diff --git a/pyproject.toml b/pyproject.toml
index 9f26bd50e..8c337cf49 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -68,7 +68,7 @@ test = [
 docs = [
     # needed because m2r uses deprecated APIs
     # m2r is depended on by sphinxcontrib-openapi
-    "docutils<0.20",
+    "docutils<0.21",
     "ipykernel",
     "jinja2",
     "jupyter_client",