diff --git a/app/controllers/api/v1/saved_scenarios_controller.rb b/app/controllers/api/v1/saved_scenarios_controller.rb
index 580ef48..16710f6 100644
--- a/app/controllers/api/v1/saved_scenarios_controller.rb
+++ b/app/controllers/api/v1/saved_scenarios_controller.rb
@@ -38,7 +38,7 @@ def update
         result = SavedScenario::Update.call(
           engine_client,
           @saved_scenario,
-          saved_scenario_params
+          saved_scenario_params.except(:version)
         )
 
         if result.successful?
@@ -62,7 +62,7 @@ def destroy
       # Only allow a list of trusted parameters through.
       def saved_scenario_params
         params.require(:saved_scenario).permit(
-          :scenario_id, :title,
+          :scenario_id, :title, :version,
           :description, :area_code, :end_year, :private, :discarded
         )
       end
diff --git a/app/controllers/api/v1/versions_controller.rb b/app/controllers/api/v1/versions_controller.rb
index 8623ac6..dad499c 100644
--- a/app/controllers/api/v1/versions_controller.rb
+++ b/app/controllers/api/v1/versions_controller.rb
@@ -1,29 +1,11 @@
 module Api
   module V1
     class VersionsController < BaseController
+      skip_before_action :authenticate_request!
 
       def index
-        versions = Version.all
-        base_url = request.base_url
-
-        version_data = versions.map do |version|
-          {
-            version: version,
-            url: version_url(version, base_url)
-          }
-        end
-
-        render json: { versions: version_data }, status: :ok
+        render json: { versions: Version.as_json }, status: :ok
       end
-
-      private
-
-      # Generates a version URL given a version name and the base URL
-      def version_url(version, base_url)
-        "https://#{version}.#{base_url}"
-      end
-
-
     end
   end
 end
diff --git a/app/models/saved_scenario.rb b/app/models/saved_scenario.rb
index a775be5..75a11b2 100644
--- a/app/models/saved_scenario.rb
+++ b/app/models/saved_scenario.rb
@@ -27,7 +27,7 @@ class SavedScenario < ApplicationRecord
   validates :end_year,    presence: true
   validates :area_code,   presence: true
   validates :version, presence: true, inclusion: {
-    in: Version.all, message: "Version should be one of #{Version.all}"
+    in: Version.tags, message: "Version should be one of #{Version.tags}"
   }
 
   serialize :scenario_id_history, coder: YAML, type: Array
diff --git a/app/models/version.rb b/app/models/version.rb
index 80ae200..9ddafda 100644
--- a/app/models/version.rb
+++ b/app/models/version.rb
@@ -2,13 +2,25 @@
 
 # A valid version of the ETM
 class Version
-  LIST = %w[
-    latest
-  ].freeze
+  URL = "energytransitionmodel.com".freeze
+
+  LIST = {
+    "latest" => "https://#{Version::URL}",
+    "stable.01" => "https://stable.#{Version::URL}",
+    "stable.02" => "https://stable2.#{Version::URL}"
+  }.freeze
 
   # All available versions. Uses ActiveRecord syntax 'all' to
   # make future porting to db easier
   def self.all
     LIST
   end
+
+  def self.tags
+    LIST.keys
+  end
+
+  def self.as_json(*)
+    LIST.map { |tag, url| { tag: tag, url: url } }
+  end
 end
diff --git a/spec/controllers/api/v1/versions_controller_spec.rb b/spec/controllers/api/v1/versions_controller_spec.rb
index 426472e..2080768 100644
--- a/spec/controllers/api/v1/versions_controller_spec.rb
+++ b/spec/controllers/api/v1/versions_controller_spec.rb
@@ -18,9 +18,8 @@
       parsed_response = JSON.parse(response.body)
 
       expect(parsed_response['versions']).to be_present
-      expect(parsed_response['versions'].map { |v| v['version'] }).to match_array(Version.all)
+      expect(parsed_response['versions'].map { |v| v['tag'] }).to match_array(Version.tags)
       expect(parsed_response['versions'].first).to have_key('url')
-      puts parsed_response
     end
   end
 end