diff --git a/doc/environment.yml b/doc/environment.yml
index 09eab61c..47ce8828 100644
--- a/doc/environment.yml
+++ b/doc/environment.yml
@@ -7,6 +7,7 @@ dependencies:
   - freetype
   - graphviz
   - lxml
+  - netCDF4
   - numpy
   - numpydoc
   - pip