diff --git a/doc/environment.yml b/doc/environment.yml
index 5e38e9257..4d075a710 100644
--- a/doc/environment.yml
+++ b/doc/environment.yml
@@ -16,3 +16,4 @@ dependencies:
     - sphinxcontrib-bibtex
     - sphinxcontrib-programoutput
     - nbsphinx
+    - openpyxl