diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3061749..540ed45 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [Unreleased]
+### Fixed
+- Require `rails/generators` in custom generators to fix `uninitialized constant Generators::Base`
+
 ## [2.1.1] - 2017-02-11
 ### Fixed
 - Stop trying to retrieve user from empty payload when no token is given
diff --git a/lib/generators/knock/install_generator.rb b/lib/generators/knock/install_generator.rb
index cb68723..91e3cde 100644
--- a/lib/generators/knock/install_generator.rb
+++ b/lib/generators/knock/install_generator.rb
@@ -1,3 +1,5 @@
+require 'rails/generators'
+
 module Knock
   class InstallGenerator < Rails::Generators::Base
     source_root File.expand_path("../../templates", __FILE__)
diff --git a/lib/generators/knock/token_controller_generator.rb b/lib/generators/knock/token_controller_generator.rb
index 4feab90..369dad6 100644
--- a/lib/generators/knock/token_controller_generator.rb
+++ b/lib/generators/knock/token_controller_generator.rb
@@ -1,3 +1,5 @@
+require 'rails/generators'
+
 module Knock
   class TokenControllerGenerator < Rails::Generators::Base
     source_root File.expand_path("../../templates", __FILE__)
diff --git a/test/dummy/db/migrate/20150713101607_create_users.rb b/test/dummy/db/migrate/20150713101607_create_users.rb
index e2fdb6f..7c99889 100644
--- a/test/dummy/db/migrate/20150713101607_create_users.rb
+++ b/test/dummy/db/migrate/20150713101607_create_users.rb
@@ -1,4 +1,4 @@
-class CreateUsers < ActiveRecord::Migration
+class CreateUsers < ActiveRecord::Migration[4.2]
   def change
     create_table :users do |t|
       t.string :email, unique: true, null: false
diff --git a/test/dummy/db/migrate/20160519075733_create_admins.rb b/test/dummy/db/migrate/20160519075733_create_admins.rb
index 31bfd1a..9d72a80 100644
--- a/test/dummy/db/migrate/20160519075733_create_admins.rb
+++ b/test/dummy/db/migrate/20160519075733_create_admins.rb
@@ -1,4 +1,4 @@
-class CreateAdmins < ActiveRecord::Migration
+class CreateAdmins < ActiveRecord::Migration[4.2]
   def change
     create_table :admins do |t|
       t.string :email
diff --git a/test/dummy/db/migrate/20160522051816_create_vendors.rb b/test/dummy/db/migrate/20160522051816_create_vendors.rb
index f020eb3..317114a 100644
--- a/test/dummy/db/migrate/20160522051816_create_vendors.rb
+++ b/test/dummy/db/migrate/20160522051816_create_vendors.rb
@@ -1,4 +1,4 @@
-class CreateVendors < ActiveRecord::Migration
+class CreateVendors < ActiveRecord::Migration[4.2]
   def change
     create_table :vendors do |t|
       t.string :email
diff --git a/test/dummy/db/migrate/20160522181712_create_composite_name_entities.rb b/test/dummy/db/migrate/20160522181712_create_composite_name_entities.rb
index 23a843a..002acfb 100644
--- a/test/dummy/db/migrate/20160522181712_create_composite_name_entities.rb
+++ b/test/dummy/db/migrate/20160522181712_create_composite_name_entities.rb
@@ -1,4 +1,4 @@
-class CreateCompositeNameEntities < ActiveRecord::Migration
+class CreateCompositeNameEntities < ActiveRecord::Migration[4.2]
   def change
     create_table :composite_name_entities do |t|
       t.string :email
diff --git a/test/dummy/db/migrate/20161127203222_create_v1_users.rb b/test/dummy/db/migrate/20161127203222_create_v1_users.rb
index 8e7dd58..7fc13d3 100644
--- a/test/dummy/db/migrate/20161127203222_create_v1_users.rb
+++ b/test/dummy/db/migrate/20161127203222_create_v1_users.rb
@@ -1,4 +1,4 @@
-class CreateV1Users < ActiveRecord::Migration
+class CreateV1Users < ActiveRecord::Migration[4.2]
   def change
     create_table :v1_users do |t|