diff --git a/docs/requirements.txt b/docs/requirements.txt
index 7103ab880..be7ac12da 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,4 @@
+Jinja2<3.1
 recommonmark==0.7.*
 sphinx-markdown-tables==0.0.15
 sphinx-rtd-theme==0.5.*