diff --git a/requirements.txt b/requirements.txt
index f8f613626..a99abde65 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,6 @@ rst2pdf
 pillow
 sphinx-rtd-theme==1.2.0rc2
 sphinxcontrib-phpdomain
+
+# https://github.com/readthedocs/readthedocs.org/issues/9037#issuecomment-1077818554
+jinja2<3.1.0