diff --git a/docs/_klipper3d/mkdocs-requirements.txt b/docs/_klipper3d/mkdocs-requirements.txt
index 1b8315ec..cbc625a3 100644
--- a/docs/_klipper3d/mkdocs-requirements.txt
+++ b/docs/_klipper3d/mkdocs-requirements.txt
@@ -1,4 +1,5 @@
 # Python virtualenv module requirements for mkdocs
+jinja2==3.0.3
 mkdocs==1.2.3
 mkdocs-material==8.1.3
 mkdocs-simple-hooks==0.1.3