diff --git a/lib/middleman-imageoptim/extension.rb b/lib/middleman-imageoptim/extension.rb
index 1c14ce8..3d02560 100644
--- a/lib/middleman-imageoptim/extension.rb
+++ b/lib/middleman-imageoptim/extension.rb
@@ -4,6 +4,25 @@ module Middleman
   # Middleman extension entry point
   module Imageoptim
     class Extension < Middleman::Extension
+      if Gem::Version.new(Middleman::VERSION) >= Gem::Version.new('4.0.0')
+        option :advpng, { level: 4 }, ''
+        option :allow_lossy, false, ''
+        option :gifsicle, { interlace: false }, ''
+        option :image_extensions, %w(.png .jpg .jpeg .gif .svg), ''
+        option :jpegoptim, { strip: ['all'], max_quality: 100 }, ''
+        option :jpegtran, { copy_chunks: false, progressive: true, jpegrescan: true }, ''
+        option :nice, true, ''
+        option :manifest, true, ''
+        option :optipng, { level: 6, interlace: false }, ''
+        option :pack, true, ''
+        option :pngcrush, { chunks: ['alla'], fix: false, brute: false }, ''
+        option :pngout, { copy_chunks: false, strategy: 0 }, ''
+        option :skip_missing_workers, true, ''
+        option :svgo, {}, ''
+        option :threads, true, ''
+        option :verbose, false, ''
+      end
+
       def after_build(builder)
         Middleman::Imageoptim::Optimizer.optimize!(app, builder, options)
       end
@@ -16,9 +35,13 @@ def manipulate_resource_list(resources)
       private
 
       def setup_options(options_hash = {}, &_block)
-        @options = Middleman::Imageoptim::Options.new(options_hash)
-        yield @options if block_given?
-        @options.freeze
+        if Gem::Version.new(Middleman::VERSION) >= Gem::Version.new('4.0.0')
+          super
+        else
+          @options = Middleman::Imageoptim::Options.new(options_hash)
+          yield @options if block_given?
+          @options.freeze
+        end
       end
     end
   end
diff --git a/lib/middleman-imageoptim/optimizer.rb b/lib/middleman-imageoptim/optimizer.rb
index cda579d..52bd750 100644
--- a/lib/middleman-imageoptim/optimizer.rb
+++ b/lib/middleman-imageoptim/optimizer.rb
@@ -96,7 +96,15 @@ def builder_thor
       end
 
       def optimizer
-        @optimizer ||= ImageOptim.new(options.imageoptim_options)
+        @optimizer ||= begin
+          imageoptim_options = if Gem::Version.new(Middleman::VERSION) >= Gem::Version.new('4.0.0')
+                                 options.to_h.except(:image_extensions, :manifest)
+                               else
+                                 options.imageoptim_options
+                               end
+
+          ImageOptim.new(imageoptim_options)
+        end
       end
 
