diff --git a/pyproject.toml b/pyproject.toml
index 81dddcd..6cb8bf6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,7 +53,7 @@ data = [
     "pandas>=2.0",
 ]
 docs = [
-    "sphinx>=7.0",
+    "sphinx>=8.1.3",
     "sphinx-rtd-theme>=2.0",
     "numpydoc>=1.7",
 ]