--- pyproject.toml.orig	2020-02-02 00:00:00 UTC
+++ pyproject.toml
@@ -22,7 +22,7 @@ classifiers = [
 requires-python = ">=3.7"
 dependencies = [
   "jupyter_ydoc>=0.2.0,<0.4.0",
-  "ypy-websocket>=0.8.2,<0.9.0",
+  "ypy-websocket>=0.8.2,<=0.9.0",
   "jupyter_server_fileid >=0.6.0,<1"
 ]