diff --git a/docs.py b/docs.py
index 0b0c4dd..51bf6de 100644
--- a/docs.py
+++ b/docs.py
@@ -1,5 +1,5 @@
 from dataclasses import dataclass
-from typing import Any
+from typing import Any, Optional
 import datetime
 import re
 import os
@@ -91,8 +91,8 @@ CONTENTS = {
 class Part:
     id: str
     name: str
-    description: str | None = None
-    page: str | None = None
+    description: Optional[str] = None
+    page: Optional[str] = None
 
 
 PARTS = {
diff --git a/requirements.txt b/requirements.txt
index 37a17c7..ffb03de 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 flask
 Frozen-Flask
 jinja_markdown
+libsass