diff --git a/docs/source/configuration.md b/docs/source/configuration.md
index bfe0b144..6cb1f65c 100644
--- a/docs/source/configuration.md
+++ b/docs/source/configuration.md
@@ -27,5 +27,5 @@ jupyter lab --YDocExtension.file_poll_interval=2
 jupyter lab --YDocExtension.document_cleanup_delay=100
 
 # The YStore class to use for storing Y updates (default: JupyterSQLiteYStore).
-jupyter lab --YDocExtension.ystore_class=ypy_websocket.ystore.TempFileYStore
+jupyter lab --YDocExtension.ystore_class=pycrdt_websocket.ystore.TempFileYStore
 ```
diff --git a/jupyter_collaboration/app.py b/jupyter_collaboration/app.py
index ff337460..c249d544 100644
--- a/jupyter_collaboration/app.py
+++ b/jupyter_collaboration/app.py
@@ -6,7 +6,7 @@
 
 from jupyter_server.extension.application import ExtensionApp
 from traitlets import Bool, Float, Type
-from ypy_websocket.ystore import BaseYStore
+from pycrdt_websocket.ystore import BaseYStore
 
 from .handlers import DocSessionHandler, YDocWebSocketHandler
 from .loaders import FileLoaderMapping
diff --git a/jupyter_collaboration/handlers.py b/jupyter_collaboration/handlers.py
index 4f000041..9902be4e 100644
--- a/jupyter_collaboration/handlers.py
+++ b/jupyter_collaboration/handlers.py
@@ -14,9 +14,9 @@
 from jupyter_ydoc import ydocs as YDOCS
 from tornado import web
 from tornado.websocket import WebSocketHandler
-from ypy_websocket.websocket_server import YRoom
-from ypy_websocket.ystore import BaseYStore
-from ypy_websocket.yutils 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 .loaders import FileLoaderMapping
 from .rooms import DocumentRoom, TransientRoom
diff --git a/jupyter_collaboration/rooms.py b/jupyter_collaboration/rooms.py
index 75e2a20e..543d664e 100644
--- a/jupyter_collaboration/rooms.py
+++ b/jupyter_collaboration/rooms.py
@@ -10,9 +10,9 @@
 
 from jupyter_events import EventLogger
 from jupyter_ydoc import ydocs as YDOCS
-from ypy_websocket.websocket_server import YRoom
-from ypy_websocket.ystore import BaseYStore, YDocNotFound
-from ypy_websocket.yutils import write_var_uint
+from pycrdt_websocket.websocket_server import YRoom
+from pycrdt_websocket.ystore import BaseYStore, YDocNotFound
+from pycrdt_websocket.yutils import write_var_uint
 
 from .loaders import FileLoader
 from .utils import (
diff --git a/jupyter_collaboration/stores.py b/jupyter_collaboration/stores.py
index 323e06ed..60c8df4a 100644
--- a/jupyter_collaboration/stores.py
+++ b/jupyter_collaboration/stores.py
@@ -3,8 +3,8 @@
 
 from traitlets import Int, Unicode
 from traitlets.config import LoggingConfigurable
-from ypy_websocket.ystore import SQLiteYStore as _SQLiteYStore
-from ypy_websocket.ystore import TempFileYStore as _TempFileYStore
+from pycrdt_websocket.ystore import SQLiteYStore as _SQLiteYStore
+from pycrdt_websocket.ystore import TempFileYStore as _TempFileYStore
 
 
 class TempFileYStore(_TempFileYStore):
diff --git a/jupyter_collaboration/websocketserver.py b/jupyter_collaboration/websocketserver.py
index f35c1148..cfcaf2f5 100644
--- a/jupyter_collaboration/websocketserver.py
+++ b/jupyter_collaboration/websocketserver.py
@@ -8,8 +8,8 @@
 from typing import Any
 
 from tornado.websocket import WebSocketHandler
-from ypy_websocket.websocket_server import WebsocketServer, YRoom
-from ypy_websocket.ystore import BaseYStore
+from pycrdt_websocket.websocket_server import WebsocketServer, YRoom
+from pycrdt_websocket.ystore import BaseYStore
 
 
 class RoomNotFound(LookupError):
diff --git a/pyproject.toml b/pyproject.toml
index f501a189..4335d01f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ classifiers = [
 dependencies = [
     "jupyter_server>=2.0.0,<3.0.0",
     "jupyter_ydoc>=1.1.0a0,<2.0.0",
-    "ypy-websocket>=0.12.1,<0.13.0",
+    "pycrdt-websocket>=0.12.5,<0.13.0",
     "jupyter_events>=0.7.0",
     "jupyter_server_fileid>=0.7.0,<1",
     "jsonschema>=4.18.0"
diff --git a/tests/conftest.py b/tests/conftest.py
index 234dbb3c..c10d9105 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -11,7 +11,7 @@
 import pytest
 from jupyter_ydoc import YNotebook, YUnicode
 from websockets import connect
-from ypy_websocket import WebsocketProvider
+from pycrdt_websocket import WebsocketProvider
 
 from jupyter_collaboration.loaders import FileLoader
 from jupyter_collaboration.rooms import DocumentRoom
diff --git a/tests/test_handlers.py b/tests/test_handlers.py
index 0a8f7d08..dc6280c4 100644
--- a/tests/test_handlers.py
+++ b/tests/test_handlers.py
@@ -8,7 +8,7 @@
 from typing import Any
 
 from jupyter_ydoc import YUnicode
-from ypy_websocket import WebsocketProvider
+from pycrdt_websocket import WebsocketProvider
 
 
 async def test_session_handler_should_create_session_id(
diff --git a/tests/utils.py b/tests/utils.py
index 199e152c..c25e3f29 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -7,7 +7,7 @@
 from typing import Any
 
 from jupyter_server import _tz as tz
-from ypy_websocket.yutils import write_var_uint
+from pycrdt_websocket.yutils import write_var_uint
 
 from jupyter_collaboration.utils import RoomMessages