diff --git a/docs/conftest.py b/docs/conftest.py
index 8128402b..3f7f7513 100644
--- a/docs/conftest.py
+++ b/docs/conftest.py
@@ -2,7 +2,10 @@
 from doctest import ELLIPSIS, NORMALIZE_WHITESPACE
 
 from sybil import Sybil
-from sybil.parsers.codeblock import CodeBlockParser
+try:
+    from sybil.parsers.codeblock import PythonCodeBlockParser
+except ImportError:
+    from sybil.parsers.codeblock import CodeBlockParser as PythonCodeBlockParser
 from sybil.parsers.doctest import DocTestParser
 from sybil.parsers.skip import skip
 
@@ -22,7 +25,7 @@ def setup(namespace):
 pytest_collect_file = Sybil(
     parsers=[
         DocTestParser(optionflags=ELLIPSIS | NORMALIZE_WHITESPACE),
-        CodeBlockParser(future_imports=['print_function']),
+        PythonCodeBlockParser(future_imports=['print_function']),
         skip,
     ],
     pattern='*.rst',
diff --git a/pytest.ini b/pytest.ini
index 64d6b548..2b406089 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -2,6 +2,7 @@
 addopts = --assert=plain --doctest-modules --ignore=setup.py
 flake8-ignore =
     E203
+    docs/conftest.py E501
     parsel/csstranslator.py E501
     parsel/selector.py E501
     parsel/utils.py E226 E501
diff --git a/tox.ini b/tox.ini
index 25d03fd9..52c08e58 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,6 +16,7 @@ commands =
 [testenv:flake8]
 deps =
     {[testenv]deps}
+    flake8<4  # https://github.com/tholo/pytest-flake8/issues/81
     pytest-flake8
 commands =
     pytest --flake8