diff --git a/db/migrate/022_create_configurations.rb b/db/migrate/022_create_configurations.rb
--- a/db/migrate/022_create_configurations.rb
+++ b/db/migrate/022_create_configurations.rb
@@ -1,6 +1,6 @@
-class CreateConfigurations < ActiveRecord::Migration
+class CreateConfigurations < ActiveRecord::Migration[4.2]
   def self.up
-    create_table :configurations do |t|
+    create_table :configurations, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci" do |t|
       t.column :key, :string
       t.column :value_type, :string
       t.column :value, :string