diff --git a/CHANGELOG.md b/CHANGELOG.md
index 78fd60b..906d453 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,8 @@
 - Diff: add `originalModelPath` and `modifiedModelPath` props, use them as model paths for original/modified models
 - ControlledEditor: remove; the `Editor` component, now, handles both controlled and uncontrolled modes
 - package.json: move `prop-types` to dependencies
+- types: fix types according to changed
+- Editor: add `onValidate` prop: an event emitted when the length of the model markers of the current model isn't 0
 
 ## 3.8.3
 ###### *Jan 8, 2021*
diff --git a/package.json b/package.json
index 19a093c..f6f9515 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@monaco-editor/react",
-  "version": "4.0.0-rc.0",
+  "version": "4.0.0-rc.1",
   "description": "Monaco editor wrapper for easy/one-line integration with React applications (e.g. powered by create-react-app) without need of webpack configuration files",
   "author": "Suren Atoyan <contact@surenatoyan.com>",
   "main": "lib/cjs/index.js",