diff --git a/app/helpers/filestack_rails/application_helper.rb b/app/helpers/filestack_rails/application_helper.rb
index 6be4472..39bb367 100644
--- a/app/helpers/filestack_rails/application_helper.rb
+++ b/app/helpers/filestack_rails/application_helper.rb
@@ -35,7 +35,7 @@ def filestack_image(url, options = {})
         transform_object.add_external_url url
         image_tag transform_object.fs_url, options
       else
-        image_tag url
+        image_tag url, options
       end
     end
 
diff --git a/filestack-rails.gemspec b/filestack-rails.gemspec
index 39d3c15..89d7fc6 100644
--- a/filestack-rails.gemspec
+++ b/filestack-rails.gemspec
@@ -17,7 +17,7 @@ Gem::Specification.new do |s|
   s.files = Dir["{app,config,db,lib}/**/*", "MIT-LICENSE", "Rakefile", "README.md"]
 
   s.add_dependency 'rails', '>= 4.0'
-  s.add_dependency "filestack", '~> 2.6.0'
+  s.add_dependency "filestack", '~> 2.6.5'
 
   s.add_development_dependency 'coveralls'
   s.add_development_dependency 'sqlite3', '~> 1.3', '>= 1.3.6'
diff --git a/lib/filestack_rails/filestack_js.rb b/lib/filestack_rails/filestack_js.rb
index d2239da..4472a23 100644
--- a/lib/filestack_rails/filestack_js.rb
+++ b/lib/filestack_rails/filestack_js.rb
@@ -6,13 +6,17 @@ def initialize
   end
 
   def filestack_js_url
-    "https://static.filestackapi.com/filestack-js/#{version}/filestack.min.js"
+    "https://static.#{domain}/filestack-js/#{version}/filestack.min.js"
   end
 
   def version
     ::Rails.application.config.filestack_rails.version
   end
 
+  def domain
+    ::Rails.application.config.filestack_rails.cname || 'filestackapi.com'
+  end
+
   def picker(client_name, api_key, options, callback, other_callbacks = nil)
     options_string = options[1..-2] # removed curly brackets help to generate pickerOptions in js
 
diff --git a/spec/helpers/application_helper_spec.rb b/spec/helpers/application_helper_spec.rb
index 8406f4a..4a57fb1 100644
--- a/spec/helpers/application_helper_spec.rb
+++ b/spec/helpers/application_helper_spec.rb
@@ -39,11 +39,17 @@
   end
 
   describe "#filestack_image" do
-    it "returns the correct tag" do
+    it "returns the image tag with transformation" do
       image = filestack_image 'www.example.com', transform: filestack_transform.resize(width: 100, height: 100)
       correct = '<img src="https://cdn.filestackcontent.com/API_KEY/resize=width:100,height:100/www.example.com" />'
       expect(image).to eq(correct)
     end
+
+    it "returns the image tag with attributes" do
+      image = filestack_image 'https://cdn.filestackcontent.com/7Djkxw9TPyEWdjxILnUQ', size: '16x10'
+      correct = '<img src="https://cdn.filestackcontent.com/7Djkxw9TPyEWdjxILnUQ" width="16" height="10" />'
+      expect(image).to eq(correct)
+    end
   end
 
   describe "#get_policy_and_signature" do
diff --git a/spec/lib/filestack_js_spec.rb b/spec/lib/filestack_js_spec.rb
index 4ca8c7c..547a6f5 100644
--- a/spec/lib/filestack_js_spec.rb
+++ b/spec/lib/filestack_js_spec.rb
@@ -59,5 +59,18 @@
         expect(security).to eq({ security: { signature: signature, policy: policy } }.to_json)
       end
     end
+
+    context 'when cname is configured' do
+      before do
+        configuration.cname = 'fs.domain.com'
+        configuration.version = '3.x.x'
+      end
+
+      it 'returns filestack-js url with cname' do
+        expect(get_filestack_js.url).to eq(
+          "https://static.#{configuration.cname}/filestack-js/#{configuration.version}/filestack.min.js"
+        )
+      end
+    end
   end
 end