diff --git a/docker/py/requirements.txt b/docker/py/requirements.txt
index c674ac17..00533f54 100644
--- a/docker/py/requirements.txt
+++ b/docker/py/requirements.txt
@@ -6,3 +6,4 @@ powerline-shell~=0.7.0
 requests>=2.20.0
 virtualenv>=20.7.2
 mistune>=2.0.1 # not directly required, pinned by Snyk to avoid a vulnerability
+Jinja2<3.1 # because of https://github.com/jupyter/nbconvert/issues/1742