.2,<3.0.5 || >3.0.5"
 
 [[package]]
 name = "platformdirs"
-version = "2.0.2"
+version = "2.4.1"
 description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=3.7"
+
+[package.extras]
+docs = ["Sphinx (>=4)", "furo (>=2021.7.5b38)", "proselint (>=0.10.2)", "sphinx-autodoc-typehints (>=1.12)"]
+test = ["appdirs (==1.4.4)", "pytest (>=6)", "pytest-cov (>=2.7)", "pytest-mock (>=3.6)"]
 
 [[package]]
 name = "pluggy"
-version = "0.6.0"
+version = "1.0.0"
 description = "plugin and hook calling mechanisms for python"
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=3.6"
+
+[package.dependencies]
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+testing = ["pytest", "pytest-benchmark"]
 
 [[package]]
 name = "pre-commit"
-version = "1.21.0"
+version = "2.17.0"
 description = "A framework for managing and maintaining multi-language pre-commit hooks."
 category = "dev"
 optional = true
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
+python-versions = ">=3.6.1"
 
 [package.dependencies]
-"aspy.yaml" = "*"
 cfgv = ">=2.0.0"
-futures = {version = "*", markers = "python_version < \"3.2\""}
 identify = ">=1.0.0"
 importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
-importlib-resources = {version = "*", markers = "python_version < \"3.7\""}
 nodeenv = ">=0.11.1"
-pyyaml = "*"
-six = "*"
+pyyaml = ">=5.1"
 toml = "*"
-virtualenv = ">=15.2"
+virtualenv = ">=20.0.8"
 
 [[package]]
 name = "py"
@@ -362,20 +277,31 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "pycodestyle"
-version = "2.7.0"
+version = "2.8.0"
 description = "Python style guide checker"
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "pyflakes"
-version = "2.3.1"
+version = "2.4.0"
 description = "passive checker of Python programs"
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
+[[package]]
+name = "pyparsing"
+version = "3.0.7"
+description = "Python parsing module"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.extras]
+diagrams = ["jinja2", "railroad-diagrams"]
+
 [[package]]
 name = "pyrsistent"
 version = "0.16.1"
@@ -389,32 +315,40 @@ six = "*"
 
 [[package]]
 name = "pytest"
-version = "3.5.0"
+version = "6.2.5"
 description = "pytest: simple powerful testing with Python"
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=3.6"
 
 [package.dependencies]
-attrs = ">=17.4.0"
+atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
+attrs = ">=19.2.0"
 colorama = {version = "*", markers = "sys_platform == \"win32\""}
-funcsigs = {version = "*", markers = "python_version < \"3.0\""}
-more-itertools = ">=4.0.0"
-pluggy = ">=0.5,<0.7"
-py = ">=1.5.0"
-six = ">=1.10.0"
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+iniconfig = "*"
+packaging = "*"
+pluggy = ">=0.12,<2.0"
+py = ">=1.8.2"
+toml = "*"
+
+[package.extras]
+testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
 
 [[package]]
 name = "pytest-cov"
-version = "2.5.1"
+version = "3.0.0"
 description = "Pytest plugin for measuring coverage."
 category = "dev"
 optional = false
-python-versions = "*"
+python-versions = ">=3.6"
 
 [package.dependencies]
-coverage = ">=3.7.1"
-pytest = ">=2.6.0"
+coverage = {version = ">=5.2.1", extras = ["toml"]}
+pytest = ">=4.6"
+
+[package.extras]
+testing = ["fields", "hunter", "process-tests", "six", "pytest-xdist", "virtualenv"]
 
 [[package]]
 name = "pytest-flake8"
@@ -430,52 +364,29 @@ pytest = ">=3.5"
 
 [[package]]
 name = "pyyaml"
-version = "5.3.1"
+version = "6.0"
 description = "YAML parser and emitter for Python"
 category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=3.6"
 
 [[package]]
 name = "requests"
-version = "2.25.1"
+version = "2.27.1"
 description = "Python HTTP for Humans."
 category = "main"
 optional = true
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
 
 [package.dependencies]
 certifi = ">=2017.4.17"
-chardet = ">=3.0.2,<5"
-idna = ">=2.5,<3"
+charset-normalizer = {version = ">=2.0.0,<2.1.0", markers = "python_version >= \"3\""}
+idna = {version = ">=2.5,<4", markers = "python_version >= \"3\""}
 urllib3 = ">=1.21.1,<1.27"
 
