diff --git a/tox.ini b/tox.ini
index 03241132f..7232ecef7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -64,6 +64,7 @@ commands =
     docs: make html
     livedocs: make livehtml
 deps =
+    Jinja2<3.1
     sphinx<3
     oauthlib>=3.1.0
     m2r>=0.2.1