diff --git a/environment.yml b/environment.yml
index 7eee43a5..298ea552 100644
--- a/environment.yml
+++ b/environment.yml
@@ -15,4 +15,5 @@ dependencies:
   - httptools>=0.0.9
   - ujson>=1.35
   - aiofiles>=0.3.0
+  - websockets>=3.2
   - https://github.com/channelcat/docutils-fork/zipball/master
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