diff --git a/.travis.yml b/.travis.yml
index 1cdf0965..a113572c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,8 @@ language: ruby
 rvm:
   - 1.9.3
   - 2.0.0
+  - rbx
+  - jruby-19mode
 gemfile:
   - gemfiles/Gemfile.rails-head
   - Gemfile
diff --git a/Gemfile b/Gemfile
index d2d6ea04..c6cc84a8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,10 +2,15 @@ source 'https://rubygems.org'
 
 gemspec
 
+platforms :rbx do
+  gem 'rubysl', '~> 2.0'
+  gem 'rubinius-developer_tools'
+end
+
 gem 'country_select', '~> 1.1.1'
 gem 'railties', github: 'rails/rails', branch: '4-0-stable'
 gem 'activemodel', github: 'rails/rails', branch: '4-0-stable'
 gem 'actionpack', github: 'rails/rails', branch: '4-0-stable'
 gem 'rake'
-gem 'rdoc'
 gem 'tzinfo'
+gem 'rdoc'
diff --git a/Gemfile.lock b/Gemfile.lock
deleted file mode 100644
index 8cfe7adc..00000000
--- a/Gemfile.lock
+++ /dev/null
@@ -1,67 +0,0 @@
-GIT
-  remote: git://github.com/rails/rails.git
-  revision: b632a8237745c62747558551c74e32a3bb056e09
-  branch: 4-0-stable
-  specs:
-    actionpack (4.0.2)
-      activesupport (= 4.0.2)
-      builder (~> 3.1.0)
-      erubis (~> 2.7.0)
-      rack (~> 1.5.2)
-      rack-test (~> 0.6.2)
-    activemodel (4.0.2)
-      activesupport (= 4.0.2)
-      builder (~> 3.1.0)
-    activesupport (4.0.2)
-      i18n (~> 0.6, >= 0.6.4)
-      minitest (~> 4.2)
-      multi_json (~> 1.3)
-      thread_safe (~> 0.1)
-      tzinfo (~> 0.3.37)
-    railties (4.0.2)
-      actionpack (= 4.0.2)
-      activesupport (= 4.0.2)
-      rake (>= 0.8.7)
-      thor (>= 0.18.1, < 2.0)
-
-PATH
-  remote: .
-  specs:
-    simple_form (3.0.1)
-      actionpack (>= 4.0.0, < 4.1)
-      activemodel (>= 4.0.0, < 4.1)
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    atomic (1.1.14)
-    builder (3.1.4)
-    country_select (1.1.3)
-    erubis (2.7.0)
-    i18n (0.6.9)
-    json (1.8.1)
-    minitest (4.7.5)
-    multi_json (1.8.2)
-    rack (1.5.2)
-    rack-test (0.6.2)
-      rack (>= 1.0)
-    rake (10.1.0)
-    rdoc (4.0.1)
-      json (~> 1.4)
-    thor (0.18.1)
-    thread_safe (0.1.3)
-      atomic
-    tzinfo (0.3.38)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  actionpack!
-  activemodel!
-  country_select (~> 1.1.1)
-  railties!
-  rake
-  rdoc
-  simple_form!
-  tzinfo
diff --git a/Rakefile b/Rakefile
index 1d7322ee..52fa23e1 100644
--- a/Rakefile
+++ b/Rakefile
@@ -3,7 +3,6 @@
 require 'bundler/gem_tasks'
 
 require 'rake/testtask'
-require 'rdoc/task'
 
 desc 'Default: run unit tests.'
 task default: :test
@@ -16,11 +15,16 @@ Rake::TestTask.new(:test) do |t|
   t.verbose = true
 end
 
-desc 'Generate documentation for the simple_form plugin.'
-RDoc::Task.new(:rdoc) do |rdoc|
-  rdoc.rdoc_dir = 'rdoc'
-  rdoc.title    = 'SimpleForm'
-  rdoc.options << '--line-numbers'
-  rdoc.rdoc_files.include('README.md')
-  rdoc.rdoc_files.include('lib/**/*.rb')
+begin
+  require 'rdoc/task'
+  desc 'Generate documentation for the simple_form plugin.'
+  RDoc::Task.new(:rdoc) do |rdoc|
+    rdoc.rdoc_dir = 'rdoc'
+    rdoc.title    = 'SimpleForm'
+    rdoc.options << '--line-numbers'
+    rdoc.rdoc_files.include('README.md')
+    rdoc.rdoc_files.include('lib/**/*.rb')
+  end
+rescue LoadError
+  puts 'RDoc::Task is not supported on this platform'
 end
diff --git a/gemfiles/Gemfile.rails-head b/gemfiles/Gemfile.rails-head
index 968c0042..f479bf7d 100644
--- a/gemfiles/Gemfile.rails-head
+++ b/gemfiles/Gemfile.rails-head
@@ -2,10 +2,14 @@ source 'https://rubygems.org'
 
 gemspec :path => '..'
 
+platforms :rbx do
+  gem 'rubysl', '~> 2.0'
+  gem 'rubinius-developer_tools'
+end
+
 gem 'country_select', '~> 1.1.1'
 gem 'railties', github: 'rails/rails'
 gem 'activemodel', github: 'rails/rails'
 gem 'actionpack', github: 'rails/rails'
 gem 'rake'
-gem 'rdoc'
 gem 'tzinfo'