db/migrate/20180430163647_utf8mb4_conversion.rb in iqvoc-4.12.1 vs db/migrate/20180430163647_utf8mb4_conversion.rb in iqvoc-4.13.0

@@ -1,5 +1,5 @@
-class Utf8mb4Conversion < ActiveRecord::Migration
+class Utf8mb4Conversion < ActiveRecord::Migration[4.2]
 
   def up
     if ActiveRecord::Base.connection.adapter_name == 'Mysql2'
       change_column :collection_members, :type, :string, limit: 191
       change_column :concept_relations, :type, :string, limit: 191