 [package.extras]
-security = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)"]
 socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]
-
-[[package]]
-name = "scandir"
-version = "1.10.0"
-description = "scandir, a better directory iterator and faster os.walk()"
-category = "main"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "singledispatch"
-version = "3.7.0"
-description = "Backport functools.singledispatch from Python 3.4 to Python 2.6-3.3."
-category = "dev"
-optional = false
-python-versions = ">=2.6"
-
-[package.dependencies]
-six = "*"
-
-[package.extras]
-docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=4.6)", "pytest-flake8", "pytest-cov", "pytest-black (>=0.3.7)", "unittest2", "pytest-checkdocs (>=2.4)"]
+use_chardet_on_py3 = ["chardet (>=3.0.2,<5)"]
 
 [[package]]
 name = "six"
@@ -493,43 +404,55 @@ category = "dev"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
+[[package]]
+name = "tomli"
+version = "2.0.0"
+description = "A lil' TOML parser"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
 [[package]]
 name = "tox"
-version = "3.12.1"
+version = "3.24.5"
 description = "tox is a generic virtualenv management and test command line tool"
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
 
 [package.dependencies]
-filelock = ">=3.0.0,<4"
-pluggy = ">=0.3.0,<1"
-py = ">=1.4.17,<2"
-six = ">=1.0.0,<2"
+colorama = {version = ">=0.4.1", markers = "platform_system == \"Windows\""}
+filelock = ">=3.0.0"
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+packaging = ">=14"
+pluggy = ">=0.12.0"
+py = ">=1.4.17"
+six = ">=1.14.0"
 toml = ">=0.9.4"
-virtualenv = ">=14.0.0"
+virtualenv = ">=16.0.0,<20.0.0 || >20.0.0,<20.0.1 || >20.0.1,<20.0.2 || >20.0.2,<20.0.3 || >20.0.3,<20.0.4 || >20.0.4,<20.0.5 || >20.0.5,<20.0.6 || >20.0.6,<20.0.7 || >20.0.7"
 
 [package.extras]
-docs = ["sphinx (>=2.0.0,<3)", "towncrier (>=18.5.0)", "pygments-github-lexers (>=0.0.5)", "sphinxcontrib-autoprogram (>=0.1.5)"]
-testing = ["freezegun (>=0.3.11,<1)", "pathlib2 (>=2.3.3,<3)", "pytest (>=3.0.0,<5)", "pytest-cov (>=2.5.1,<3)", "pytest-mock (>=1.10.0,<2)", "pytest-xdist (>=1.22.2,<2)", "pytest-randomly (>=1.2.3,<2)", "flaky (>=3.4.0,<4)", "psutil (>=5.6.1,<6)"]
+docs = ["pygments-github-lexers (>=0.0.5)", "sphinx (>=2.0.0)", "sphinxcontrib-autoprogram (>=0.1.5)", "towncrier (>=18.5.0)"]
+testing = ["flaky (>=3.4.0)", "freezegun (>=0.3.11)", "pytest (>=4.0.0)", "pytest-cov (>=2.5.1)", "pytest-mock (>=1.10.0)", "pytest-randomly (>=1.0.0)", "psutil (>=5.6.1)", "pathlib2 (>=2.3.3)"]
 
 [[package]]
-name = "typing"
-version = "3.10.0.0"
-description = "Type Hints for Python"
-category = "dev"
+name = "typing-extensions"
+version = "4.0.1"
+description = "Backported and Experimental Type Hints for Python 3.6+"
+category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, <3.5"
+python-versions = ">=3.6"
 
 [[package]]
 name = "urllib3"
-version = "1.22"
+version = "1.26.8"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
 category = "main"
 optional = true
-python-versions = "*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
 
 [package.extras]
+brotli = ["brotlipy (>=0.6.0)"]
 secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
 socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 
@@ -545,8 +468,6 @@ python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
 distlib = ">=0.3.1,<1"
 filelock = ">=3.2,<4"
 importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
-importlib-resources = {version = ">=1.0", markers = "python_version < \"3.7\""}
-pathlib2 = {version = ">=2.3.3,<3", markers = "python_version < \"3.4\" and sys_platform != \"win32\""}
 platformdirs = ">=2,<3"
 six = ">=1.9.0,<2"
 
@@ -556,18 +477,15 @@ testing = ["coverage (>=4)", "coverage-enable-subprocess (>=1)", "flaky (>=3)",
 
