diff --git a/plugins/yjs/fps_yjs/ywidgets/widgets.py b/plugins/yjs/fps_yjs/ywidgets/widgets.py
index 4da5e247..2b03eb32 100644
--- a/plugins/yjs/fps_yjs/ywidgets/widgets.py
+++ b/plugins/yjs/fps_yjs/ywidgets/widgets.py
@@ -24,7 +24,7 @@ def comm_open(self, msg, comm) -> None:
         name = msg["metadata"]["ymodel_name"]
         comm_id = msg["content"]["comm_id"]
         self.comm = comm
-        model = self.ydocs[name](primary=False)
+        model = self.ydocs[f"{name}Model"]()
         self.widgets[comm_id] = {"model": model, "comm": comm}
         msg = sync(model.ydoc)
         comm.send(**msg)
diff --git a/plugins/yjs/pyproject.toml b/plugins/yjs/pyproject.toml
index d395ae81..a4609a26 100644
--- a/plugins/yjs/pyproject.toml
+++ b/plugins/yjs/pyproject.toml
@@ -8,7 +8,7 @@ description = "An FPS plugin for the Yjs API"
 keywords = [ "jupyter", "server", "fastapi", "plugins" ]
 requires-python = ">=3.8"
 dependencies = [
-    "pycrdt >=0.3.4,<0.4.0",
+    "pycrdt >=0.4.1,<0.5.0",
     "jupyverse-api >=0.1.2,<1",
 ]
 dynamic = [ "version",]
diff --git a/pyproject.toml b/pyproject.toml
index 5be881b1..0c84f4c3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,8 +54,8 @@ test = [
     "requests",
     "websockets",
     "ipykernel",
-    "ypywidgets >=0.5.0,<0.6.0",
-    "ypywidgets-textual",
+    "ypywidgets >=0.6.1,<0.7.0",
+    "ypywidgets-textual >=0.2.1,<0.3.0",
 ]
 docs = [ "mkdocs", "mkdocs-material" ]