diff --git a/setup.py b/setup.py
index e69284e8..087443e4 100644
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,7 @@ def _parse_requirements(path, encoding="utf-8"):
     install_requires=base_requirements,
     extras_require={
         "doc": [
-            "sphinx>=4.5.0,<8.0.0",
+            "sphinx>=4.5.0,<9.0.0",
             "sphinx_rtd_theme>=1.0,<1.5",
             "sphinx-markdown-tables~=0.0.15",
             "sphinx-click>=3.1,<5.2",