 [[package]]
 name = "zipp"
-version = "1.2.0"
+version = "3.7.0"
 description = "Backport of pathlib-compatible object wrapper for zip files"
 category = "main"
 optional = false
-python-versions = ">=2.7"
-
-[package.dependencies]
-contextlib2 = {version = "*", markers = "python_version < \"3.4\""}
+python-versions = ">=3.7"
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
-testing = ["pathlib2", "unittest2", "jaraco.itertools", "func-timeout"]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy"]
 
 [extras]
 dev = []
@@ -575,13 +493,13 @@ requests = ["requests"]
 
 [metadata]
 lock-version = "1.1"
-python-versions = ">= 2.7, != 3.0.*, != 3.1.*, != 3.2.*, != 3.3.*, != 3.4.*"
-content-hash = "d5e5096869c420cf8bdfd3c55f9e11e09580c86a60cb640d2b74bb03584ea78e"
+python-versions = "^3.7.0"
+content-hash = "134e2e38a04f952985a854bd4ffd3ece7f144c2cbf1b8fa58d4370b4711ebeb8"
 
 [metadata.files]
-"aspy.yaml" = [
-    {file = "aspy.yaml-1.3.0-py2.py3-none-any.whl", hash = "sha256:463372c043f70160a9ec950c3f1e4c3a82db5fca01d334b6bc89c7164d744bdc"},
-    {file = "aspy.yaml-1.3.0.tar.gz", hash = "sha256:e7c742382eff2caed61f87a39d13f99109088e5e93f04d76eb8d4b28aa143f45"},
+atomicwrites = [
+    {file = "atomicwrites-1.4.0-py2.py3-none-any.whl", hash = "sha256:6d1784dea7c0c8d4a5172b6c620f40b6e4cbfdf96d783691f2e1302a7b88e197"},
+    {file = "atomicwrites-1.4.0.tar.gz", hash = "sha256:ae70396ad1a434f9c7046fd2dd196fc04b12f9e91ffb859164193be8b6168a7a"},
 ]
 attrs = [
     {file = "attrs-21.4.0-py2.py3-none-any.whl", hash = "sha256:2d27e3784d7a565d36ab851fe94887c5eccd6a463168875832a1be79c82828b4"},
@@ -592,221 +510,196 @@ certifi = [
     {file = "certifi-2021.10.8.tar.gz", hash = "sha256:78884e7c1d4b00ce3cea67b44566851c4343c120abd683433ce934a68ea58872"},
 ]
 cfgv = [
-    {file = "cfgv-2.0.1-py2.py3-none-any.whl", hash = "sha256:fbd93c9ab0a523bf7daec408f3be2ed99a980e20b2d19b50fc184ca6b820d289"},
-    {file = "cfgv-2.0.1.tar.gz", hash = "sha256:edb387943b665bf9c434f717bf630fa78aecd53d5900d2e05da6ad6048553144"},
+    {file = "cfgv-3.3.1-py2.py3-none-any.whl", hash = "sha256:c6a0883f3917a037485059700b9e75da2464e6c27051014ad85ba6aaa5884426"},
+    {file = "cfgv-3.3.1.tar.gz", hash = "sha256:f5a830efb9ce7a445376bb66ec94c638a9787422f96264c98edc6bdeed8ab736"},
 ]
-chardet = [
-    {file = "chardet-4.0.0-py2.py3-none-any.whl", hash = "sha256:f864054d66fd9118f2e67044ac8981a54775ec5b67aed0441892edb553d21da5"},
-    {file = "chardet-4.0.0.tar.gz", hash = "sha256:0d6f53a15db4120f2b08c94f11e7d93d2c911ee118b6b30a04ec3ee8310179fa"},
+charset-normalizer = [
+    {file = "charset-normalizer-2.0.10.tar.gz", hash = "sha256:876d180e9d7432c5d1dfd4c5d26b72f099d503e8fcc0feb7532c9289be60fcbd"},
+    {file = "charset_normalizer-2.0.10-py3-none-any.whl", hash = "sha256:cb957888737fc0bbcd78e3df769addb41fd1ff8cf950dc9e7ad7793f1bf44455"},
 ]
 colorama = [
     {file = "colorama-0.4.4-py2.py3-none-any.whl", hash = "sha256:9f47eda37229f68eee03b24b9748937c7dc3868f906e8ba69fbcbdd3bc5dc3e2"},
     {file = "colorama-0.4.4.tar.gz", hash = "sha256:5941b2b48a20143d2267e95b1c2a7603ce057ee39fd88e7329b0c292aa16869b"},
 ]
-configparser = [
-    {file = "configparser-4.0.2-py2.py3-none-any.whl", hash = "sha256:254c1d9c79f60c45dfde850850883d5aaa7f19a23f13561243a050d5a7c3fe4c"},
-    {file = "configparser-4.0.2.tar.gz", hash = "sha256:c7d282687a5308319bf3d2e7706e575c635b0a470342641c93bea0ea3b5331df"},
-]
-contextlib2 = [
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-    {file = "contextlib2-0.6.0.post1.tar.gz", hash = "sha256:01f490098c18b19d2bd5bb5dc445b2054d2fa97f09a4280ba2c5f3c394c8162e"},
