diff --git a/docs/pyproject.toml b/docs/pyproject.toml
index e7e9ed9eeb6..8b427c5ab1f 100644
--- a/docs/pyproject.toml
+++ b/docs/pyproject.toml
@@ -9,7 +9,7 @@ module-root = ""
 name = "smithy"
 version = "1.0.0"
 dependencies = [
-    "sphinx==8.2.3",
+    "sphinx==9.0.1",
     "pygments==2.19.2",
     "furo==2025.9.25",