diff --git a/pyproject.toml b/pyproject.toml
index 96763e3..64232e7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,7 @@ dev-dependencies = [
   "pytest",
   "pytest-mock",
   "responses",
-  "sphinx~=5.3.0",
+  "sphinx~=9.0.4",
   "sphinx-autobuild",
   "sphinx-argparse",
   "sphinx-book-theme",