diff --git a/requirements.txt b/requirements.txt
index 65004cc6..cb55b7bc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ bigfeta
 opencv-contrib-python
 em_stitch
 matplotlib
-jinja2
+jinja2<3.1
 six
 scikit-image
 shapely