diff --git a/pyproject.toml b/pyproject.toml
index 1f9440f9..5bf33357 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -87,7 +87,7 @@ testing-docutils = [
 mypy = [
     "mypy==1.19.1",
     "types-urllib3",
-    "sphinx~=8.2",
+    "sphinx~=9.0",
     "markdown-it-py~=4.0",
     "mdit-py-plugins~=0.5.0",
 ]