diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c02cbf1..b79c582 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,5 +19,3 @@ jobs:
           bundler-cache: true
       - name: Runs tests
         run: bundle exec rake test
-        env:
-          TEST: true
diff --git a/Gemfile b/Gemfile
index ad1e4e3..ebb1564 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,8 +6,8 @@ gem "middleman-core", git: "https://github.com/middleman/middleman.git"
 gemspec
 
 # Build and doc tools
-gem 'rake', '~> 10.3', require: false
-gem 'yard', '~> 0.8', require: false
+gem 'rake', '~> 13.1', require: false
+gem 'yard', '~> 0.9', require: false
 
 # Test tools
 gem 'pry', '~> 0.10', group: :development
@@ -15,13 +15,10 @@ gem 'aruba', '~> 1.0.0'
 gem 'rspec', '~> 3.0'
 gem 'cucumber', '~> 2.0'
 gem 'capybara', '~> 2.5.0'
-gem 'haml', '< 6'
-gem 'slim', '< 5'
+gem 'haml', RUBY_VERSION > '3.0' ? '< 7' : '< 6'
+gem 'slim', '>= 3', '< 5'
 gem 'kramdown'
 gem "redcarpet"
 
-# Code Quality
-gem "cane", require: false
-
 # For old Rubies
 gem 'nokogiri', '~> 1.12.0'
diff --git a/README.md b/README.md
index 79ab63c..fc27a7d 100644
--- a/README.md
+++ b/README.md
@@ -196,7 +196,7 @@ The best way to get quick responses to your issues and swift fixes to your bugs
 
 ## Donate
 
-[Click here to lend your support to Middleman](https://spacebox.io/s/4dXbHBorC3)
+[Click here to lend your support to Middleman](https://github.com/sponsors/tdreyno)
 
 ## License
 
@@ -205,6 +205,4 @@ Copyright (c) 2012-2014 Benjamin Hollis. MIT Licensed, see [LICENSE] for details
 [middleman]: http://middlemanapp.com
 [gem]: https://rubygems.org/gems/middleman-syntax
 [travis]: http://travis-ci.org/middleman/middleman-syntax
-[gemnasium]: https://gemnasium.com/middleman/middleman-syntax
-[codeclimate]: https://codeclimate.com/github/middleman/middleman-syntax
 [LICENSE]: https://github.com/middleman/middleman-syntax/blob/master/LICENSE.md
diff --git a/Rakefile b/Rakefile
index df9d58d..cdb49fc 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,6 +1,4 @@
-require 'bundler'
-Bundler::GemHelper.install_tasks
-
+require 'bundler/gem_tasks'
 require 'cucumber/rake/task'
 
 Cucumber::Rake::Task.new(:cucumber, 'Run features that should pass') do |t|
@@ -9,23 +7,7 @@ Cucumber::Rake::Task.new(:cucumber, 'Run features that should pass') do |t|
   t.cucumber_opts = "--color --tags ~@wip #{exempt_tags} --strict --format #{ENV['CUCUMBER_FORMAT'] || 'pretty'}"
 end
 
-require 'rake/clean'
-
 task :test => ["cucumber"]
-
-begin
-  require 'cane/rake_task'
-
-  desc "Run cane to check quality metrics"
-  Cane::RakeTask.new(:quality) do |cane|
-    cane.no_style = true
-    cane.no_doc = true
-    cane.abc_glob = "lib/middleman-syntax/**/*.rb"
-  end
-rescue LoadError
-  # warn "cane not available, quality task not provided."
-end
-
 task :default => :test
 
 desc "Build HTML documentation"
diff --git a/lib/middleman-syntax/haml_monkey_patch.rb b/lib/middleman-syntax/haml_monkey_patch.rb
index 5e0bea8..ccc6de2 100644
--- a/lib/middleman-syntax/haml_monkey_patch.rb
+++ b/lib/middleman-syntax/haml_monkey_patch.rb
@@ -21,8 +21,14 @@ def render(code)
     module Haml
       class Filters
         class Code < Base
-          extend HamlMonkeyPatch
+          include HamlMonkeyPatch
+
+          def compile(node)
+            [:static, render(node.value[:text])]
+          end
         end
+
+        register :code, Code
       end
     end
   else
diff --git a/middleman-syntax.gemspec b/middleman-syntax.gemspec
index 860c172..6ffe6f0 100644
--- a/middleman-syntax.gemspec
+++ b/middleman-syntax.gemspec
@@ -1,6 +1,4 @@
-# -*- encoding: utf-8 -*-
-$:.push File.expand_path("../lib", __FILE__)
-require "middleman-syntax/version"
+require "./lib/middleman-syntax/version"
 
 Gem::Specification.new do |s|
   s.name = "middleman-syntax"