-]
 coverage = [
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+    {file = "PyYAML-6.0-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:055d937d65826939cb044fc8c9b08889e8c743fdc6a32b33e2390f66013e449b"},
+    {file = "PyYAML-6.0-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:e61ceaab6f49fb8bdfaa0f92c4b57bcfbea54c09277b1b4f7ac376bfb7a7c174"},
+    {file = "PyYAML-6.0-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:d67d839ede4ed1b28a4e8909735fc992a923cdb84e618544973d7dfc71540803"},
+    {file = "PyYAML-6.0-cp39-cp39-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:cba8c411ef271aa037d7357a2bc8f9ee8b58b9965831d9e51baf703280dc73d3"},
+    {file = "PyYAML-6.0-cp39-cp39-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:40527857252b61eacd1d9af500c3337ba8deb8fc298940291486c465c8b46ec0"},
+    {file = "PyYAML-6.0-cp39-cp39-win32.whl", hash = "sha256:b5b9eccad747aabaaffbc6064800670f0c297e52c12754eb1d976c57e4f74dcb"},
+    {file = "PyYAML-6.0-cp39-cp39-win_amd64.whl", hash = "sha256:b3d267842bf12586ba6c734f89d1f5b871df0273157918b0ccefa29deb05c21c"},
+    {file = "PyYAML-6.0.tar.gz", hash = "sha256:68fb519c14306fec9720a2a5b45bc9f0c8d1b9c72adf45c37baedfcd949c35a2"},
 ]
 requests = [
-    {file = "requests-2.25.1-py2.py3-none-any.whl", hash = "sha256:c210084e36a42ae6b9219e00e48287def368a26d03a048ddad7bfee44f75871e"},
-    {file = "requests-2.25.1.tar.gz", hash = "sha256:27973dd4a904a4f13b263a19c866c13b92a39ed1c964655f025f3f8d3d75b804"},
-]
-scandir = [
-    {file = "scandir-1.10.0-cp27-cp27m-win32.whl", hash = "sha256:92c85ac42f41ffdc35b6da57ed991575bdbe69db895507af88b9f499b701c188"},
-    {file = "scandir-1.10.0-cp27-cp27m-win_amd64.whl", hash = "sha256:cb925555f43060a1745d0a321cca94bcea927c50114b623d73179189a4e100ac"},
-    {file = "scandir-1.10.0-cp34-cp34m-win32.whl", hash = "sha256:2c712840c2e2ee8dfaf36034080108d30060d759c7b73a01a52251cc8989f11f"},
-    {file = "scandir-1.10.0-cp34-cp34m-win_amd64.whl", hash = "sha256:2586c94e907d99617887daed6c1d102b5ca28f1085f90446554abf1faf73123e"},
-    {file = "scandir-1.10.0-cp35-cp35m-win32.whl", hash = "sha256:2b8e3888b11abb2217a32af0766bc06b65cc4a928d8727828ee68af5a967fa6f"},
-    {file = "scandir-1.10.0-cp35-cp35m-win_amd64.whl", hash = "sha256:8c5922863e44ffc00c5c693190648daa6d15e7c1207ed02d6f46a8dcc2869d32"},
-    {file = "scandir-1.10.0-cp36-cp36m-win32.whl", hash = "sha256:2ae41f43797ca0c11591c0c35f2f5875fa99f8797cb1a1fd440497ec0ae4b022"},
-    {file = "scandir-1.10.0-cp36-cp36m-win_amd64.whl", hash = "sha256:7d2d7a06a252764061a020407b997dd036f7bd6a175a5ba2b345f0a357f0b3f4"},
-    {file = "scandir-1.10.0-cp37-cp37m-win32.whl", hash = "sha256:67f15b6f83e6507fdc6fca22fedf6ef8b334b399ca27c6b568cbfaa82a364173"},
-    {file = "scandir-1.10.0-cp37-cp37m-win_amd64.whl", hash = "sha256:b24086f2375c4a094a6b51e78b4cf7ca16c721dcee2eddd7aa6494b42d6d519d"},
-    {file = "scandir-1.10.0.tar.gz", hash = "sha256:4d4631f6062e658e9007ab3149a9b914f3548cb38bfb021c64f39a025ce578ae"},
-]
-singledispatch = [
-    {file = "singledispatch-3.7.0-py2.py3-none-any.whl", hash = "sha256:bc77afa97c8a22596d6d4fc20f1b7bdd2b86edc2a65a4262bdd7cc3cc19aa989"},
-    {file = "singledispatch-3.7.0.tar.gz", hash = "sha256:c1a4d5c1da310c3fd8fccfb8d4e1cb7df076148fd5d858a819e37fffe44f3092"},
+    {file = "requests-2.27.1-py2.py3-none-any.whl", hash = "sha256:f22fa1e554c9ddfd16e6e41ac79759e17be9e492b3587efa038054674760e72d"},
+    {file = "requests-2.27.1.tar.gz", hash = "sha256:68d7c56fd5a8999887728ef304a6d12edc7be74f1cfa47714fc8b414525c9a61"},
 ]
