diff --git a/pyproject.toml b/pyproject.toml
index 25e18b8..4db0dc6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,7 +36,7 @@ dependencies = [
 ]
 [project.optional-dependencies]
 docs = [
-	"docutils==0.17.1",    # https://jupyterbook.org/en/stable/content/citations.html?highlight=docutils#citations-and-bibliographies
+	"docutils==0.21.2",    # https://jupyterbook.org/en/stable/content/citations.html?highlight=docutils#citations-and-bibliographies
 	"jupyter-book>=1,<2",
 	"sphinxcontrib-apidoc>=0.4.0,<1",
 ]