diff --git a/Gemfile b/Gemfile
index 00c7cdb..34a474d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -21,7 +21,7 @@ when 'mysql'
 when 'postgresql'
   gem 'pg'
 else
-  gem 'sqlite3', '~> 1.7'
+  gem 'sqlite3', '~> 2.0'
 end
 
 gemspec
diff --git a/config/initializers/spree.rb b/config/initializers/spree.rb
index f4eb050..e6ea895 100644
--- a/config/initializers/spree.rb
+++ b/config/initializers/spree.rb
@@ -1,10 +1,12 @@
 Rails.application.config.to_prepare do
-  Spree::PermittedAttributes.product_attributes << :prototype_id
+  if Spree::PermittedAttributes.product_attributes.exclude?(:prototype_id)
+    Spree::PermittedAttributes.product_attributes << :prototype_id
+  end
   Spree::Backend::Config.configure do |config|
     product_tab = config.menu_items.detect { |menu_item|
       menu_item.label == :products
     }
-    if product_tab.respond_to?(:children)
+    if product_tab.respond_to?(:children) && product_tab.children.none? { |c| c.label == :prototypes }
       product_tab.children << Spree::BackendConfiguration::MenuItem.new(
         condition: -> { can?(:admin, Spree::Prototype) },
         url: :admin_prototypes_path,
@@ -12,7 +14,9 @@
         match_path: '/prototypes'
       )
     else
-      product_tab.sections << :prototypes
+      if product_tab.sections.exclude?(:prototypes)
+        product_tab.sections << :prototypes
+      end
     end
   end
 end