diff --git a/pytest.ini b/pytest.ini
index 9aeecb5..74cc64a 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -2,10 +2,7 @@
 addopts =
     -rfEsxX
     -p no:logging
-    --mccabe
     --verbose
-    --pep8
-    --flake8
     --ignore=setup.py
     --ignore=travis_pypi_setup.py
     --cov=src/related/
@@ -13,18 +10,5 @@ addopts =
     --cov-report=html
     --cov-fail-under=98
 
-exclude_lines =
-    pragma: no cover
-    def __repr__
-    if self.debug:
-    if settings.DEBUG
-    raise AssertionError
-    raise NotImplementedError
-    if 0:
-    if __name__ == .__main__.:
-
-python_paths = src/
-test_paths = tests
-mccabe-complexity=7
+pythonpath = src/
 norecursedirs=example docs build env .*
-pep8maxlinelength = 80
diff --git a/tox.ini b/tox.ini
index e0b1db1..a53be8a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,15 +1,10 @@
 [tox]
 envlist =
-    py27
-    py35
     py36
     py37
-    flake8
-
-[testenv:flake8]
-basepython = python
-deps = flake8
-commands = flake8 related
+    py38
+    py39
+    py310
 
 [testenv]
 setenv =