diff --git a/docs/environment.yml b/docs/environment.yml
index 8810381..9fac6ef 100644
--- a/docs/environment.yml
+++ b/docs/environment.yml
@@ -14,4 +14,5 @@ dependencies:
   - sphinx-autobuild
   - sphinx>=1.4
   - pip:
+    - nansat
     - nbsphinx