diff --git a/.gitignore b/.gitignore
index dc124f8..55812f7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,4 +5,5 @@ pkg/*
 *.log
 tmp/*
 test/dummy_app/tmp/cache/assets/*
-gemfiles/*.gemfile
+*.gemfile.lock
+Gemfile.lock
diff --git a/.travis.yml b/.travis.yml
index 72db7c1..743fdff 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,14 +1,37 @@
+language: ruby
+cache: bundler
+sudo: false
 rvm:
-  - 1.9.3
-  - 2.0.0
-  - 2.1.4
-  - jruby-19mode
+  - 1.9.3-p551
+  - 2.0.0-p648
+  - 2.1.10
+  - 2.2.7
+  - 2.3.4
+  - 2.4.1
+  - jruby-9.1.9.0
 before_install:
-  - travis_retry gem install bundler
-  - bundle --version
-install:
-  - travis_retry bundle install
-before_script:
-  - travis_retry bundle exec appraisal install
-script:
-  - bundle exec appraisal rake test
+  - gem install bundler
+gemfile:
+  - gemfiles/rails40.gemfile
+  - gemfiles/rails41.gemfile
+  - gemfiles/rails42.gemfile
+  - gemfiles/rails50.gemfile
+  - gemfiles/rails51.gemfile
+matrix:
+  exclude:
+    - rvm: 1.9.3-p551
+      gemfile: gemfiles/rails50.gemfile
+    - rvm: 1.9.3-p551
+      gemfile: gemfiles/rails51.gemfile
+    - rvm: 2.0.0-p648
+      gemfile: gemfiles/rails50.gemfile
+    - rvm: 2.0.0-p648
+      gemfile: gemfiles/rails51.gemfile
+    - rvm: 2.1.10
+      gemfile: gemfiles/rails50.gemfile
+    - rvm: 2.1.10
+      gemfile: gemfiles/rails51.gemfile
+    - rvm: 2.4.1
+      gemfile: gemfiles/rails40.gemfile
+    - rvm: 2.4.1
+      gemfile: gemfiles/rails41.gemfile
diff --git a/Appraisals b/Appraisals
index e4f4a92..034b201 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,11 +1,19 @@
 appraise 'rails40' do
-  gem 'rails', '~> 4.0.11'
+  gem 'rails', '~> 4.0.13'
 end
 
 appraise 'rails41' do
-  gem 'rails', '~> 4.1.7'
+  gem 'rails', '~> 4.1.16'
 end
 
 appraise 'rails42' do
-  gem 'rails', '~> 4.2.1'
+  gem 'rails', '~> 4.2.8'
+end
+
+appraise 'rails50' do
+  gem 'rails', '~> 5.0.3'
+end
+
+appraise 'rails51' do
+  gem 'rails', '~> 5.1.1'
 end
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0ffa88f..e4db829 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 # CHANGELOG
 
-### 2.8.0 - ?
+### 3.0.0 - 2017-10-02
+
+* Solve deprecation warning via Grease adapter!
+
+### 2.8.0 - 2016-10-12
 
 * Make it possible to pass parameters to less.rb
   Fixes https://github.com/metaskills/less-rails/issues/94
diff --git a/README.md b/README.md
index a47be1a..d9fcc92 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ This gem provides integration for Rails projects using the Less stylesheet langu
 Just bundle up less-rails in your Gemfile. This will pull in less as a runtime dependency too.
 
 ```ruby
-gem 'less-rails', '~> 2.7.0'
+gem 'less-rails', '~> 3.0.0'
 ```
 
 But be warned, less.rb relies on a JavaScript runtime gem too. Just like ExecJS, it will look for a gem that is appropriate to your system. Typically, this means you will need one of the following.
@@ -125,12 +125,12 @@ We also have a generator for rails scaffold CSS. Just like the Sass gem, we simp
 
 ## Contributing
 
-This gem is fully tested from Rails 4.0 to Rails 4.2. We run our tests on [Travis CI](http://travis-ci.org/metaskills/less-rails) in both Ruby 1.9, 2.0, and jRuby 1.9 mode. If you detect a problem, open up a github issue or fork the repo and help out. After you fork or clone the repository, the following commands will get you up and running on the test suite. 
+This gem is fully tested from Rails 4.0 to Rails 5.1. We run our tests on [Travis CI](http://travis-ci.org/metaskills/less-rails) in both Ruby 1.9, 2.0, and JRuby 9000. If you detect a problem, open up a github issue or fork the repo and help out. After you fork or clone the repository, the following commands will get you up and running on the test suite. 
 
 ```shell
-$ bundle install
-$ bundle exec rake appraisal:setup
-$ bundle exec rake appraisal test
+$ bundle
+$ bundle exec appraisal install
+$ bundle exec appraisal rake
 ```
 
