diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6bf514dd..842ce6a4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -3,6 +3,26 @@ on:
   - push
 
 jobs:
+  test-truffleruby:
+    name: Test TruffleRuby
+    runs-on: ubuntu-20.04
+    env:
+      TRUFFLERUBYOPT: "--jvm --polyglot"
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: truffleruby+graalvm-head
+      - name: Install GraalVM js component
+        run: if ! gu list | grep '^js '; then gu install js; fi
+      - name: Bundle
+        run: bundle install
+      - name: Compile
+        run: bundle exec rake compile
+      - name: Test
+        run: bundle exec rake test
   test-darwin:
     strategy:
       fail-fast: false
diff --git a/Rakefile b/Rakefile
index d7d888c8..3a44cb04 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,6 +1,5 @@
 require "bundler/gem_tasks"
 require "rake/testtask"
-require "rake/extensiontask"
 
 Rake::TestTask.new(:test) do |t|
   t.libs << "test"
@@ -11,8 +10,21 @@ end
 task :default => [:compile, :test]
 
 gem = Gem::Specification.load( File.dirname(__FILE__) + '/mini_racer.gemspec' )
-Rake::ExtensionTask.new( 'mini_racer_loader', gem )
-Rake::ExtensionTask.new( 'mini_racer_extension', gem )
+
+if RUBY_ENGINE == "truffleruby"
+  task :compile do
+    # noop
+  end
+
+  task :clean do
+    # noop
+  end
+else
+  require 'rake/extensiontask'
+  Rake::ExtensionTask.new( 'mini_racer_loader', gem )
+  Rake::ExtensionTask.new( 'mini_racer_extension', gem )
+end
+
 
 
 # via http://blog.flavorjon.es/2009/06/easily-valgrind-gdb-your-ruby-c.html
diff --git a/ext/mini_racer_extension/extconf.rb b/ext/mini_racer_extension/extconf.rb
index 6a24e002..1ae6f474 100644
--- a/ext/mini_racer_extension/extconf.rb
+++ b/ext/mini_racer_extension/extconf.rb
@@ -1,4 +1,10 @@
 require 'mkmf'
+
+if RUBY_ENGINE == "truffleruby"
+  File.write("Makefile", dummy_makefile($srcdir).join(""))
+  return
+end
+
 require_relative '../../lib/mini_racer/version'
 gem 'libv8-node', MiniRacer::LIBV8_NODE_VERSION
 require 'libv8-node'
diff --git a/ext/mini_racer_loader/extconf.rb b/ext/mini_racer_loader/extconf.rb
index 15d8ddf0..209340ca 100644
--- a/ext/mini_racer_loader/extconf.rb
+++ b/ext/mini_racer_loader/extconf.rb
@@ -1,5 +1,10 @@
 require 'mkmf'
 
+if RUBY_ENGINE == "truffleruby"
+  File.write("Makefile", dummy_makefile($srcdir).join(""))
+  return
+end
+
 extension_name = 'mini_racer_loader'
 dir_config extension_name
 
diff --git a/lib/mini_racer.rb b/lib/mini_racer.rb
index ad57c5a2..7f4a0d7c 100644
--- a/lib/mini_racer.rb
+++ b/lib/mini_racer.rb
@@ -1,14 +1,18 @@
 require "mini_racer/version"
-require "mini_racer_loader"
 require "pathname"
 
-ext_filename = "mini_racer_extension.#{RbConfig::CONFIG['DLEXT']}"
-ext_path = Gem.loaded_specs['mini_racer'].require_paths
-  .map { |p| (p = Pathname.new(p)).absolute? ? p : Pathname.new(__dir__).parent + p }
-ext_found = ext_path.map { |p| p + ext_filename }.find { |p| p.file? }
-
-raise LoadError, "Could not find #{ext_filename} in #{ext_path.map(&:to_s)}" unless ext_found
-MiniRacer::Loader.load(ext_found.to_s)
+if RUBY_ENGINE == "truffleruby"
+  require "mini_racer/truffleruby"
+else
+  require "mini_racer_loader" 
+  ext_filename = "mini_racer_extension.#{RbConfig::CONFIG['DLEXT']}"
+  ext_path = Gem.loaded_specs['mini_racer'].require_paths
+    .map { |p| (p = Pathname.new(p)).absolute? ? p : Pathname.new(__dir__).parent + p }
+  ext_found = ext_path.map { |p| p + ext_filename }.find { |p| p.file? }
+
+  raise LoadError, "Could not find #{ext_filename} in #{ext_path.map(&:to_s)}" unless ext_found
+  MiniRacer::Loader.load(ext_found.to_s)
+end
 
