diff --git a/environment.yml b/environment.yml
index 298ea552..1c1dd82f 100644
--- a/environment.yml
+++ b/environment.yml
@@ -16,4 +16,5 @@ dependencies:
   - ujson>=1.35
   - aiofiles>=0.3.0
   - websockets>=3.2
-  - https://github.com/channelcat/docutils-fork/zipball/master
\ No newline at end of file
+  - sphinxcontrib-asyncio>=0.2.0
+  - https://github.com/channelcat/docutils-fork/zipball/master