diff --git a/setup.py b/setup.py
index 63f75a93..695b152f 100644
--- a/setup.py
+++ b/setup.py
@@ -72,7 +72,7 @@ def read(path):
               'pueblo>=0.0.7',
               'pytz',
               ],
-        doc=['sphinx>=3.5,<8',
+        doc=['sphinx>=3.5,<9',
              'crate-docs-theme>=0.26.5'],
     ),
     python_requires='>=3.6',