       def manifest
diff --git a/lib/middleman-imageoptim/options.rb b/lib/middleman-imageoptim/options.rb
index c29995a..2d2a83f 100644
--- a/lib/middleman-imageoptim/options.rb
+++ b/lib/middleman-imageoptim/options.rb
@@ -1,53 +1,55 @@
-module Middleman
-  module Imageoptim
-    # An options store that handles default options will accept user defined
-    # overrides
-    class Options
-      # Mapping of valid option names to default values
-      EXTENSION_OPTIONS = [
-        :image_extensions,
-        :manifest
-      ].freeze
-      OPTIONS = {
-        advpng: { level: 4 },
-        allow_lossy: false,
-        gifsicle: { interlace: false },
-        image_extensions: %w(.png .jpg .jpeg .gif .svg),
-        jpegoptim: { strip: ['all'], max_quality: 100 },
-        jpegtran: { copy_chunks: false, progressive: true, jpegrescan: true },
-        nice: true,
-        manifest: true,
-        optipng: { level: 6, interlace: false },
-        pack: true,
-        pngcrush: { chunks: ['alla'], fix: false, brute: false },
-        pngout: { copy_chunks: false, strategy: 0 },
-        skip_missing_workers: true,
-        svgo: {},
-        threads: true,
-        verbose: false
-      }.freeze
+if Gem::Version.new(Middleman::VERSION) < Gem::Version.new('4.0.0')
+  module Middleman
+    module Imageoptim
+      # An options store that handles default options will accept user defined
+      # overrides
+      class Options
+        # Mapping of valid option names to default values
+        EXTENSION_OPTIONS = [
+          :image_extensions,
+          :manifest
+        ].freeze
+        OPTIONS = {
+          advpng: { level: 4 },
+          allow_lossy: false,
+          gifsicle: { interlace: false },
+          image_extensions: %w(.png .jpg .jpeg .gif .svg),
+          jpegoptim: { strip: ['all'], max_quality: 100 },
+          jpegtran: { copy_chunks: false, progressive: true, jpegrescan: true },
+          nice: true,
+          manifest: true,
+          optipng: { level: 6, interlace: false },
+          pack: true,
+          pngcrush: { chunks: ['alla'], fix: false, brute: false },
+          pngout: { copy_chunks: false, strategy: 0 },
+          skip_missing_workers: true,
+          svgo: {},
+          threads: true,
+          verbose: false
+        }.freeze
 
-      attr_accessor *OPTIONS.keys.map(&:to_sym)
+        attr_accessor *OPTIONS.keys.map(&:to_sym)
 
-      def initialize(user_options = {})
-        set_options(user_options)
-      end
+        def initialize(user_options = {})
+          set_options(user_options)
+        end
 
-      def imageoptim_options
-        Hash[instance_variables.map do |name|
-          [symbolize_key(name), instance_variable_get(name)]
-        end].reject { |key| EXTENSION_OPTIONS.include?(key) }
-      end
+        def imageoptim_options
+          Hash[instance_variables.map do |name|
+            [symbolize_key(name), instance_variable_get(name)]
+          end].reject { |key| EXTENSION_OPTIONS.include?(key) }
+        end
 
-      private
+        private
 
-      def symbolize_key(key)
-        key.to_s[1..-1].to_sym
-      end
+        def symbolize_key(key)
+          key.to_s[1..-1].to_sym
+        end
 
-      def set_options(user_options)
-        OPTIONS.keys.each do |name|
-          instance_variable_set(:"@#{name}", user_options.fetch(name, OPTIONS[name]))
+        def set_options(user_options)
+          OPTIONS.keys.each do |name|
+            instance_variable_set(:"@#{name}", user_options.fetch(name, OPTIONS[name]))
+          end
         end
       end
     end
diff --git a/spec/unit/options_spec.rb b/spec/unit/options_spec.rb
index 251dad3..5e92d5b 100644
--- a/spec/unit/options_spec.rb
+++ b/spec/unit/options_spec.rb
@@ -1,126 +1,128 @@
-require 'spec_helper'
-require_relative '../../lib/middleman-imageoptim/options'
+if Gem::Version.new(Middleman::VERSION) < Gem::Version.new('4.0.0')
+  require 'spec_helper'
+  require_relative '../../lib/middleman-imageoptim/options'
 
-describe Middleman::Imageoptim::Options do
-  let(:options_hash) { {} }
-  let(:instance) { described_class.new(options_hash) }
-  subject { instance }
+  describe Middleman::Imageoptim::Options do
+    let(:options_hash) { {} }
+    let(:instance) { described_class.new(options_hash) }
+    subject { instance }
 