 require "thread"
 require "json"
diff --git a/lib/mini_racer/truffleruby.rb b/lib/mini_racer/truffleruby.rb
new file mode 100644
index 00000000..6281a036
--- /dev/null
+++ b/lib/mini_racer/truffleruby.rb
@@ -0,0 +1,368 @@
+# frozen_string_literal: true
+
+module MiniRacer
+
+  class Context
+
+    class ExternalFunction
+      private
+
+      def notify_v8
+        name = @name.encode(::Encoding::UTF_8)
+        wrapped = lambda do |*args|
+          converted = @parent.send(:convert_js_to_ruby, args)
+          begin
+            result = @callback.call(*converted)
+          rescue Polyglot::ForeignException => e
+            e = RuntimeError.new(e.message)
+            e.set_backtrace(e.backtrace)
+            @parent.instance_variable_set(:@current_exception, e)
+            raise e
+          rescue => e
+            @parent.instance_variable_set(:@current_exception, e)
+            raise e
+          end
+          @parent.send(:convert_ruby_to_js, result)
+        end
+
+        if @parent_object.nil?
+          # set global name to proc
+          result = @parent.eval_in_context('this')
+          result[name] = wrapped
+        else
+          parent_object_eval = @parent_object_eval.encode(::Encoding::UTF_8)
+          begin
+            result = @parent.eval_in_context(parent_object_eval)
+          rescue Polyglot::ForeignException, StandardError => e
+            raise ParseError, "Was expecting #{@parent_object} to be an object", e.backtrace
+          end
+          result[name] = wrapped
+          # set evaluated object results name to proc
+        end
+      end
+    end
+
+    def heap_stats
+      {
+        total_physical_size: 0,
+        total_heap_size_executable: 0,
+        total_heap_size: 0,
+        used_heap_size: 0,
+        heap_size_limit: 0,
+      }
+    end
+
+    def stop
+      if @entered
+        @context.stop
+        @stopped = true
+        stop_attached
+      end
+    end
+
+    private
+
+    @context_initialized = false
+    @use_strict = false
+
+    def init_unsafe(isolate, snapshot)
+      unless defined?(Polyglot::InnerContext)
+        raise "TruffleRuby #{RUBY_ENGINE_VERSION} does not have support for inner contexts, use a more recent version"
+      end
+
+      unless Polyglot.languages.include? "js"
+        warn "You also need to install the 'js' component with 'gu install js' on GraalVM 22.2+", uplevel: 0 if $VERBOSE
+      end
+
+      @context = Polyglot::InnerContext.new(on_cancelled: -> { 
+        raise ScriptTerminatedError, 'JavaScript was terminated (either by timeout or explicitly)' 
+      })
+      Context.instance_variable_set(:@context_initialized, true)
+      @js_object = @context.eval('js', 'Object')
+      @isolate_mutex = Mutex.new
+      @stopped = false
+      @entered = false
+      @has_entered = false
+      @current_exception = nil
+      if isolate && snapshot
+        isolate.instance_variable_set(:@snapshot, snapshot)
+      end
+      if snapshot
+        @snapshot = snapshot
+      elsif isolate
+        @snapshot = isolate.instance_variable_get(:@snapshot)
+      else
+        @snapshot = nil
+      end
+      @json_stringify_func, @is_object_or_array_func, @is_time_func, @js_date_to_time_func, @is_symbol_func, @js_symbol_to_symbol_func, @js_new_date_func, @js_new_array_func = eval_in_context <<-CODE
+        [
+          (x) => { return JSON.stringify(x) },
+          (x) => { return (x instanceof Object || x instanceof Array) && !(x instanceof Date) && !(x instanceof Function) },
+          (x) => { return x instanceof Date },
+          (x) => { return x.getTime(x) },
+          (x) => { return typeof x === 'symbol' },
+          (x) => { var r = x.description; return r === undefined ? 'undefined' : r },
+          (x) => { return new Date(x) },
+          (x) => { return new Array(x) },
+        ]
+      CODE
+    end
+
+    def dispose_unsafe
