diff --git a/update_version.py b/update_version.py
index 54a47e4..6cf194b 100644
--- a/update_version.py
+++ b/update_version.py
@@ -27,11 +27,13 @@ def validate_version(version: str) -> bool:
     Returns:
         True if valid, False otherwise
     """
-    pattern = r'^\d+\.\d+\.\d+(?:-[a-zA-Z0-9]+)?$'
+    pattern = r"^\d+\.\d+\.\d+(?:-[a-zA-Z0-9]+)?$"
     return bool(re.match(pattern, version))
 
 
-def update_file(file_path: Path, old_pattern: str, new_version: str, multiline: bool = False) -> bool:
+def update_file(
+    file_path: Path, old_pattern: str, new_version: str, multiline: bool = False
+) -> bool:
     """Update version in a file.
 
     Args:
@@ -94,10 +96,7 @@ def main() -> int:
         # Use word boundary to match 'version' but not 'python_version'
         pattern = r'^version = "[^"]+"'
         success &= update_file(
-            pyproject_path,
-            pattern,
-            f'version = "{new_version}"',
-            multiline=True
+            pyproject_path, pattern, f'version = "{new_version}"', multiline=True
         )
     else:
         print(f"✗ {pyproject_path} not found")
@@ -106,11 +105,7 @@ def main() -> int:
     # Update __init__.py
     if init_path.exists():
         pattern = r'__version__ = "[^"]+"'
-        success &= update_file(
-            init_path,
-            pattern,
-            f'__version__ = "{new_version}"'
-        )
+        success &= update_file(init_path, pattern, f'__version__ = "{new_version}"')
     else:
         print(f"✗ {init_path} not found")
         success = False