 six = [
     {file = "six-1.16.0-py2.py3-none-any.whl", hash = "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"},
@@ -816,24 +709,27 @@ toml = [
     {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
     {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
 ]
+tomli = [
+    {file = "tomli-2.0.0-py3-none-any.whl", hash = "sha256:b5bde28da1fed24b9bd1d4d2b8cba62300bfb4ec9a6187a957e8ddb9434c5224"},
+    {file = "tomli-2.0.0.tar.gz", hash = "sha256:c292c34f58502a1eb2bbb9f5bbc9a5ebc37bee10ffb8c2d6bbdfa8eb13cc14e1"},
+]
 tox = [
-    {file = "tox-3.12.1-py2.py3-none-any.whl", hash = "sha256:f5c8e446b51edd2ea97df31d4ded8c8b72e7d6c619519da6bb6084b9dd5770f9"},
-    {file = "tox-3.12.1.tar.gz", hash = "sha256:f87fd33892a2df0950e5e034def9468988b8d008c7e9416be665fcc0dd45b14f"},
+    {file = "tox-3.24.5-py2.py3-none-any.whl", hash = "sha256:be3362472a33094bce26727f5f771ca0facf6dafa217f65875314e9a6600c95c"},
+    {file = "tox-3.24.5.tar.gz", hash = "sha256:67e0e32c90e278251fea45b696d0fef3879089ccbe979b0c556d35d5a70e2993"},
 ]
-typing = [
-    {file = "typing-3.10.0.0-py2-none-any.whl", hash = "sha256:c7219ef20c5fbf413b4567092adfc46fa6203cb8454eda33c3fc1afe1398a308"},
-    {file = "typing-3.10.0.0-py3-none-any.whl", hash = "sha256:12fbdfbe7d6cca1a42e485229afcb0b0c8259258cfb919b8a5e2a5c953742f89"},
-    {file = "typing-3.10.0.0.tar.gz", hash = "sha256:13b4ad211f54ddbf93e5901a9967b1e07720c1d1b78d596ac6a439641aa1b130"},
+typing-extensions = [
+    {file = "typing_extensions-4.0.1-py3-none-any.whl", hash = "sha256:7f001e5ac290a0c0401508864c7ec868be4e701886d5b573a9528ed3973d9d3b"},
+    {file = "typing_extensions-4.0.1.tar.gz", hash = "sha256:4ca091dea149f945ec56afb48dae714f21e8692ef22a395223bcd328961b6a0e"},
 ]
 urllib3 = [
-    {file = "urllib3-1.22-py2.py3-none-any.whl", hash = "sha256:06330f386d6e4b195fbfc736b297f58c5a892e4440e54d294d7004e3a9bbea1b"},
-    {file = "urllib3-1.22.tar.gz", hash = "sha256:cc44da8e1145637334317feebd728bd869a35285b93cbb4cca2577da7e62db4f"},
+    {file = "urllib3-1.26.8-py2.py3-none-any.whl", hash = "sha256:000ca7f471a233c2251c6c7023ee85305721bfdf18621ebff4fd17a8653427ed"},
+    {file = "urllib3-1.26.8.tar.gz", hash = "sha256:0e7c33d9a63e7ddfcb86780aac87befc2fbddf46c58dbb487e0855f7ceec283c"},
 ]
 virtualenv = [
     {file = "virtualenv-20.13.0-py2.py3-none-any.whl", hash = "sha256:339f16c4a86b44240ba7223d0f93a7887c3ca04b5f9c8129da7958447d079b09"},
     {file = "virtualenv-20.13.0.tar.gz", hash = "sha256:d8458cf8d59d0ea495ad9b34c2599487f8a7772d796f9910858376d1600dd2dd"},
 ]
 zipp = [
-    {file = "zipp-1.2.0-py2.py3-none-any.whl", hash = "sha256:e0d9e63797e483a30d27e09fffd308c59a700d365ec34e93cc100844168bf921"},
-    {file = "zipp-1.2.0.tar.gz", hash = "sha256:c70410551488251b0fee67b460fb9a536af8d6f9f008ad10ac51f615b6a521b1"},
+    {file = "zipp-3.7.0-py3-none-any.whl", hash = "sha256:b47250dd24f92b7dd6a0a8fc5244da14608f3ca90a5efcd37a3b1642fac9a375"},
+    {file = "zipp-3.7.0.tar.gz", hash = "sha256:9f50f446828eb9d45b267433fd3e9da8d801f614129124863f9c51ebceafb87d"},
 ]
diff --git a/pyproject.toml b/pyproject.toml
index 9180bdd1..46fffb48 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,37 +23,32 @@ classifiers = [
     "Intended Audience :: Developers",
     "Topic :: Software Development :: Libraries :: Python Modules",
     "Operating System :: OS Independent",
-    "Programming Language :: Python :: 2.7",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.5",
-    "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",
     "Topic :: Software Development :: Libraries"
 ]
 