+      @context.close
+    end
+
+    def eval_unsafe(str, filename)
+      @entered = true
+      if !@has_entered && @snapshot
+        snapshot_src = encode(@snapshot.instance_variable_get(:@source))
+        begin
+          eval_in_context(snapshot_src, filename)
+        rescue Polyglot::ForeignException => e
+          raise RuntimeError, e.message, e.backtrace
+        end
+      end
+      @has_entered = true
+      raise RuntimeError, "TruffleRuby does not support eval after stop" if @stopped
+      Truffle::Type.rb_check_type(str, String)
+      Truffle::Type.rb_check_type(filename, String) unless filename.nil?
+
+      str = encode(str)
+      begin
+        translate do
+          eval_in_context(str, filename)
+        end
+      rescue Polyglot::ForeignException => e
+        raise RuntimeError, e.message, e.backtrace
+      rescue ::RuntimeError => e
+        if @current_exception
+          e = @current_exception
+          @current_exception = nil
+          raise e
+        else
+          raise e, e.message
+        end
+      end
+    ensure
+      @entered = false
+    end
+
+    def call_unsafe(function_name, *arguments)
+      @entered = true
+      if !@has_entered && @snapshot
+        src = encode(@snapshot.instance_variable_get(:source))
+        begin
+          eval_in_context(src)
+        rescue Polyglot::ForeignException => e
+          raise RuntimeError, e.message, e.backtrace
+        end
+      end
+      @has_entered = true
+      raise RuntimeError, "TruffleRuby does not support call after stop" if @stopped
+      begin
+        translate do
+          function = eval_in_context(function_name)
+          function.call(*convert_ruby_to_js(arguments))
+        end
+      rescue Polyglot::ForeignException => e
+        raise RuntimeError, e.message, e.backtrace
+      end
+    ensure
+      @entered = false
+    end
+
+    def create_isolate_value
+      # Returning a dummy object since TruffleRuby does not have a 1-1 concept with isolate.
+      # However, code and ASTs are shared between contexts.
+      Isolate.new
+    end
+
+    def isolate_mutex
+      @isolate_mutex
+    end
+
+    def translate
+      convert_result_to_ruby yield
+    rescue Object => e
+      message = e.message
+      if @current_exception
+        raise @current_exception
+      elsif e.message.start_with?('SyntaxError:')
+        error_class = MiniRacer::ParseError
+      elsif e.is_a?(MiniRacer::ScriptTerminatedError)
+        error_class = MiniRacer::ScriptTerminatedError
+      else
+        error_class = MiniRacer::RuntimeError
+      end
+
+      if error_class == MiniRacer::RuntimeError
+        bls = e.backtrace_locations&.select { |bl| bl.is_a?(Truffle::Interop::BacktraceLocation) && bl.source_location.language == 'js' }
+        if bls && !bls.empty?
+          if '(eval)' != bls[0].path
+            message = "#{e.message}\n at #{bls[0]}\n" + bls[1..].map(&:to_s).join("\n")
+          else
+            message = "#{e.message}\n" + bls.map(&:to_s).join("\n")
+          end
+        end
+        raise error_class, message
+      else
+        raise error_class, message, e.backtrace
+      end
+    end
+
+    def convert_result_to_ruby(value)
+      if object_or_array?(value)
+        JSON.parse(js_json_stringify(value))
+      else
+        convert_js_to_ruby(value)
+      end
+    end
+
+    def convert_js_to_ruby(value)
+      case value
+      when true, false, Integer, Float
+        value
+      else
+        if value.nil?
+          nil
+        elsif value.respond_to?(:call)
+          MiniRacer::JavaScriptFunction.new
+        elsif value.respond_to?(:to_str)
+          value.to_str
+        elsif value.respond_to?(:to_ary)
+          value.to_ary.map do |e|
+            if e.respond_to?(:call)
+              nil
+            else
+              convert_js_to_ruby(e)
+            end
