diff --git a/db/migrate/20140202020201_create_searches.rb b/db/migrate/20140202020201_create_searches.rb
index e581ead787..1813fc7c15 100644
--- a/db/migrate/20140202020201_create_searches.rb
+++ b/db/migrate/20140202020201_create_searches.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
-class CreateSearches < ActiveRecord::Migration
+class CreateSearches < ActiveRecord::Migration[4.2]
   def self.up
     create_table :searches do |t|
       t.binary  :query_params
diff --git a/db/migrate/20140202020202_create_bookmarks.rb b/db/migrate/20140202020202_create_bookmarks.rb
index 69f453ec27..0f421c96d1 100644
--- a/db/migrate/20140202020202_create_bookmarks.rb
+++ b/db/migrate/20140202020202_create_bookmarks.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
-class CreateBookmarks < ActiveRecord::Migration
+class CreateBookmarks < ActiveRecord::Migration[4.2]
   def self.up
     create_table :bookmarks do |t|
       t.integer :user_id, index: true, null: false
diff --git a/db/migrate/20140320000000_add_polymorphic_type_to_bookmarks.rb b/db/migrate/20140320000000_add_polymorphic_type_to_bookmarks.rb
index 6eec1a1911..da663e90ea 100644
--- a/db/migrate/20140320000000_add_polymorphic_type_to_bookmarks.rb
+++ b/db/migrate/20140320000000_add_polymorphic_type_to_bookmarks.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
-class AddPolymorphicTypeToBookmarks < ActiveRecord::Migration
+class AddPolymorphicTypeToBookmarks < ActiveRecord::Migration[4.2]
   def change
     add_column(:bookmarks, :document_type, :string) unless Bookmark.connection.column_exists? :bookmarks, :document_type