diff --git a/lib/active_model/array_serializer.rb b/lib/active_model/array_serializer.rb
index a078d0c6..2ff339b5 100644
--- a/lib/active_model/array_serializer.rb
+++ b/lib/active_model/array_serializer.rb
@@ -1,3 +1,5 @@
+require 'active_model/serializer'
+
 module ActiveModel
   class ArraySerializer
     class << self
diff --git a/lib/active_model/serializer.rb b/lib/active_model/serializer.rb
index 940d59fa..b2b852cc 100644
--- a/lib/active_model/serializer.rb
+++ b/lib/active_model/serializer.rb
@@ -1,3 +1,4 @@
+require 'active_model/array_serializer'
 require 'active_model/serializer/associations'
 
 module ActiveModel
diff --git a/lib/active_model/serializer/associations.rb b/lib/active_model/serializer/associations.rb
index f255b674..5b6365e2 100644
--- a/lib/active_model/serializer/associations.rb
+++ b/lib/active_model/serializer/associations.rb
@@ -1,3 +1,5 @@
+require 'active_model/serializer'
+
 module ActiveModel
   class Serializer
     class Association
diff --git a/lib/active_model_serializers.rb b/lib/active_model_serializers.rb
index 5ecc1b06..c3e40c4b 100644
--- a/lib/active_model_serializers.rb
+++ b/lib/active_model_serializers.rb
@@ -1,6 +1,6 @@
 require 'active_model'
 require 'active_model/serializer'
-require 'active_model/array_serializer'
+require 'active_model/serializer/version'
 
 begin
   require 'action_controller'
diff --git a/test/integration/action_controller/serialization_test.rb b/test/integration/action_controller/serialization_test.rb
index b79330f0..fe356cbc 100644
--- a/test/integration/action_controller/serialization_test.rb
+++ b/test/integration/action_controller/serialization_test.rb
@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model_serializers'
 
 module ActionController
   module Serialization
diff --git a/test/integration/active_record/active_record_test.rb b/test/integration/active_record/active_record_test.rb
index 9529da1e..cfd04410 100644
--- a/test/integration/active_record/active_record_test.rb
+++ b/test/integration/active_record/active_record_test.rb
@@ -1,6 +1,5 @@
 require 'test_helper'
 require 'fixtures/active_record'
-require 'active_model/serializer'
 
 module ActiveModel
   class Serializer
diff --git a/test/test_helper.rb b/test/test_helper.rb
index bb2eb5dc..f5c6d8f9 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,6 +1,6 @@
 require 'bundler/setup'
-require 'active_model_serializers'
 require 'test/unit'
+require 'active_model_serializers'
 require 'fixtures/poro'
 
 module TestHelper
diff --git a/test/unit/active_model/array_serializer/root_test.rb b/test/unit/active_model/array_serializer/root_test.rb
index 372d1833..01aebf3d 100644
--- a/test/unit/active_model/array_serializer/root_test.rb
+++ b/test/unit/active_model/array_serializer/root_test.rb
@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model/serializer'
 
 module ActiveModel
   class ArraySerializer
diff --git a/test/unit/active_model/array_serializer/serialize_test.rb b/test/unit/active_model/array_serializer/serialize_test.rb
index ad7a935a..33d3c0f8 100644
--- a/test/unit/active_model/array_serializer/serialize_test.rb
+++ b/test/unit/active_model/array_serializer/serialize_test.rb
@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model/serializer'
 
 module ActiveModel
   class ArraySerializer
diff --git a/test/unit/active_model/serializer/attributes_test.rb b/test/unit/active_model/serializer/attributes_test.rb
index bc02f714..10bad2b7 100644
--- a/test/unit/active_model/serializer/attributes_test.rb
+++ b/test/unit/active_model/serializer/attributes_test.rb
@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model/serializer'
 
 module ActiveModel
   class Serializer
diff --git a/test/unit/active_model/serializer/has_many_test.rb b/test/unit/active_model/serializer/has_many_test.rb
index 63195cce..cc70338a 100644
--- a/test/unit/active_model/serializer/has_many_test.rb
+++ b/test/unit/active_model/serializer/has_many_test.rb
@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model/serializer'
 
 module ActiveModel
   class Serializer
diff --git a/test/unit/active_model/serializer/has_one_test.rb b/test/unit/active_model/serializer/has_one_test.rb
index 05ba59f3..bbec3967 100644
--- a/test/unit/active_model/serializer/has_one_test.rb
+++ b/test/unit/active_model/serializer/has_one_test.rb
@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model/serializer'
 
 module ActiveModel
   class Serializer
diff --git a/test/unit/active_model/serializer/meta_test.rb b/test/unit/active_model/serializer/meta_test.rb
index 73f843de..a006bf1e 100644
--- a/test/unit/active_model/serializer/meta_test.rb
+++ b/test/unit/active_model/serializer/meta_test.rb
@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model/serializer'
 
 module ActiveModel
   class Serializer
diff --git a/test/unit/active_model/serializer/root_test.rb b/test/unit/active_model/serializer/root_test.rb
index cad83cc7..53a1658e 100644
--- a/test/unit/active_model/serializer/root_test.rb
+++ b/test/unit/active_model/serializer/root_test.rb
@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model/serializer'
 
 module ActiveModel
   class Serializer
diff --git a/test/unit/active_model/serializer/scope_test.rb b/test/unit/active_model/serializer/scope_test.rb
index 4b67190c..78c1b8d7 100644
--- a/test/unit/active_model/serializer/scope_test.rb
+++ b/test/unit/active_model/serializer/scope_test.rb
@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model/serializer'
 
 module ActiveModel
   class Serializer