diff --git a/lib/package.json b/lib/package.json
index 544c3c5a6..c8c4918f1 100644
--- a/lib/package.json
+++ b/lib/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@material-ui/pickers",
-  "version": "3.2.8",
+  "version": "4.0.0-alpha.1",
   "private": true,
   "description": "React components, that implements material design pickers for material-ui v4",
   "main": "./src/index.ts",