diff --git a/lib/react_on_rails/version.rb b/lib/react_on_rails/version.rb
index ced429c95..64f8c40a1 100644
--- a/lib/react_on_rails/version.rb
+++ b/lib/react_on_rails/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module ReactOnRails
-  VERSION = "14.0.5"
+  VERSION = "15.0.0.alpha.0"
 end
diff --git a/package.json b/package.json
index cd4b64a96..1d52a9df5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-on-rails",
-  "version": "14.0.5",
+  "version": "15.0.0-alpha.0",
   "description": "react-on-rails JavaScript for react_on_rails Ruby gem",
   "main": "node_package/lib/ReactOnRails.js",
   "directories": {
diff --git a/spec/dummy/Gemfile.lock b/spec/dummy/Gemfile.lock
index fb58905c9..4ac822d96 100644
--- a/spec/dummy/Gemfile.lock
+++ b/spec/dummy/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ../..
   specs:
-    react_on_rails (14.0.5)
+    react_on_rails (15.0.0.alpha.0)
       addressable
       connection_pool
       execjs (~> 2.5)