diff --git a/pyproject.toml b/pyproject.toml
index 7fb8078f..2749b8c3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -78,7 +78,7 @@ test = [
 ]
 doc = [
     "mkdocs >=1.1.2,<2.0.0",
-    "mkdocs-material >=8.1.4,<9.0.0",
+    "mkdocs-material >=8.1.4,<10.0.0",
     "mdx-include >=1.4.1,<2.0.0",
     "mkdocs-markdownextradata-plugin >=0.1.7,<0.3.0",
     # TODO: upgrade and enable typer-cli once it supports Click 8.x.x