diff --git a/docs/pyproject.toml b/docs/pyproject.toml
index 8ae976f..4dd27d5 100644
--- a/docs/pyproject.toml
+++ b/docs/pyproject.toml
@@ -8,7 +8,7 @@ package-mode = false
 
 [tool.poetry.dependencies]
 python = "^3.12"
-sphinx = "8.2.3"
+sphinx = "9.0.4"
 sphinx-autobuild = "2025.8.25"
 sphinxext-opengraph = "0.13.0"
 sphinxcontrib-httpdomain = "1.8.1"