diff --git a/selfprivacy_api/migrations/__init__.py b/selfprivacy_api/migrations/__init__.py
index 6a7723c..61097a7 100644
--- a/selfprivacy_api/migrations/__init__.py
+++ b/selfprivacy_api/migrations/__init__.py
@@ -1,9 +1,8 @@
 from selfprivacy_api.utils import ReadUserData
 from selfprivacy_api.migrations.fix_nixos_config_branch import FixNixosConfigBranch
 
-migrations = [
-    FixNixosConfigBranch()
-]
+migrations = [FixNixosConfigBranch()]
+
 
 def run_migrations():
     """
diff --git a/selfprivacy_api/migrations/fix_nixos_config_branch.py b/selfprivacy_api/migrations/fix_nixos_config_branch.py
index af36c67..26f4ff7 100644
--- a/selfprivacy_api/migrations/fix_nixos_config_branch.py
+++ b/selfprivacy_api/migrations/fix_nixos_config_branch.py
@@ -3,6 +3,7 @@ import subprocess
 
 from selfprivacy_api.migrations.migration import Migration
 
+
 class FixNixosConfigBranch(Migration):
     def get_migration_name(self):
         return "fix_nixos_config_branch"
@@ -16,12 +17,13 @@ class FixNixosConfigBranch(Migration):
 
     def is_migration_needed(self):
         """Check the current branch of /etc/nixos and return True if it is rolling-testing"""
-        nixos_config_branch = subprocess.check_output(["git", "rev-parse", "--abbrev-ref", "HEAD"], start_new_session=True)
+        nixos_config_branch = subprocess.check_output(
+            ["git", "rev-parse", "--abbrev-ref", "HEAD"], start_new_session=True
+        )
         if nixos_config_branch.decode("utf-8").strip() == "rolling-testing":
             return True
         else:
             return False
-        
 
     def migrate(self):
         """Affected server pulled the config with the --single-branch flag.
@@ -32,10 +34,17 @@ class FixNixosConfigBranch(Migration):
         current_working_directory = os.getcwd()
         os.chdir("/etc/nixos")
 
-        subprocess.check_output(["git", "config", "remote.origin.fetch", "+refs/heads/*:refs/remotes/origin/*"])
+        subprocess.check_output(
+            [
+                "git",
+                "config",
+                "remote.origin.fetch",
+                "+refs/heads/*:refs/remotes/origin/*",
+            ]
+        )
         subprocess.check_output(["git", "fetch", "--all"])
         subprocess.check_output(["git", "pull"])
         subprocess.check_output(["git", "checkout", "master"])
 
         os.chdir(current_working_directory)
-        print("Done")
\ No newline at end of file
+        print("Done")
diff --git a/selfprivacy_api/migrations/migration.py b/selfprivacy_api/migrations/migration.py
index e5a37db..b8ae261 100644
--- a/selfprivacy_api/migrations/migration.py
+++ b/selfprivacy_api/migrations/migration.py
@@ -8,6 +8,8 @@ Migration has a function migrate() that does the migration
 Migration has a function get_migration_name() that returns the migration name
 Migration has a function get_migration_description() that returns the migration description
 """
+
+
 class Migration(ABC):
     @abstractmethod
     def get_migration_name(self):