-  describe 'default options' do
-    its(:verbose) { should be_falsey }
-    its(:nice) { should be_truthy }
-    its(:threads) { should be_truthy }
-    its(:skip_missing_workers) { should be_truthy }
-    its(:allow_lossy) { should be_falsey }
-    its(:image_extensions) { should == ['.png', '.jpg', '.jpeg', '.gif', '.svg'] }
-    its(:pngcrush) { should == { chunks: ['alla'], fix: false, brute: false } }
-    its(:pngout) { should == { copy_chunks: false, strategy: 0 } }
-    its(:optipng) { should == { level: 6, interlace: false } }
-    its(:advpng) { should == { level: 4 } }
-    its(:jpegoptim) { should == { strip: ['all'], max_quality: 100 } }
-    its(:jpegtran) { should == { copy_chunks: false, progressive: true, jpegrescan: true } }
-    its(:gifsicle) { should == { interlace: false } }
-    its(:svgo) { should == {} }
-  end
+    describe 'default options' do
+      its(:verbose) { should be_falsey }
+      its(:nice) { should be_truthy }
+      its(:threads) { should be_truthy }
+      its(:skip_missing_workers) { should be_truthy }
+      its(:allow_lossy) { should be_falsey }
+      its(:image_extensions) { should == ['.png', '.jpg', '.jpeg', '.gif', '.svg'] }
+      its(:pngcrush) { should == { chunks: ['alla'], fix: false, brute: false } }
+      its(:pngout) { should == { copy_chunks: false, strategy: 0 } }
+      its(:optipng) { should == { level: 6, interlace: false } }
+      its(:advpng) { should == { level: 4 } }
+      its(:jpegoptim) { should == { strip: ['all'], max_quality: 100 } }
+      its(:jpegtran) { should == { copy_chunks: false, progressive: true, jpegrescan: true } }
+      its(:gifsicle) { should == { interlace: false } }
+      its(:svgo) { should == {} }
+    end
 
-  describe 'getting options for imageoptim' do
-    describe '#imageoptim_options' do
-      subject { instance.imageoptim_options }
-      let(:options_hash) do
-        { verbose: true, manifest: false, image_extensions: ['.gif'] }
-      end
-      it do
-        is_expected.to eql(
-          advpng: { level: 4 },
-          allow_lossy: false,
-          gifsicle: { interlace: false },
-          jpegoptim: { strip: ['all'], max_quality: 100 },
-          jpegtran: { copy_chunks: false, progressive: true, jpegrescan: true },
-          nice: true,
-          optipng: { level: 6, interlace: false },
-          pack: true,
-          pngcrush: { chunks: ['alla'], fix: false, brute: false },
-          pngout: { copy_chunks: false, strategy: 0 },
-          skip_missing_workers: true,
-          svgo: {},
-          threads: true,
-          verbose: true
-        )
+    describe 'getting options for imageoptim' do
+      describe '#imageoptim_options' do
+        subject { instance.imageoptim_options }
+        let(:options_hash) do
+          { verbose: true, manifest: false, image_extensions: ['.gif'] }
+        end
+        it do
+          is_expected.to eql(
+            advpng: { level: 4 },
+            allow_lossy: false,
+            gifsicle: { interlace: false },
+            jpegoptim: { strip: ['all'], max_quality: 100 },
+            jpegtran: { copy_chunks: false, progressive: true, jpegrescan: true },
+            nice: true,
+            optipng: { level: 6, interlace: false },
+            pack: true,
+            pngcrush: { chunks: ['alla'], fix: false, brute: false },
+            pngout: { copy_chunks: false, strategy: 0 },
+            skip_missing_workers: true,
+            svgo: {},
+            threads: true,
+            verbose: true
+          )
+        end
       end
     end
-  end
 
-  describe 'with user options' do
-    describe '#verbose' do
-      subject { instance.verbose }
-      let(:options_hash) { { verbose: true } }
-      it { is_expected.to be_truthy }
-    end
+    describe 'with user options' do
+      describe '#verbose' do
+        subject { instance.verbose }
+        let(:options_hash) { { verbose: true } }
+        it { is_expected.to be_truthy }
+      end
 
-    describe '#nice' do
-      subject { instance.nice }
-      let(:options_hash) { { nice: false } }
-      it { is_expected.to be_falsey }
-    end
+      describe '#nice' do
+        subject { instance.nice }
+        let(:options_hash) { { nice: false } }
+        it { is_expected.to be_falsey }
+      end
 
