diff --git a/pyproject.toml b/pyproject.toml
index f8552bf3..43c93758 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -71,7 +71,7 @@ changelog = [
 ]
 docs = [
     "pydata-sphinx-theme>=0.17.1",
-    "sphinx>=8.2.3",
+    "sphinx>=9.1.0",
     "sphinx-autoapi>=3.8.0",
     "sphinx-autodoc-typehints>=3.10.2",
     "sphinx-click>=6.0.0",