pin jinja2 (#5303)

keewis · web-flow · commit 3e12ff73c17f · 2021-05-13T19:04:21.000-06:00
diff --git a/ci/requirements/doc.yml b/ci/requirements/doc.yml
@@ -13,6 +13,7 @@ dependencies:
   - ipykernel
   - ipython
   - iris>=2.3
+  - jinja2<3.0  # jinja=3.0 is incompatible with nbsphinx
   - jupyter_client
   - matplotlib-base
   - nbsphinx
