diff --git a/.github/workflows/formatter.yml b/.github/workflows/formatter.yml
index 6b37756..2ce093c 100644
--- a/.github/workflows/formatter.yml
+++ b/.github/workflows/formatter.yml
@@ -1,9 +1,9 @@
 name: Python Formatter (isort & black)
 
 on:
+  push:
+    branches: 'main'
   pull_request:
-    branches: [main]
-
 jobs:
   formatting:
     runs-on: ubuntu-latest
diff --git a/pyproject.toml b/pyproject.toml
index d78f6bd..8dcf968 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,3 +9,4 @@ include_trailing_comma = true
 
 [tool.black]
 line_length = 120
+exclude = "migrations/"
diff --git a/setup.cfg b/setup.cfg
index 4ea2237..53698c9 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -32,7 +32,6 @@ tests =
     pytest
     pytest-cov
     pytest-xdist
-    pytest-django
 django_tests =
     pytest-django
 django =
diff --git a/src/sio3pack/django/sinolpack/handler.py b/src/sio3pack/django/sinolpack/handler.py
index 2b47e46..0ae67e7 100644
--- a/src/sio3pack/django/sinolpack/handler.py
+++ b/src/sio3pack/django/sinolpack/handler.py
@@ -4,7 +4,6 @@
 
 
 class SinolpackDjangoHandler(DjangoHandler):
-
     def save_to_db(self):
         """
         Save the package to the database.
diff --git a/src/sio3pack/packages/sinolpack/model.py b/src/sio3pack/packages/sinolpack/model.py
index 55fa144..9d31864 100644
--- a/src/sio3pack/packages/sinolpack/model.py
+++ b/src/sio3pack/packages/sinolpack/model.py
@@ -215,7 +215,8 @@ def get_submittable_extensions(self):
         Returns a list of extensions that are submittable.
         """
         return self.config.get(
-            "submittable_langs", self._get_from_django_settings("SUBMITTABLE_LANGUAGES", ["c", "cpp", "cc", "cxx", "py"])
+            "submittable_langs",
+            self._get_from_django_settings("SUBMITTABLE_LANGUAGES", ["c", "cpp", "cc", "cxx", "py"]),
         )
 
     def get_model_solution_regex(self):