diff --git a/pyproject.toml b/pyproject.toml
index b48b54b96..6129dead8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -83,7 +83,7 @@ dev = [
     "types-beautifulsoup4 >= 4.12.0,<5.0.0",
 ]
 docs = [
-    "sphinx >=8.0.0,<9.0.0",
+    "sphinx >=8.0.0,<10.0.0",
     "sphinx-autodoc-typehints >=3.0.0,<4.0.0",
     "sphinx-rtd-theme >=3.0.0,<4.0.0",
     "numpydoc >=1.5.0,<2.0.0",