diff --git a/anfema_django_testutils/runner.py b/anfema_django_testutils/runner.py
index 5821b8c..20590e0 100644
--- a/anfema_django_testutils/runner.py
+++ b/anfema_django_testutils/runner.py
@@ -367,8 +367,8 @@ def _resolve_subtests_results(
             {len(header)*"-"}
             """
                 )
-                + self._exc_info_to_string(err, test)
-                + 2 * '\n'
+                + self._exc_info_to_string(err, test)  # noqa: W503
+                + 2 * '\n'  # noqa: W503
             )
             result_priority = min(result_priority_map[result], result_priority)
         result = reverse_result_priority_map[result_priority]
diff --git a/pyproject.toml b/pyproject.toml
index 63f3abc..2b3e97a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -69,5 +69,5 @@ known_django = "django"
 sections = ["FUTURE", "STDLIB", "DJANGO", "THIRDPARTY", "FIRSTPARTY", "LOCALFOLDER"]
 lines_after_imports = 2
 
-[tool.flake8]
-max-line-length = 120
+[tool.flakeheaven]
+max_line_length = 120
diff --git a/tox.ini b/tox.ini
index 5448c40..7ddf547 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,7 @@ minversion = 3.18
 envlist =
     py{39,310}-django32
     py{39,310,311}-django{41,42}
-    flake8
+    flake
     isort
     black
 
@@ -18,12 +18,12 @@ setenv =
 commands =
     python -m unittest discover -s "{toxinidir}/tests"
 
-[testenv:flake8]
+[testenv:flake]
 description = Checks the code for compliance with Flake8 coding standards.
 basepython = python3.11
 changedir = {toxinidir}
-deps = flake8-pyproject
-commands = flake8 anfema_django_testutils tests
+deps = flakeheaven
+commands = flakeheaven lint anfema_django_testutils tests
 
 [testenv:isort]
 description = Checks if imports are in the correct order and correctly formatted.