diff --git a/docs/environment.yml b/docs/environment.yml
index 46781c21..af255d33 100644
--- a/docs/environment.yml
+++ b/docs/environment.yml
@@ -44,4 +44,5 @@ dependencies:
     - toml>=0.10.2
     - urllib3>=1.26.6
     - xarray>=0.18.2
-    - nbsphinx
\ No newline at end of file
+    - nbsphinx
+    - dolfyn
\ No newline at end of file