diff --git a/pyWebLayout/io/readers/epub_reader.py b/pyWebLayout/io/readers/epub_reader.py
index bc11e97..1856694 100644
--- a/pyWebLayout/io/readers/epub_reader.py
+++ b/pyWebLayout/io/readers/epub_reader.py
@@ -549,9 +549,10 @@ class EPUBReader:
                 default_font = Font()
                 error_para.add_word(
                     Word(
-                        f"Error loading chapter: {
-                            str(e)}",
-                        default_font))
+                        f"Error loading chapter: {str(e)}",
+                        default_font
+                    )
+                )
                 chapter.add_block(error_para)
                 # Still add PageBreak even after error
                 chapter.add_block(PageBreak())
diff --git a/pyWebLayout/style/fonts.py b/pyWebLayout/style/fonts.py
index 97e682f..90748da 100644
--- a/pyWebLayout/style/fonts.py
+++ b/pyWebLayout/style/fonts.py
@@ -110,8 +110,8 @@ class Font:
                     logger.info(f"Loading bundled font from: {bundled_font_path}")
                     self._font = ImageFont.truetype(bundled_font_path, self._font_size)
                     logger.info(
-                        f"Successfully loaded bundled font at size {
-                            self._font_size}")
+                        f"Successfully loaded bundled font at size {self._font_size}"
+                    )
                 else:
                     # Only fall back to PIL's default font if bundled font is not
                     # available
diff --git a/tests/io_tests/test_html_file_loader.py b/tests/io_tests/test_html_file_loader.py
index 4515acd..de0e18e 100644
--- a/tests/io_tests/test_html_file_loader.py
+++ b/tests/io_tests/test_html_file_loader.py
@@ -78,8 +78,8 @@ class TestHTMLFileLoader(unittest.TestCase):
         self.assertGreater(len(blocks), 0, "Should extract blocks with custom font")
 
         print(
-            f"Successfully parsed HTML file with custom font, got {
-                len(blocks)} blocks")
+            f"Successfully parsed HTML file with custom font, got {len(blocks)} blocks"
+        )
 
     def test_load_html_file_content_types(self):
         """Test that the loaded HTML file contains expected content types."""