 We use the [appraisal](https://github.com/thoughtbot/appraisal) gem from Thoughtbot to help us generate the individual gemfiles for each Rails version and to run the tests locally against each generated Gemfile. The `rake appraisal test` command actually runs our test suite against all Rails versions in our `Appraisal` file. If you want to run the tests for a specific Rails version, use `rake -T` for a list. For example, the following command will run the tests for Rails 4.0 only.
diff --git a/Rakefile b/Rakefile
index a1f9ec0..3031524 100644
--- a/Rakefile
+++ b/Rakefile
@@ -7,6 +7,7 @@ Rake::TestTask.new do |t|
   t.libs = ['lib','test']
   t.test_files = Dir.glob("test/**/*_spec.rb").sort
   t.verbose = true
+  # t.warning = false
 end
 
 task :default => [:test]
diff --git a/gemfiles/rails40.gemfile b/gemfiles/rails40.gemfile
new file mode 100644
index 0000000..10fbe6d
--- /dev/null
+++ b/gemfiles/rails40.gemfile
@@ -0,0 +1,10 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "therubyracer", "~> 0.12.0", require: nil, platforms: :ruby
+gem "therubyrhino", "~> 2.0.2", require: nil, platforms: :jruby
+gem "mime-types", "~> 2.6.2", platforms: [:ruby_19, :jruby]
+gem "rails", "~> 4.0.13"
+
+gemspec path: "../"
diff --git a/gemfiles/rails41.gemfile b/gemfiles/rails41.gemfile
new file mode 100644
index 0000000..d380494
--- /dev/null
+++ b/gemfiles/rails41.gemfile
@@ -0,0 +1,10 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "therubyracer", "~> 0.12.0", require: nil, platforms: :ruby
+gem "therubyrhino", "~> 2.0.2", require: nil, platforms: :jruby
+gem "mime-types", "~> 2.6.2", platforms: [:ruby_19, :jruby]
+gem "rails", "~> 4.1.16"
+
+gemspec path: "../"
diff --git a/gemfiles/rails42.gemfile b/gemfiles/rails42.gemfile
new file mode 100644
index 0000000..8458c61
--- /dev/null
+++ b/gemfiles/rails42.gemfile
@@ -0,0 +1,10 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "therubyracer", "~> 0.12.0", require: nil, platforms: :ruby
+gem "therubyrhino", "~> 2.0.2", require: nil, platforms: :jruby
+gem "mime-types", "~> 2.6.2", platforms: [:ruby_19, :jruby]
+gem "rails", "~> 4.2.8"
+
+gemspec path: "../"
diff --git a/gemfiles/rails50.gemfile b/gemfiles/rails50.gemfile
new file mode 100644
index 0000000..290cbfd
--- /dev/null
+++ b/gemfiles/rails50.gemfile
@@ -0,0 +1,10 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "therubyracer", "~> 0.12.0", require: nil, platforms: :ruby
+gem "therubyrhino", "~> 2.0.2", require: nil, platforms: :jruby
+gem "mime-types", "~> 2.6.2", platforms: [:ruby_19, :jruby]
+gem "rails", "~> 5.0.3"
+
+gemspec path: "../"
diff --git a/gemfiles/rails51.gemfile b/gemfiles/rails51.gemfile
new file mode 100644
index 0000000..bcdd770
--- /dev/null
+++ b/gemfiles/rails51.gemfile
@@ -0,0 +1,10 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "therubyracer", "~> 0.12.0", require: nil, platforms: :ruby
+gem "therubyrhino", "~> 2.0.2", require: nil, platforms: :jruby
+gem "mime-types", "~> 2.6.2", platforms: [:ruby_19, :jruby]
+gem "rails", "~> 5.1.1"
+
+gemspec path: "../"
diff --git a/less-rails.gemspec b/less-rails.gemspec
index a684072..a953eb1 100644
--- a/less-rails.gemspec
+++ b/less-rails.gemspec
@@ -18,6 +18,7 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency 'less', '~> 2.6.0'
   gem.add_runtime_dependency 'actionpack', '>= 4.0'
   gem.add_runtime_dependency 'tilt'
+  gem.add_runtime_dependency 'grease'
   gem.add_runtime_dependency 'sprockets', '> 2', '< 4'
   gem.add_development_dependency 'appraisal'
   gem.add_development_dependency 'minitest'
diff --git a/lib/less/rails/railtie.rb b/lib/less/rails/railtie.rb
index 64b3aa0..c23b937 100644
--- a/lib/less/rails/railtie.rb
+++ b/lib/less/rails/railtie.rb
@@ -1,6 +1,8 @@
+require 'less'
+require 'grease'
 require 'sprockets/railtie'
 