-    describe '#threads' do
-      subject { instance.threads }
-      let(:options_hash) { { threads: false } }
-      it { is_expected.to be_falsey }
-    end
+      describe '#threads' do
+        subject { instance.threads }
+        let(:options_hash) { { threads: false } }
+        it { is_expected.to be_falsey }
+      end
 
-    describe '#image_extensions' do
-      subject { instance.image_extensions }
-      let(:options_hash) { { image_extensions: ['.gif'] } }
-      it { is_expected.to eq(['.gif']) }
-    end
+      describe '#image_extensions' do
+        subject { instance.image_extensions }
+        let(:options_hash) { { image_extensions: ['.gif'] } }
+        it { is_expected.to eq(['.gif']) }
+      end
 
-    describe '#pngcrush_options' do
-      subject { instance.pngcrush }
-      let(:options_hash) { { pngcrush: { foo: 'bar' } } }
-      it { is_expected.to eq(foo: 'bar') }
-    end
+      describe '#pngcrush_options' do
+        subject { instance.pngcrush }
+        let(:options_hash) { { pngcrush: { foo: 'bar' } } }
+        it { is_expected.to eq(foo: 'bar') }
+      end
 
-    describe '#pngout' do
-      subject { instance.pngout }
-      let(:options_hash) { { pngout: { foo: 'bar' } } }
-      it { is_expected.to eq(foo: 'bar') }
-    end
+      describe '#pngout' do
+        subject { instance.pngout }
+        let(:options_hash) { { pngout: { foo: 'bar' } } }
+        it { is_expected.to eq(foo: 'bar') }
+      end
 
-    describe '#optipng' do
-      subject { instance.optipng }
-      let(:options_hash) { { optipng: { foo: 'bar' } } }
-      it { is_expected.to eq(foo: 'bar') }
-    end
+      describe '#optipng' do
+        subject { instance.optipng }
+        let(:options_hash) { { optipng: { foo: 'bar' } } }
+        it { is_expected.to eq(foo: 'bar') }
+      end
 
-    describe '#advpng' do
-      subject { instance.advpng }
-      let(:options_hash) { { advpng: { foo: 'bar' } } }
-      it { is_expected.to eq(foo: 'bar') }
-    end
+      describe '#advpng' do
+        subject { instance.advpng }
+        let(:options_hash) { { advpng: { foo: 'bar' } } }
+        it { is_expected.to eq(foo: 'bar') }
+      end
 
-    describe '#jpegoptim' do
-      subject { instance.jpegoptim }
-      let(:options_hash) { { jpegoptim: { foo: 'bar' } } }
-      it { is_expected.to eq(foo: 'bar') }
-    end
+      describe '#jpegoptim' do
+        subject { instance.jpegoptim }
+        let(:options_hash) { { jpegoptim: { foo: 'bar' } } }
+        it { is_expected.to eq(foo: 'bar') }
+      end
 
-    describe '#jpegtran' do
-      subject { instance.jpegtran }
-      let(:options_hash) { { jpegtran: { foo: 'bar' } } }
-      it { is_expected.to eq(foo: 'bar') }
-    end
+      describe '#jpegtran' do
+        subject { instance.jpegtran }
+        let(:options_hash) { { jpegtran: { foo: 'bar' } } }
+        it { is_expected.to eq(foo: 'bar') }
+      end
 
-    describe '#gifsicle' do
-      subject { instance.gifsicle }
-      let(:options_hash) { { gifsicle: { foo: 'bar' } } }
-      it { is_expected.to eq(foo: 'bar') }
-    end
+      describe '#gifsicle' do
+        subject { instance.gifsicle }
+        let(:options_hash) { { gifsicle: { foo: 'bar' } } }
+        it { is_expected.to eq(foo: 'bar') }
+      end
 
-    describe '#svgo' do
-      subject { instance.svgo }
-      let(:options_hash) { { svgo: { foo: 'bar' } } }
-      it { is_expected.to eq(foo: 'bar') }
+      describe '#svgo' do
+        subject { instance.svgo }
+        let(:options_hash) { { svgo: { foo: 'bar' } } }
+        it { is_expected.to eq(foo: 'bar') }
+      end
     end
   end
 end