+          end
+        elsif time?(value)
+          js_date_to_time(value)
+        elsif symbol?(value)
+          js_symbol_to_symbol(value)
+        else
+          object = value
+          h = {}
+          object.instance_variables.each do |member|
+            v = object[member]
+            unless v.respond_to?(:call)
+              h[member.to_s] = convert_js_to_ruby(v)
+            end
+          end
+          h
+        end
+      end
+    end
+
+    def js_json_stringify(val)
+      @json_stringify_func.call(val).to_s
+    end
+
+    def object_or_array?(val)
+      @is_object_or_array_func.call(val)
+    end
+
+    def time?(value)
+      @is_time_func.call(value)
+    end
+
+    def js_date_to_time(value)
+      millis = @js_date_to_time_func.call(value)
+      Time.at(Rational(millis, 1000))
+    end
+
+    def symbol?(value)
+      @is_symbol_func.call(value)
+    end
+
+    def js_symbol_to_symbol(value)
+      @js_symbol_to_symbol_func.call(value).to_s.to_sym
+    end
+
+    def js_new_date(value)
+      @js_new_date_func.call(value)
+    end
+
+    def js_new_array(size)
+      @js_new_array_func.call(size)
+    end
+
+    def convert_ruby_to_js(value)
+      case value
+      when nil, true, false, Integer, Float, String
+        value
+      when Array
+        ary = js_new_array(value.size)
+        value.each_with_index do |v, i|
+          ary[i] = convert_ruby_to_js(v)
+        end
+        ary
+      when Hash
+        h = @js_object.new
+        value.each_pair do |k, v|
+          h[convert_ruby_to_js(k.to_s)] = convert_ruby_to_js(v)
+        end
+        h
+      when String
+        Truffle::Interop.as_truffle_string value
+      when Symbol
+        value.to_s
+      when Time
+        js_new_date(value.to_f * 1000)
+      when DateTime
+        js_new_date(value.to_time.to_f * 1000)
+      else
+        "Undefined Conversion"
+      end
+    end
+
+    def encode(string)
+      raise ArgumentError unless string
+      string.encode(::Encoding::UTF_8)
+    end
+
+    class_eval <<-'RUBY', "(mini_racer)", 1
+        def eval_in_context(code, file = nil); code = ('"use strict";' + code) if Context.instance_variable_get(:@use_strict); @context.eval('js', code, file || '(mini_racer)'); end
+    RUBY
+
+  end
+
+  class Isolate
+    def init_with_snapshot(snapshot)
+      # TruffleRuby does not have a 1-1 concept with isolate.
+      # However, isolate can hold a snapshot, and code and ASTs are shared between contexts.
+      @snapshot = snapshot
+    end
+
+    def low_memory_notification
+      GC.start
+    end
+
+    def idle_notification(idle_time)
+      true
+    end
+  end
+
+  class Platform
+    def self.set_flag_as_str!(flag)
+      Truffle::Type.rb_check_type(flag, String)
+      raise MiniRacer::PlatformAlreadyInitialized, "The platform is already initialized." if Context.instance_variable_get(:@context_initialized)
+      Context.instance_variable_set(:@use_strict, true) if "--use_strict" == flag
+    end
+  end
+
+  class Snapshot
+    def load(str)
+      Truffle::Type.rb_check_type(str, String)
+      # Intentionally noop since TruffleRuby mocks the snapshot API
+    end
+
+    def warmup_unsafe!(src)
+      Truffle::Type.rb_check_type(src, String)
+      # Intentionally noop since TruffleRuby mocks the snapshot API
+      # by replaying snapshot source before the first eval/call
+      self
+    end
+  end
+end
diff --git a/test/function_test.rb b/test/function_test.rb
index 84e1a074..3aa13cf6 100644
--- a/test/function_test.rb
+++ b/test/function_test.rb
@@ -35,7 +35,8 @@ def test_throwing_function
       context.call('f', 1)
     end
     assert_equal err.message, 'Error: foo bar'
-    assert_match(/1:23/, err.backtrace[0])
+    assert_match(/1:23/, err.backtrace[0]) unless RUBY_ENGINE == "truffleruby"
+    assert_match(/1:/, err.backtrace[0]) if RUBY_ENGINE == "truffleruby"
   end
 
