diff --git a/sphinx_nefertiti/__init__.py b/sphinx_nefertiti/__init__.py
index f8c4664..1eb81ea 100644
--- a/sphinx_nefertiti/__init__.py
+++ b/sphinx_nefertiti/__init__.py
@@ -61,14 +61,16 @@ def copy_nefertiti_files(app, exc):
     rename_files = [  # Tuples: (orig_name, rename_to)
         (
             "sphinx-nefertiti.min.js",
-            f"sphinx-nefertiti-{utils.get_version()}.min.js"
-        ), (
+            f"sphinx-nefertiti-{utils.get_version()}.min.js",
+        ),
+        (
             "sphinx-nefertiti.min.js.map",
-            f"sphinx-nefertiti-{utils.get_version()}.min.js.map"
-        ), (
+            f"sphinx-nefertiti-{utils.get_version()}.min.js.map",
+        ),
+        (
             "bootstrap.bundle.min.js",
             f"bootstrap.bundle-{utils.get_version()}.min.js",
-        )
+        ),
     ]
     for orig_name, rename_to in rename_files:
         orig_path = static_path / orig_name
diff --git a/sphinx_nefertiti/utils.py b/sphinx_nefertiti/utils.py
index 51cde76..ed30783 100644
--- a/sphinx_nefertiti/utils.py
+++ b/sphinx_nefertiti/utils.py
@@ -1,9 +1,9 @@
-_CURRENT_VERSION = (0, 3, 1, 'f', 0)  # following PEP 440
+_CURRENT_VERSION = (0, 3, 1, "f", 0)  # following PEP 440
 
 
 def get_version():
     major, minor, patch, letter, subv = _CURRENT_VERSION
-    ver = '%s.%s.%s' % (major, minor, patch)
-    if letter != 'f':
-        ver = '%s%s%s' % (ver, letter, subv)
+    ver = "%s.%s.%s" % (major, minor, patch)
+    if letter != "f":
+        ver = "%s%s%s" % (ver, letter, subv)
     return ver