diff --git a/pyproject.toml b/pyproject.toml
index 2bc2b526e8..593be36b75 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -78,7 +78,7 @@ gpu = [
     "cupy-cuda12x",
 ]
 docs = [
-    'sphinx==8.0.2',
+    'sphinx==8.1.3',
     'sphinx-autobuild>=2021.3.14',
     'sphinx-autoapi==3.3.2',
     'sphinx_design',