diff --git a/pyproject.toml b/pyproject.toml
index 195be69..b7f25c4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -58,7 +58,7 @@ commands = pytest test/ --cov={toxinidir}/simple_message_channels/ --no-cov-on-f
 [testenv:lint]
 skipdist = True
 deps = flake8
-commands = flake8 {posargs:--max-line-length 80} simple_message_channels/ test/
+commands = flake8 {posargs:--max-line-length 80} --ignore="E203" simple_message_channels/ test/
 
 [testenv:sort]
 skipdist = True
diff --git a/simple_message_channels/smc.py b/simple_message_channels/smc.py
index 06a2e28..60ad387 100644
--- a/simple_message_channels/smc.py
+++ b/simple_message_channels/smc.py
@@ -1,5 +1,5 @@
 """Sans I/O wire protocol for Hypercore"""
-from typing import List, Optional, Tuple
+from typing import List, Tuple
 
 import attr
 from pyvarint import encode, encoding_length
diff --git a/test/conftest.py b/test/conftest.py
index 586f19c..2d09c66 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -1,4 +1,5 @@
 import pytest
+
 from simple_message_channels import SimpleMessageChannel as SMC