diff --git a/pyproject.toml b/pyproject.toml
index ed1427a3c..b69da983d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,8 +11,9 @@ authors = []
 python = "^3.8"
 
 [tool.poetry.dev-dependencies]
+# These can be updated with `poetry add`.
 mkdocs = "^1.5.2"
-mkdocs-material = "^9.2.5"
+mkdocs-material = "^9.4"
 # (Py)Markdown extensions
 mdx-truly-sane-lists = "^1.3"
 mdx-breakless-lists = "^1.0.1"