diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ddfc4f4..760e04b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -29,21 +29,21 @@ jobs:
 
       - name: Check Python formatting with black
         run: |
-          black --line-length 99 --diff --color .
-          black --line-length=99 --check .
+          black --diff --color .
+          black --check .
 
       - name: Check Cython formatting with cython-lint
         run: |
-          cython-lint --max-line-length=99 --ignore=E741 .
+          cython-lint .
 
       - name: Check import order with isort
         run: |
-          isort --profile=black --line-length=99 --check .
+          isort --profile=black --check .
 
       - name: Lint with flake8
         run: |
-          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics || exit 1
-          flake8 . --count --exit-zero --max-line-length=99 --statistics
+          flake8 . --count --select=E9,F7,F63,F82 --show-source --statistics || exit 1
+          flake8 . --count --exit-zero --statistics
 
       - name: Test with pytest
         run: |
diff --git a/pyproject.toml b/pyproject.toml
index 7cd678e..5f31e76 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,16 +11,16 @@ requires = [
 
 [tool.black]
 line-length = 99
-target_version = ["py38", "py39", "py310", "py311", "py312"]
 preview = true
+target_version = ["py38", "py39", "py310", "py311", "py312"]
 
 [tool.cython-lint]
-max-line-length = 99
 ignore = ["E741"]
+max-line-length = 99
 
 [tool.isort]
-multi_line_output = 3
-include_trailing_comma = true
 force_grid_wrap = 0
-use_parentheses = true
+include_trailing_comma = true
 line_length = 99
+multi_line_output = 3
+use_parentheses = true
diff --git a/quantile_forest/_quantile_forest.py b/quantile_forest/_quantile_forest.py
index 3b91ed7..07713a0 100755
--- a/quantile_forest/_quantile_forest.py
+++ b/quantile_forest/_quantile_forest.py
@@ -202,8 +202,8 @@ def fit(self, X, y, sample_weight=None, sparse_pickle=False):
 
         return self
 
+    @staticmethod
     def _map_indices_to_leaves(
-        self,
         bootstrap_indices,
         X_leaves_bootstrap,
         sample_weight,
diff --git a/setup.cfg b/setup.cfg
index d96c271..1c81f92 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -8,20 +8,20 @@ include = quantile_forest*
 test = pytest
 
 [tool:pytest]
-testpaths = quantile_forest
 addopts =
-    --doctest-modules
-    --disable-pytest-warnings
     --color=yes
+    --disable-pytest-warnings
+    --doctest-modules
+testpaths = quantile_forest
 
 [flake8]
-max-line-length = 99
-ignore = E203, E266, E402, E501, W503, E731
-select = B,C,E,F,W,T4,B9
 exclude =
     .git,
     build,
     __pycache__
+ignore = E203, E402, E731, W503
+max-line-length = 99
+select = B, B9, C, E, F, T4, W
 
 [metadata]
 description_file = README.md