diff --git a/requirements-docs.txt b/requirements-docs.txt
index 372ffe2..7ebe114 100644
--- a/requirements-docs.txt
+++ b/requirements-docs.txt
@@ -1,2 +1,2 @@
-mkdocs>=1.6
-mkdocs-material>=9.5
+mkdocs>=1.6,<2.0
+mkdocs-material>=9.5,<10.0