diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index faf9767..5a6b83e 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -22,6 +22,6 @@ repos:
     - id: flake8
 
   - repo: https://github.com/psf/black-pre-commit-mirror
-    rev: 25.9.0
+    rev: 26.1.0
     hooks:
       - id: black
diff --git a/sphinx_proof/__init__.py b/sphinx_proof/__init__.py
index 61046f3..438e9f4 100644
--- a/sphinx_proof/__init__.py
+++ b/sphinx_proof/__init__.py
@@ -5,6 +5,7 @@
 
 A Sphinx extension for producing proofs, theorems, lemmas, etc.
 """
+
 import os
 from pathlib import Path
 from typing import Any, Dict, Set, Union