diff --git a/package.json b/package.json
index ce777dd5..c45fda13 100644
--- a/package.json
+++ b/package.json
@@ -55,7 +55,7 @@
   },
   "dependencies": {
     "@deathbeds/jupyterlab-rjsf": "^1.1.0",
-    "@jupyter-notebook/ydoc": "^0.2.0",
+    "@jupyter/ydoc": "^0.2.0",
     "@jupyterlab/application": "^4.0.0-alpha.16",
     "@jupyterlab/apputils": "^4.0.0-alpha.16",
     "@jupyterlab/collaboration": "^4.0.0-alpha.16",
diff --git a/src/mainview.tsx b/src/mainview.tsx
index 39f63230..0af8425c 100644
--- a/src/mainview.tsx
+++ b/src/mainview.tsx
@@ -32,7 +32,7 @@ import {
 
 import { ContextMenu } from '@lumino/widgets';
 import { CommandRegistry } from '@lumino/commands';
-import { MapChange } from '@jupyter-notebook/ydoc';
+import { MapChange } from '@jupyter/ydoc';
 import { Annotation } from './annotation/view';
 import { AnnotationModel } from './annotation/model';
 
diff --git a/src/model.ts b/src/model.ts
index ef96276f..f280f6b2 100644
--- a/src/model.ts
+++ b/src/model.ts
@@ -1,6 +1,6 @@
 import { IChangedArgs } from '@jupyterlab/coreutils';
 import { IModelDB, ModelDB } from '@jupyterlab/observables';
-import { MapChange, YDocument } from '@jupyter-notebook/ydoc';
+import { MapChange, YDocument } from '@jupyter/ydoc';
 import { PartialJSONObject } from '@lumino/coreutils';
 import { ISignal, Signal } from '@lumino/signaling';
 import Ajv from 'ajv';
@@ -241,18 +241,17 @@ export class JupyterCadDoc
 
     this._options = this.ydoc.getMap<any>('options');
     this._objects = this.ydoc.getArray<IJCadObjectDoc>('objects');
+    this._metadata = this.ydoc.getMap<string>('metadata');
 
     this.undoManager.addToScope(this._objects);
 
-    this._objects.observe(this._objectsObserver);
-
-    this._metadata = this.ydoc.getMap<string>('metadata');
+    this._objects.observeDeep(this._objectsObserver);
     this._metadata.observe(this._metaObserver);
   }
 
   dispose(): void {
-    // this._objects.unobserve(this._objectsObserver);
-    // this._options.unobserve(this._optionsObserver);
+    this._objects.unobserveDeep(this._objectsObserver);
+    this._metadata.unobserve(this._metaObserver);
   }
 
   get objects(): Y.Array<IJCadObjectDoc> {
@@ -352,27 +351,14 @@ export class JupyterCadDoc
     return new JupyterCadDoc();
   }
 
-  private _objectsObserver = (event: Y.YArrayEvent<IJCadObjectDoc>): void => {
-    event.changes.added.forEach(item => {
-      const type = (item.content as Y.ContentType).type as Y.Map<any>;
-      type.observe(this.emitChange);
-    });
-    event.changes.deleted.forEach(item => {
-      const type = (item.content as Y.ContentType).type as Y.Map<any>;
-      type.unobserve(this.emitChange);
-    });
-    const objectChange = [];
-    this._changed.emit({ objectChange });
+  private _objectsObserver = (event: Y.YEvent<any>[]): void => {
+    this._changed.emit({ objectChange: [] });
   };
 
   private _metaObserver = (event: Y.YMapEvent<string>): void => {
     this._metadataChanged.emit(event.keys);
   };
 
-  private emitChange = () => {
-    this._changed.emit({});
-  };
-
   private _objects: Y.Array<IJCadObjectDoc>;
   private _options: Y.Map<any>;
   private _metadata: Y.Map<string>;
diff --git a/src/types.ts b/src/types.ts
index 9dfd8cf6..0cf421ba 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,7 +1,7 @@
 import { IJCadObject } from './_interface/jcad.d';
 import { IChangedArgs } from '@jupyterlab/coreutils';
 import { DocumentRegistry, IDocumentWidget } from '@jupyterlab/docregistry';
-import { MapChange, YDocument, StateChange } from '@jupyter-notebook/ydoc';
+import { MapChange, YDocument, StateChange } from '@jupyter/ydoc';
 import { ReactWidget } from '@jupyterlab/ui-components';
 import { User } from '@jupyterlab/services';
 import { ISignal, Signal } from '@lumino/signaling';
diff --git a/yarn.lock b/yarn.lock
index 0e011932..15c5316b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -529,7 +529,7 @@
   resolved "https://registry.yarnpkg.com/@juggle/resize-observer/-/resize-observer-3.4.0.tgz#08d6c5e20cf7e4cc02fd181c4b0c225cd31dbb60"
   integrity sha512-dfLbk+PwWvFzSxwk3n5ySL0hfBog779o8h68wK/7/APo/7cgyWp5jcXockbxdk5kFRkbeXWm4Fbi9FrdN381sA==
 
-"@jupyter-notebook/ydoc@^0.2.0", "@jupyter-notebook/ydoc@~0.2.0":
+"@jupyter-notebook/ydoc@~0.2.0":
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/@jupyter-notebook/ydoc/-/ydoc-0.2.0.tgz#0febf91cd80dd2206f668c60e8ee20f4983cca99"
   integrity sha512-R8iHKwU+8OvdYwtgNj9dh3vv0OrAyHLNDmXjaSu6CJ1w10OP7MuQasvD18DAgTjqlHEUgnPoSJA2j0UlflSC1Q==
@@ -541,6 +541,18 @@
     y-protocols "^1.0.5"
     yjs "^13.5.40"
 
+"@jupyter/ydoc@^0.2.0":
+  version "0.2.2"
+  resolved "https://registry.yarnpkg.com/@jupyter/ydoc/-/ydoc-0.2.2.tgz#a2be83d2a0e076cef7ed77302e69153a0a4d6c16"
+  integrity sha512-UtU7ZxpL0k+QF9So4wtGxaS2C+nno58dig7sQUaBn48wlQDiuypzKgUmF7I37srpu6f/ywon3JBuEjxuL1CIBQ==
+  dependencies:
+    "@jupyterlab/nbformat" "^3.0.0 || ^4.0.0-alpha.15"
+    "@lumino/coreutils" "^1.11.0 || ^2.0.0-alpha.6"
+    "@lumino/disposable" "^1.10.0 || ^2.0.0-alpha.6"
+    "@lumino/signaling" "^1.10.0 || ^2.0.0-alpha.6"
+    y-protocols "^1.0.5"
+    yjs "^13.5.40"
+
 "@jupyterlab/application@^4.0.0-alpha.16":
   version "4.0.0-alpha.16"
   resolved "https://registry.yarnpkg.com/@jupyterlab/application/-/application-4.0.0-alpha.16.tgz#737f5875115fecddcd5b2b2f45114b35390b09f7"