diff --git a/.travis.yml b/.travis.yml
index befddbc6..2cc4065b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -33,10 +33,18 @@ env:
 
 matrix:
   exclude:
+    - rvm: 1.9.3
+      env: RAILS_VERSION=master
+    - rvm: 2.0.0
+      env: RAILS_VERSION=master
     - rvm: 2.1
       env: RAILS_VERSION=master
     - rvm: jruby-9.1.5.0
       env: RAILS_VERSION=master
+    - rvm: 1.9.3
+      env: RAILS_VERSION=5.0
+    - rvm: 2.0.0
+      env: RAILS_VERSION=5.0
     - rvm: 2.1
       env: RAILS_VERSION=5.0
     - rvm: jruby-9.1.5.0
diff --git a/Gemfile b/Gemfile
index e55e2bfe..d5d669a1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,11 +6,14 @@ version = ENV["RAILS_VERSION"] || "4.2"
 
 if version == 'master'
   gem 'rack', github: 'rack/rack'
+  gem 'arel', github: 'rails/arel'
+  gem 'rails', github: 'rails/rails'
   git 'https://github.com/rails/rails.git' do
     gem 'railties'
     gem 'activesupport'
     gem 'activemodel'
     gem 'actionpack'
+    gem 'activerecord', group: :test
     # Rails 5
     gem 'actionview'
   end
@@ -18,10 +21,12 @@ if version == 'master'
   gem 'rails-controller-testing', github: 'rails/rails-controller-testing'
 else
   gem_version = "~> #{version}.0"
+  gem 'rails', gem_version
   gem 'railties', gem_version
   gem 'activesupport', gem_version
   gem 'activemodel', gem_version
   gem 'actionpack', gem_version
+  gem 'activerecord', gem_version, group: :test
 end
 
 if RUBY_VERSION < '2'
@@ -36,14 +41,14 @@ end
 @windows_platforms = [:mswin, :mingw, :x64_mingw]
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
-gem 'tzinfo-data', platforms: (@windows_platforms + [:jruby])
+tzinfo_platforms = @windows_platforms
+tzinfo_platforms += [:jruby] if version >= '4.1'
+gem 'tzinfo-data', platforms: tzinfo_platforms
 
 group :test do
-  gem 'activerecord'
   gem 'sqlite3',                          platform: (@windows_platforms + [:ruby])
   gem 'activerecord-jdbcsqlite3-adapter', platform: :jruby
 
-  gem 'codeclimate-test-reporter', require: false
   gem 'simplecov', '~> 0.10', require: false, group: :development
 end
 
diff --git a/lib/active_model/serializer.rb b/lib/active_model/serializer.rb
index 9b3d6e6c..82693873 100644
--- a/lib/active_model/serializer.rb
+++ b/lib/active_model/serializer.rb
@@ -203,7 +203,7 @@ end
         if included_associations.include? name
           association_serializer = build_serializer(association)
           # we must do this always because even if the current association is not
-          # embeded in root, it might have its own associations that are embeded in root
+          # embedded in root, it might have its own associations that are embedded in root
           hash.merge!(association_serializer.embedded_in_root_associations) do |key, oldval, newval|
             if oldval.respond_to?(:to_ary)
               [oldval, newval].flatten.uniq
diff --git a/test/fixtures/poro.rb b/test/fixtures/poro.rb
index e9d36fc0..d122f097 100644
--- a/test/fixtures/poro.rb
+++ b/test/fixtures/poro.rb
@@ -49,7 +49,7 @@ end
 
 class SpecialPost < Post
   def special_comment
-    @speical_comment ||= Comment.new(content: 'special')
+    @special_comment ||= Comment.new(content: 'special')
   end
 end