diff --git a/environments/access-med/environment.yml b/environments/access-med/environment.yml
index c938c4f..acfd938 100644
--- a/environments/access-med/environment.yml
+++ b/environments/access-med/environment.yml
@@ -71,6 +71,7 @@ dependencies:
 - ipywidgets
 - astropy
 - tqdm
+- moderngl
 - pip:
   - lavavu
   - railroad-diagrams ### Unlisted dependency of pip and pyparsing