diff --git a/post_rss_to_ghost.py b/post_rss_to_ghost.py
index c9ac18a..653f329 100644
--- a/post_rss_to_ghost.py
+++ b/post_rss_to_ghost.py
@@ -9,7 +9,6 @@ import re
 import time
 from logging.handlers import RotatingFileHandler
 from typing import Optional, List
-
 import feedparser
 import requests
 import jwt
@@ -18,7 +17,7 @@ from urllib.parse import urlparse, parse_qs
 
 # ------------- YouTube helpers -------------
 
-def fetch_youtube_oembed_html(youtube_url: str, timeout: int = 10) -> str | None:
+def fetch_youtube_oembed_html(youtube_url: str, timeout: int = 10) -> Optional[str]:
     """
     Get YouTube oEmbed HTML exactly as provided and wrap it as a Ghost embed card.
     """