diff --git a/jupyter_collaboration/handlers.py b/jupyter_collaboration/handlers.py
index dcbfd6a8..233add4c 100644
--- a/jupyter_collaboration/handlers.py
+++ b/jupyter_collaboration/handlers.py
@@ -14,9 +14,9 @@
 from jupyter_server.base.handlers import APIHandler, JupyterHandler
 from jupyter_server.utils import ensure_async
 from jupyter_ydoc import ydocs as YDOCS
+from pycrdt import YMessageType, write_var_uint
 from pycrdt_websocket.websocket_server import YRoom
 from pycrdt_websocket.ystore import BaseYStore
-from pycrdt_websocket.yutils import YMessageType, write_var_uint
 from tornado import web
 from tornado.websocket import WebSocketHandler
 
diff --git a/pyproject.toml b/pyproject.toml
index 0898c0c8..7055fc0d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,8 @@ classifiers = [
 dependencies = [
     "jupyter_server>=2.0.0,<3.0.0",
     "jupyter_ydoc>=2.0.0,<3.0.0",
-    "pycrdt-websocket>=0.13.4,<0.14.0",
+    "pycrdt",
+    "pycrdt-websocket>=0.14.0,<0.15.0",
     "jupyter_events>=0.10.0",
     "jupyter_server_fileid>=0.7.0,<1",
     "jsonschema>=4.18.0"
@@ -143,6 +144,8 @@ filterwarnings = [
     "ignore:can't resolve package from __spec__ or __package__, falling back on __name__ and __path__:ImportWarning",
     # see https://github.com/dateutil/dateutil/issues/1314
     "ignore:.*datetime.utcfromtimestamp\\(\\) is deprecated.*:DeprecationWarning:",
+    # From anyio https://github.com/agronholm/anyio/pull/715
+    'ignore:Unclosed <MemoryObjectSendStream>:ResourceWarning',
 ]
 
 [tool.mypy]