 [tool.poetry.dependencies]
-jsonschema = ">=3.2.0, <4.0.0"
-openapi-schema-validator = "<0.2.0"
-pathlib2 = {version = "*", python = "~2.7"}
+jsonschema = ">=3.2.0, <5.0.0"
+openapi-schema-validator = "^0.2.0"
 pyrsistent = "<0.17.0"
-python = ">= 2.7, != 3.0.*, != 3.1.*, != 3.2.*, != 3.3.*, != 3.4.*"
+python = "^3.7.0"
 PyYAML = ">=5.1"
 requests = {version = "*", optional = true}
 setuptools = "*"
-six = "*"
 
 [tool.poetry.extras]
 dev = ["pre-commit"]
 requests = ["requests"]
 
 [tool.poetry.dev-dependencies]
-mock = {version = "*", python = "~2.7"}
 pre-commit =  {version = "*", optional = true}
-pytest = "=3.5.0"
+pytest = "^6.2.5"
 pytest-flake8 = "=1.0.7"
-pytest-cov = "=2.5.1"
+pytest-cov = "^3.0.0"
 tox = "*"
 
 [tool.poetry.scripts]
diff --git a/tests/integration/conftest.py b/tests/integration/conftest.py
index a83ced19..6418a76b 100644
--- a/tests/integration/conftest.py
+++ b/tests/integration/conftest.py
@@ -1,8 +1,8 @@
 from os import path
 
 import pytest
-from six.moves.urllib import request
-from six.moves.urllib.parse import urlunparse
+from urllib import request
+from urllib.parse import urlunparse
 from yaml import safe_load
 
 from openapi_spec_validator import (openapi_v3_spec_validator,
diff --git a/tests/integration/test_main.py b/tests/integration/test_main.py
index 081dce87..979ae0c9 100644
--- a/tests/integration/test_main.py
+++ b/tests/integration/test_main.py
@@ -1,12 +1,9 @@
 import pytest
-from six import StringIO
+from io import StringIO
 
 from openapi_spec_validator.__main__ import main
 
-try:
-    from unittest import mock
-except ImportError:
-    import mock
+from unittest import mock
 
 
 def test_schema_default():
diff --git a/tox.ini b/tox.ini
index e582da4c..0f995222 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = {py27,py35,py36}-{default,simplejson}
+envlist = {py37,py38,py39,py310}-{default,simplejson}
 
 [testenv]
 deps =
