diff --git a/docs/environment.yml b/docs/environment.yml
index a94d3d362..e2fe5a8c8 100644
--- a/docs/environment.yml
+++ b/docs/environment.yml
@@ -14,6 +14,7 @@ dependencies:
   - ipywidgets=7.4.2
   - jupyter_sphinx=0.2.2
   - atomicwrites=1.3.0
+  - pyviz_comms=0.7.2
   - pip:
     - sphinx_fontawesome==0.0.6
     - m2r==0.2.1