-module Less  
+module Less
   module Rails
     class Railtie < ::Rails::Railtie
       config.less = ActiveSupport::OrderedOptions.new
@@ -10,15 +12,22 @@ class Railtie < ::Rails::Railtie
       config.app_generators.stylesheet_engine :less
 
       config.before_initialize do |app|
-        require 'less'
-        require 'less-rails'
-        Sprockets::Engines #force autoloading
-        Sprockets.register_engine '.less', LessTemplate
+        sprockets_env = app.assets || Sprockets
+        if sprockets_env.respond_to?(:register_engine)
+          args = ['.less', Grease.apply(LessTemplate)]
+          args << { mime_type: 'text/less', silence_deprecation: true } if Sprockets::VERSION.start_with?("3")
+          sprockets_env.register_engine(*args)
+        end
+
+        if sprockets_env.respond_to?(:register_transformer)
+          sprockets_env.register_mime_type 'text/less', extensions: ['.less', '.less.erb', '.less.css'], charset: :css
+          sprockets_env.register_transformer 'text/less', 'text/css', Grease.apply(LessTemplate)
+        end
       end
 
       initializer 'less-rails.before.load_config_initializers', :before => :load_config_initializers, :group => :all do |app|
         sprockets_env = app.assets || Sprockets
-        sprockets_env.register_preprocessor 'text/css', ImportProcessor
+        sprockets_env.register_preprocessor 'text/css', Grease.apply(ImportProcessor)
 
         config.assets.configure do |env|
           env.context_class.class_eval do
@@ -32,11 +41,11 @@ class Railtie < ::Rails::Railtie
         assets_stylesheet_paths = app.config.assets.paths.select { |p| p && p.to_s.ends_with?('stylesheets') }
         app.config.less.paths.unshift(*assets_stylesheet_paths)
       end
-      
+
       initializer 'less-rails.setup_compression', :group => :all do |app|
         config.less.compress = app.config.assets.compress
       end
-      
+
     end
   end
 end
diff --git a/lib/less/rails/version.rb b/lib/less/rails/version.rb
index 18f7161..bd2aebc 100644
--- a/lib/less/rails/version.rb
+++ b/lib/less/rails/version.rb
@@ -1,5 +1,5 @@
 module Less
   module Rails
-    VERSION = "2.8.0"
+    VERSION = "3.0.0"
   end
 end
diff --git a/test/cases/railtie_spec.rb b/test/cases/railtie_spec.rb
index 2eaa63a..21bc5de 100644
--- a/test/cases/railtie_spec.rb
+++ b/test/cases/railtie_spec.rb
@@ -31,7 +31,7 @@ class RailtieSpec < Less::Rails::Spec
   describe 'initialization' do
     
     it 'must register our template engine' do
-      dummy_assets.engines['.less'].must_equal Less::Rails::LessTemplate
+      dummy_assets.engines['.less'].must_be_instance_of Grease::Adapter
     end
     
     it 'must extend the context class with our config' do
@@ -40,7 +40,9 @@ class RailtieSpec < Less::Rails::Spec
     end
     
     it 'must register our import pre processor' do
-      dummy_assets.preprocessors['text/css'].must_include Less::Rails::ImportProcessor
+      dummy_assets.preprocessors['text/css'].any? do |preprocessor|
+        preprocessor.is_a? Grease::Adapter
+      end.must_equal true
     end
     
     it 'must include the asset pipelines stylesheet paths to less paths' do
diff --git a/test/spec_helper.rb b/test/spec_helper.rb
index 6d1da5d..7c5442b 100644
--- a/test/spec_helper.rb
+++ b/test/spec_helper.rb
@@ -100,7 +100,7 @@ def setup_generator_class
       end
       
       def run_generator(args=default_arguments, config={})
-        capture(:stdout) { generator_class.start(args, config.reverse_merge(:destination_root => destination_root)) }
+        generator_class.start(args, config.reverse_merge(:destination_root => destination_root))
       end
 
       def generator(args=default_arguments, options={}, config={})