diff --git a/workflow/envs/python.yaml b/workflow/envs/python.yaml
index d918d468..327c11b5 100644
--- a/workflow/envs/python.yaml
+++ b/workflow/envs/python.yaml
@@ -4,6 +4,8 @@ channels:
   - anaconda
   - nodefaults
 dependencies:
+  - python =3.9
+  - nbconvert =7.8
   - pandas =1.2
   - jupyter =1.0
   - altair =4.1