diff --git a/mumax3c/__init__.py b/mumax3c/__init__.py
index 0765f02..adcb49e 100644
--- a/mumax3c/__init__.py
+++ b/mumax3c/__init__.py
@@ -1,4 +1,5 @@
 """Mumax3 calculator."""
+
 import importlib.metadata
 
 import pytest
diff --git a/mumax3c/scripts/util.py b/mumax3c/scripts/util.py
index 9d905b4..949352e 100644
--- a/mumax3c/scripts/util.py
+++ b/mumax3c/scripts/util.py
@@ -55,9 +55,9 @@ def mumax3_regions(system, ovf_format="bin4", abspath=True):
                 continue
             unique_index += 1
             mx3 += f"Msat.setregion({unique_index}, {ms})\n"
-            region_indices[
-                (sr_indices == sr_index) & np.isclose(Ms_array, ms)
-            ] = unique_index
+            region_indices[(sr_indices == sr_index) & np.isclose(Ms_array, ms)] = (
+                unique_index
+            )
             region_relator[sr_name].append(unique_index)
 
     if unique_index > max_index:
diff --git a/tasks.py b/tasks.py
index 8bf080b..6cb0ed3 100644
--- a/tasks.py
+++ b/tasks.py
@@ -1,4 +1,5 @@
 """Tasks to release the package."""
+
 import os
 import shutil