diff --git a/app/logical/user_promotion.rb b/app/logical/user_promotion.rb
index 457c67cce..e9653bb2d 100644
--- a/app/logical/user_promotion.rb
+++ b/app/logical/user_promotion.rb
@@ -54,6 +54,8 @@ class UserPromotion
       raise User::PrivilegeError, "You can't promote other users to your rank or above"
     elsif user.level >= promoter.level
       raise User::PrivilegeError, "You can't promote or demote other users at your rank or above"
+    elsif is_upgrade && user.is_builder?
+      raise User::PrivilegeError, "You can't upgrade a user that is above Platinum level"
     end
   end
 
diff --git a/test/functional/user_upgrades_controller_test.rb b/test/functional/user_upgrades_controller_test.rb
index 8fbd64d34..db88aa327 100644
--- a/test/functional/user_upgrades_controller_test.rb
+++ b/test/functional/user_upgrades_controller_test.rb
@@ -77,6 +77,16 @@ class UserUpgradesControllerTest < ActionDispatch::IntegrationTest
         end
       end
 
+      context "an upgrade for a user above Platinum level" do
+        should "not demote the user" do
+          @builder = create(:builder_user)
+          post_auth user_upgrade_path, @user, params: { stripeToken: @token, desc: "Upgrade to Gold", user_id: @builder.id }
+
+          assert_response 403
+          assert_equal(true, @builder.reload.is_builder?)
+        end
+      end
+
       context "an upgrade with a missing Stripe token" do
         should "not upgrade the user" do
           post_auth user_upgrade_path, @user, params: { desc: "Upgrade to Gold" }