diff --git a/package.json b/package.json
index 9f36767c..2bd9a415 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@vaadin/vaadin-date-picker",
-  "version": "4.1.0-alpha2",
+  "version": "4.2.0-alpha1",
   "description": "Polymer element providing a date selection field with scrollable month calendar",
   "main": "vaadin-date-picker.html",
   "repository": "vaadin/vaadin-date-picker",
diff --git a/src/vaadin-date-picker.html b/src/vaadin-date-picker.html
index 4ad84d31..e74fc125 100644
--- a/src/vaadin-date-picker.html
+++ b/src/vaadin-date-picker.html
@@ -188,7 +188,7 @@
         }
 
         static get version() {
-          return '4.1.0-alpha2';
+          return '4.2.0-alpha1';
         }
 
         static get properties() {