diff --git a/doc/requirements.txt b/doc/requirements.txt
index 39a222d..9f1aa97 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,2 +1,3 @@
 mkdocs==1.3.0
-Jinja2==2.10.2
+Jinja2>=2.10.2
+MarkupSafe>=2.0