diff --git a/book_maker/loader/epub_loader.py b/book_maker/loader/epub_loader.py
index 1519d79..fc7fb53 100644
--- a/book_maker/loader/epub_loader.py
+++ b/book_maker/loader/epub_loader.py
@@ -14,8 +14,14 @@ from tqdm import tqdm
 from book_maker.utils import num_tokens_from_text, prompt_config_to_kwargs
 
 from .base_loader import BaseBookLoader
-from .helper import (EPUBBookLoaderHelper, is_text_figure, is_text_link,
-                     is_text_list, is_text_source, is_text_tail_link)
+from .helper import (
+    EPUBBookLoaderHelper,
+    is_text_figure,
+    is_text_link,
+    is_text_list,
+    is_text_source,
+    is_text_tail_link,
+)
 
 
 class EPUBBookLoader(BaseBookLoader):
diff --git a/book_maker/obok.py b/book_maker/obok.py
index 8ecd17d..dd4eeb9 100644
--- a/book_maker/obok.py
+++ b/book_maker/obok.py
@@ -199,8 +199,18 @@ class ENCRYPTIONError(Exception):
 
 
 def _load_crypto_libcrypto():
-    from ctypes import (CDLL, POINTER, Structure, c_char_p, c_int, c_long,
-                        c_ulong, c_void_p, cast, create_string_buffer)
+    from ctypes import (
+        CDLL,
+        POINTER,
+        Structure,
+        c_char_p,
+        c_int,
+        c_long,
+        c_ulong,
+        c_void_p,
+        cast,
+        create_string_buffer,
+    )
     from ctypes.util import find_library
 
     if sys.platform.startswith("win"):