diff --git a/pyproject.toml b/pyproject.toml
index 5779bbe..4247e38 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -63,7 +63,7 @@ ipywidgets = "^8.0.3"
 pytest-xdist = "^3.6.1"
 
 [tool.poetry.group.docs.dependencies]
-Sphinx = "^8.0.0"
+Sphinx = "^9.0.0"
 pydata-sphinx-theme = "^0.17.0"
 myst-parser = "^4.0.0"
 jupyter = "^1.0.0"