diff --git a/.gitignore b/.gitignore
index 222d8a4..16b94dc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,6 +21,7 @@ coverage
 rdoc
 pkg
 .ruby-version
+gemfiles/*.gemfile.lock
 Gemfile.lock
 
 ## PROJECT::RVM
diff --git a/Appraisals b/Appraisals
new file mode 100644
index 0000000..b36e277
--- /dev/null
+++ b/Appraisals
@@ -0,0 +1,31 @@
+appraise 'rails-3.2' do
+  gem 'activesupport', '~> 3.2.0'
+  gem 'activerecord', '~> 3.2.0'
+  gem 'mongoid', '~> 3.0.0'
+end
+
+appraise 'mongoid-3.1' do
+  gem 'activesupport', '~> 3.2.0'
+  gem 'activerecord', '~> 3.2.0'
+  gem 'mongoid', '~> 3.1.0'
+end
+
+appraise 'rails-4.0' do
+  gem 'activesupport', '~> 4.0.0'
+  gem 'activerecord', '~> 4.0.0'
+end
+
+appraise 'rails-4.1' do
+  gem 'activesupport', '~> 4.1.0'
+  gem 'actionview', '~> 4.1.0'
+  gem 'activerecord', '~> 4.1.0'
+  gem 'mongoid', '~> 4.0.0'
+end
+
+appraise 'rails-4.2' do
+  gem 'activesupport', '~> 4.2.0'
+  gem 'actionview', '~> 4.2.0'
+  gem 'activerecord', '~> 4.2.0'
+  gem 'mongoid', '~> 4.0.0'
+end
+
diff --git a/Gemfile b/Gemfile
index b67838e..2aa9854 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,18 +3,6 @@ gemspec
 
 group :development do
 
-  # ActionView extension
-  # ####################
-  gem 'actionview', '>= 4.2.0'
-
-  # ActiveSupport extension
-  # #######################
-  gem 'activesupport', '>= 4.2.0'
-
-  # ActiveRecord extension
-  # ######################
-  # * To simplify creating test models we use an in-memory SQLite DB
-  gem 'activerecord', '>= 4.2.0'
   gem 'sqlite3'
 
   # MongoMapper extension
@@ -33,9 +21,4 @@ group :development do
   # * Ripple is abandoned http://basho.com/tag/ripple-client-apis/
   # * Ripple is not currently compatible with Rails 4
   # gem 'ripple', '~> 0.9.5'
-
-  # Mongoid extension
-  # #################
-  # * cannot be enabled at the same time as mongo_mapper
-  gem 'mongoid', '>= 4.0.0' 
 end
diff --git a/Rakefile b/Rakefile
index f2bc512..322b7c3 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,7 +1,20 @@
+require "rubygems"
+require "bundler/setup"
+
 require "bundler"
 Bundler::GemHelper.install_tasks
 
-task :default => :spec
+task :default do
+  if ENV['BUNDLE_GEMFILE'] =~ /gemfiles/
+    Rake::Task['spec'].invoke
+  else
+    Rake::Task['appraise'].invoke
+  end
+end
+
+task :appraise do
+  exec 'appraisal install && appraisal rake'
+end
 
 desc "Run all awesome_print gem specs"
 task :spec do
diff --git a/awesome_print.gemspec b/awesome_print.gemspec
index 75394c1..7c118d9 100644
--- a/awesome_print.gemspec
+++ b/awesome_print.gemspec
@@ -24,5 +24,6 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
 
   s.add_development_dependency "rspec",  ">= 3.0.0"
+  s.add_development_dependency "appraisal"
   s.add_development_dependency "fakefs", ">= 0.2.1"
 end
diff --git a/gemfiles/mongoid_3.1.gemfile b/gemfiles/mongoid_3.1.gemfile
new file mode 100644
index 0000000..e946ba2
--- /dev/null
+++ b/gemfiles/mongoid_3.1.gemfile
@@ -0,0 +1,14 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "activesupport", "~> 3.2.0"
+gem "activerecord", "~> 3.2.0"
+gem "mongoid", "~> 3.1.0"
+
+group :development do
+  gem "sqlite3"
+  gem "nokogiri", ">= 1.6.5"
+end
+
+gemspec :path => "../"
diff --git a/gemfiles/rails_3.2.gemfile b/gemfiles/rails_3.2.gemfile
new file mode 100644
index 0000000..fbbb4de
--- /dev/null
+++ b/gemfiles/rails_3.2.gemfile
@@ -0,0 +1,14 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "activesupport", "~> 3.2.0"
+gem "activerecord", "~> 3.2.0"
+gem "mongoid", "~> 3.0.0"
+
+group :development do
+  gem "sqlite3"
+  gem "nokogiri", ">= 1.6.5"
+end
+
+gemspec :path => "../"
diff --git a/gemfiles/rails_4.0.1.gemfile b/gemfiles/rails_4.0.1.gemfile
new file mode 100644
index 0000000..38e2990
--- /dev/null
+++ b/gemfiles/rails_4.0.1.gemfile
@@ -0,0 +1,14 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "activesupport", "~> 4.0.1"
+gem "activerecord", "~> 4.0.1"
+gem "mongoid", "~> 4.0.0"
+
+group :development do
+  gem "sqlite3"
+  gem "nokogiri", ">= 1.6.5"
+end
+
+gemspec :path => "../"
diff --git a/gemfiles/rails_4.0.gemfile b/gemfiles/rails_4.0.gemfile
new file mode 100644
index 0000000..2e7f5ed
--- /dev/null
+++ b/gemfiles/rails_4.0.gemfile
@@ -0,0 +1,13 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "activesupport", "~> 4.0.0"
+gem "activerecord", "~> 4.0.0"
+
+group :development do
+  gem "sqlite3"
+  gem "nokogiri", ">= 1.6.5"
+end
+
+gemspec :path => "../"
diff --git a/gemfiles/rails_4.1.gemfile b/gemfiles/rails_4.1.gemfile
new file mode 100644
index 0000000..a36972d
--- /dev/null
+++ b/gemfiles/rails_4.1.gemfile
@@ -0,0 +1,15 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "activesupport", "~> 4.1.0"
+gem "actionview", "~> 4.1.0"
+gem "activerecord", "~> 4.1.0"
+gem "mongoid", "~> 4.0.0"
+
+group :development do
+  gem "sqlite3"
+  gem "nokogiri", ">= 1.6.5"
+end
+
+gemspec :path => "../"
diff --git a/gemfiles/rails_4.2.gemfile b/gemfiles/rails_4.2.gemfile
new file mode 100644
index 0000000..7130e17
--- /dev/null
+++ b/gemfiles/rails_4.2.gemfile
@@ -0,0 +1,15 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "activesupport", "~> 4.2.0"
+gem "actionview", "~> 4.2.0"
+gem "activerecord", "~> 4.2.0"
+gem "mongoid", "~> 4.0.0"
+
+group :development do
+  gem "sqlite3"
+  gem "nokogiri", ">= 1.6.5"
+end
+
+gemspec :path => "../"