   def test_args_types
diff --git a/test/mini_racer_test.rb b/test/mini_racer_test.rb
index 9a7e84a3..fd46bf84 100644
--- a/test/mini_racer_test.rb
+++ b/test/mini_racer_test.rb
@@ -10,6 +10,7 @@ class MiniRacerTest < Minitest::Test
 
 
   def test_locale
+    skip "TruffleRuby does not have all js timezone by default" if RUBY_ENGINE == "truffleruby"
     val = MiniRacer::Context.new.eval("new Date('April 28 2021').toLocaleDateString('es-MX');")
     assert_equal '28/4/2021', val
 
@@ -88,7 +89,7 @@ def test_it_can_stop
 
     begin
       Thread.new do
-        sleep 0.001
+        sleep 0.01
         context.stop
       end
       context.eval('while(true){}')
@@ -102,6 +103,7 @@ def test_it_can_stop
   end
 
   def test_it_can_timeout_during_serialization
+    skip "TruffleRuby needs a fix for timing out during translation" if RUBY_ENGINE == "truffleruby"
     context = MiniRacer::Context.new(timeout: 500)
 
     assert_raises(MiniRacer::ScriptTerminatedError) do
@@ -302,12 +304,14 @@ def test_return_unknown
   end
 
   def test_max_memory
+    skip "TruffleRuby does not yet implement max_memory" if RUBY_ENGINE == "truffleruby"
     context = MiniRacer::Context.new(max_memory: 200_000_000)
 
     assert_raises(MiniRacer::V8OutOfMemoryError) { context.eval('let s = 1000; var a = new Array(s); a.fill(0); while(true) {s *= 1.1; let n = new Array(Math.floor(s)); n.fill(0); a = a.concat(n); };') }
   end
 
   def test_max_memory_for_call
+    skip "TruffleRuby does not yet implement max_memory" if RUBY_ENGINE == "truffleruby"
     context = MiniRacer::Context.new(max_memory: 100_000_000)
     context.eval(<<~JS)
       let s;
@@ -399,6 +403,7 @@ def test_it_can_use_snapshots
   end
 
   def test_snapshot_size
+    skip "TruffleRuby does not yet implement snapshots" if RUBY_ENGINE == "truffleruby"
     snapshot = MiniRacer::Snapshot.new('var foo = "bar";')
 
     # for some reason sizes seem to change across runs, so we just
@@ -407,6 +412,7 @@ def test_snapshot_size
   end
 
   def test_snapshot_dump
+    skip "TruffleRuby does not yet implement snapshots" if RUBY_ENGINE == "truffleruby"
     snapshot = MiniRacer::Snapshot.new('var foo = "bar";')
     dump = snapshot.dump
 
@@ -581,13 +587,11 @@ def test_concurrent_access_over_the_same_isolate_1
   def test_concurrent_access_over_the_same_isolate_2
     isolate = MiniRacer::Isolate.new
 
-    equals_after_sleep = {}
-
     # workaround Rubies prior to commit 475c8701d74ebebe
     # (Make SecureRandom support Ractor, 2020-09-04)
     SecureRandom.hex
 
-    (1..10).map do |i|
+    equals_after_sleep = (1..10).map do |i|
       Thread.new {
         random = SecureRandom.hex
         context = MiniRacer::Context.new(isolate: isolate)
@@ -598,12 +602,12 @@ def test_concurrent_access_over_the_same_isolate_2
 
