diff --git a/.github/workflows/black_format.yml b/.github/workflows/black_format.yml
deleted file mode 100644
index 9969d6154..000000000
--- a/.github/workflows/black_format.yml
+++ /dev/null
@@ -1,25 +0,0 @@
-name: Format Python code with Black
-
-on: [pull_request]
-
-jobs:
-  black:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python
-      uses: actions/setup-python@v2
-      with:
-        python-version: '3.x' # Set the Python version you want to use
-    - name: Install Black
-      run: pip install black
-    - name: Run Black Check
-      run: black --check .
-    - name: Run Black Format
-      if: failure()
-      run: |
-        black . --exclude '/(\.ipynb)/' # Exclude .ipynb files in formatting
-        git config --global user.name 'github-actions[bot]'
-        git config --global user.email 'github-actions[bot]@users.noreply.github.com'
-        git commit -am "Apply Black Formatting" --allow-empty
-        git push origin HEAD:${{ github.head_ref }} # Push to the correct branch
\ No newline at end of file
diff --git a/mlxtend/classifier/tests/test_stacking_classifier.py b/mlxtend/classifier/tests/test_stacking_classifier.py
index 6bca57ff0..d116b57dc 100644
--- a/mlxtend/classifier/tests/test_stacking_classifier.py
+++ b/mlxtend/classifier/tests/test_stacking_classifier.py
@@ -550,7 +550,7 @@ def test_decision_function():
 
     if Version(sklearn_version) < Version("0.21"):
         assert scores_mean == 0.96, scores_mean
-    elif platform.system() == 'Darwin':
+    elif platform.system() == "Darwin":
         assert scores_mean == 0.93, scores_mean
     else:
         assert scores_mean == 0.94, scores_mean