diff --git a/pyproject.toml b/pyproject.toml
index 35f2fb22..0708c837 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,7 +15,7 @@ readme = "README.md"
 requires-python = ">=3.8"
 dependencies = [
   "beautifulsoup4",
-  "sphinx >= 6.0,<8.0",
+  "sphinx >= 6.0,<9.0",
   "sphinx-basic-ng >= 1.0.0.beta2",
   "pygments >= 2.7",
 ]