diff --git a/requirements-mkdocs.txt b/requirements-mkdocs.txt
index 4f79605650..42c56a9a2e 100644
--- a/requirements-mkdocs.txt
+++ b/requirements-mkdocs.txt
@@ -1,3 +1,3 @@
-mkdocs==1.3.1
-mkdocs-material==8.5.1
-mkdocs-git-revision-date-localized-plugin==1.1.0
+mkdocs
+mkdocs-material>=8, <9
+mkdocs-git-revision-date-localized-plugin