diff --git a/docs/environment.yml b/docs/environment.yml
index 1965ab5e57..f1dde1846b 100644
--- a/docs/environment.yml
+++ b/docs/environment.yml
@@ -10,3 +10,4 @@ dependencies:
 - pip:
   - sphinx<1.4
   - nbsphinx
+  - Send2Trash