diff --git a/requirements-tests.txt b/requirements-tests.txt
index bc61d021..efe2ae85 100644
--- a/requirements-tests.txt
+++ b/requirements-tests.txt
@@ -4,3 +4,4 @@ sphinx==1.8.5
 sphinx-rtd-theme==0.4.3
 rst2html5
 flake8==4.0.1
+jinja2<3.1.0