diff --git a/pyproject.toml b/pyproject.toml
index 0c73983..eebcbf7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ classifiers = [
 ]
 
 dependencies = [
-    "sphinx>=7.2.6,<9",
+    "sphinx>=9.0.4,<10",
 ]
 
 [project.optional-dependencies]