diff --git a/db/migrate/006_create_roles.rb b/db/migrate/006_create_roles.rb
--- a/db/migrate/006_create_roles.rb
+++ b/db/migrate/006_create_roles.rb
@@ -1,10 +1,10 @@
-class CreateRoles < ActiveRecord::Migration
+class CreateRoles < ActiveRecord::Migration[4.2]
   def self.up
-    create_table :roles do |t|
+    create_table :roles, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci" do |t|
       t.column 'name', :string
     end
 
-    create_table :roles_users, :id => false do |t|
+    create_table :roles_users, :id => false, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci" do |t|
       t.column 'role_id', :integer
       t.column 'user_id', :integer
     end