diff --git a/docs/requirements.txt b/docs/requirements.txt
index 9c2625f..e6656f4 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -6,3 +6,4 @@ nbsphinx-link>=1.3.0
 pandoc>=1.1.0
 recommonmark==0.7.1
 ipython>=7.20.0
+jinja2<3.1