diff --git a/src/sphinx_book_theme/__init__.py b/src/sphinx_book_theme/__init__.py
index b15c1033a..f38b8a80e 100644
--- a/src/sphinx_book_theme/__init__.py
+++ b/src/sphinx_book_theme/__init__.py
@@ -1,4 +1,5 @@
 """A lightweight book theme based on the pydata sphinx theme."""
+
 import hashlib
 import os
 from pathlib import Path
diff --git a/src/sphinx_book_theme/_compile_translations.py b/src/sphinx_book_theme/_compile_translations.py
index bee4422ba..395556c83 100644
--- a/src/sphinx_book_theme/_compile_translations.py
+++ b/src/sphinx_book_theme/_compile_translations.py
@@ -1,4 +1,5 @@
 """Generate compiled static translation assets for Sphinx."""
+
 import json
 import os
 from pathlib import Path
diff --git a/src/sphinx_book_theme/header_buttons/__init__.py b/src/sphinx_book_theme/header_buttons/__init__.py
index e18d51c03..6e61c8daf 100644
--- a/src/sphinx_book_theme/header_buttons/__init__.py
+++ b/src/sphinx_book_theme/header_buttons/__init__.py
@@ -1,4 +1,5 @@
 """Generate metadata for header buttons."""
+
 from sphinx.errors import SphinxError
 from sphinx.locale import get_translation
 from pydata_sphinx_theme.utils import config_provided_by_user, get_theme_options_dict
diff --git a/tests/sites/base/section1/ntbk.ipynb b/tests/sites/base/section1/ntbk.ipynb
index cebfdbb6f..39cad918e 100644
--- a/tests/sites/base/section1/ntbk.ipynb
+++ b/tests/sites/base/section1/ntbk.ipynb
@@ -21,7 +21,7 @@
     }
    ],
    "source": [
-    "print('hi')"
+    "print(\"hi\")"
    ]
   }
  ],