diff --git a/core/lib/generators/solidus/install/app_templates/frontend/starter.rb b/core/lib/generators/solidus/install/app_templates/frontend/starter.rb
index ad3d61562e0..7a6c7ee377d 100644
--- a/core/lib/generators/solidus/install/app_templates/frontend/starter.rb
+++ b/core/lib/generators/solidus/install/app_templates/frontend/starter.rb
@@ -1 +1 @@
-apply 'https://github.com/solidusio/solidus_starter_frontend/raw/v3.0/template.rb'
+apply 'https://github.com/solidusio/solidus_starter_frontend/raw/main/template.rb'
diff --git a/core/lib/spree/core/version.rb b/core/lib/spree/core/version.rb
index c1a5610c817..b6dc6f794be 100644
--- a/core/lib/spree/core/version.rb
+++ b/core/lib/spree/core/version.rb
@@ -1,14 +1,14 @@
 # frozen_string_literal: true
 
 module Spree
-  VERSION = "3.0.0"
+  VERSION = "4.0.0.dev"
 
   def self.solidus_version
     VERSION
   end
 
   def self.previous_solidus_minor_version
-    '3.4'
+    '3.0'
   end
 
   def self.solidus_gem_version
diff --git a/docker-compose.yml b/docker-compose.yml
index a41e7fd1c32..252b4570ce0 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -27,7 +27,7 @@ services:
         NODE_VERSION: 14
         MYSQL_VERSION: "8.0"
         BUNDLER_VERSION: 2
-    image: solidus-3.0.0
+    image: solidus-4.0.0.dev
     command: bash -c "(bundle check || bundle) && bash -c 'echo Container initialized, see README.md for further steps.' && tail -f /dev/null"
     environment:
       CAPYBARA_DRIVER: selenium_chrome_headless_docker_friendly