         # cruby hashes are thread safe as long as you don't mess with the
         # same key in different threads
-        equals_after_sleep[i] = context.eval('a') == random
+        context.eval('a') == random
        }
-    end.each(&:join)
+    end.map(&:value)
 
     assert_equal 10, equals_after_sleep.size
-    assert equals_after_sleep.values.all?
+    assert equals_after_sleep.all?
   end
 
   def test_platform_set_flags_raises_an_exception_if_already_initialized
@@ -711,6 +715,7 @@ def test_can_dispose_context
   end
 
   def test_estimated_size
+    skip "TruffleRuby does not yet implement heap_stats" if RUBY_ENGINE == "truffleruby"
     context = MiniRacer::Context.new(timeout: 5)
     context.eval("let a='testing';")
 
@@ -780,7 +785,7 @@ def test_eval_with_filename
 
   def test_estimated_size_when_disposed
 
-    context = MiniRacer::Context.new(timeout: 5)
+    context = MiniRacer::Context.new(timeout: 50)
     context.eval("let a='testing';")
     context.dispose
 
@@ -805,7 +810,7 @@ def junk_it_up
   end
 
   def test_attached_recursion
-    context = MiniRacer::Context.new(timeout: 20)
+    context = MiniRacer::Context.new(timeout: 200)
     context.attach("a", proc{|a| a})
     context.attach("b", proc{|a| a})
 
@@ -842,6 +847,7 @@ def test_isolate_is_nil_after_disposal
   end
 
   def test_heap_dump
+    skip "TruffleRuby does not yet implement heap_dump" if RUBY_ENGINE == "truffleruby"
     f = Tempfile.new("heap")
     path = f.path
     f.unlink
@@ -873,6 +879,7 @@ def test_symbol_support
   end
 
   def test_cyclical_object_js
+    skip "TruffleRuby does not yet implement marshal_stack_depth" if RUBY_ENGINE == "truffleruby"
     context = MiniRacer::Context.new(marshal_stack_depth: 5)
     context.attach("a", proc{|a| a})
 
@@ -880,6 +887,7 @@ def test_cyclical_object_js
   end
 
   def test_cyclical_array_js
+    skip "TruffleRuby does not yet implement marshal_stack_depth" if RUBY_ENGINE == "truffleruby"
     context = MiniRacer::Context.new(marshal_stack_depth: 5)
     context.attach("a", proc{|a| a})
 
@@ -887,6 +895,7 @@ def test_cyclical_array_js
   end
 
   def test_cyclical_elem_in_array_js
+    skip "TruffleRuby does not yet implement marshal_stack_depth" if RUBY_ENGINE == "truffleruby"
     context = MiniRacer::Context.new(marshal_stack_depth: 5)
     context.attach("a", proc{|a| a})
 
@@ -894,6 +903,7 @@ def test_cyclical_elem_in_array_js
   end
 
   def test_infinite_object_js
+    skip "TruffleRuby does not yet implement marshal_stack_depth" if RUBY_ENGINE == "truffleruby"
     context = MiniRacer::Context.new(marshal_stack_depth: 5)
     context.attach("a", proc{|a| a})
   
@@ -911,6 +921,7 @@ def test_infinite_object_js
   end
 
   def test_deep_object_js
+    skip "TruffleRuby does not yet implement marshal_stack_depth" if RUBY_ENGINE == "truffleruby"
     context = MiniRacer::Context.new(marshal_stack_depth: 5)
     context.attach("a", proc{|a| a})
 
@@ -966,6 +977,7 @@ def test_promise
   end
 
   def test_webassembly
+    skip "TruffleRuby does not enable WebAssembly by default" if RUBY_ENGINE == "truffleruby"
     context = MiniRacer::Context.new()
     context.eval("let instance = null;")
     filename = File.expand_path("../support/add.wasm", __FILE__)
diff --git a/test/test_forking.rb b/test/test_forking.rb
index c849f0ed..8490b03c 100644
--- a/test/test_forking.rb
+++ b/test/test_forking.rb
@@ -23,6 +23,6 @@ def trigger_gc
 
 MiniRacer::Context.new.dispose
 
-Process.wait fork { puts @ctx.eval("a"); @ctx.dispose; puts Process.pid; trigger_gc; puts "done #{Process.pid}" }
-
-
+if Process.respond_to?(:fork)
+  Process.wait fork { puts @ctx.eval("a"); @ctx.dispose; puts Process.pid; trigger_gc; puts "done #{Process.pid}" }
+end