diff --git a/environment.yml b/environment.yml
index b22db97f..298ea552 100644
--- a/environment.yml
+++ b/environment.yml
@@ -16,5 +16,4 @@ dependencies:
   - ujson>=1.35
   - aiofiles>=0.3.0
   - websockets>=3.2
-  - pyyaml>=3.12
   - https://github.com/channelcat/docutils-fork/zipball/master
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