diff --git a/lib/spreedly/environment.rb b/lib/spreedly/environment.rb
index 5021b58..2b78b9f 100644
--- a/lib/spreedly/environment.rb
+++ b/lib/spreedly/environment.rb
@@ -142,6 +142,13 @@ def add_gateway(gateway_type, credentials = {})
       Gateway.new(xml_doc)
     end
 
+    def update_gateway(gateway_token, credentials: {}, options: {})
+      body = update_gateway_body(credentials: credentials, options: options)
+      puts body
+      xml_doc = ssl_put(update_gateway_url(gateway_token), body, headers)
+      Gateway.new(xml_doc)
+    end
+
     def add_receiver(receiver_type, host_names = nil, credentials = [])
       body = add_receiver_body(receiver_type, host_names, credentials)
       xml_doc = ssl_post(add_receiver_url, body, headers)
@@ -252,6 +259,13 @@ def add_gateway_body(gateway_type, credentials)
       end
     end
 
+    def update_gateway_body(credentials: {}, options: {})
+      build_xml_request('gateway') do |doc|
+        add_to_doc(doc, credentials, *credentials.keys)
+        add_to_doc(doc, options, :description, :merchant_profile_key, :sub_merchant_key)
+      end
+    end
+
     def add_receiver_body(receiver_type, host_names, credentials)
       build_xml_request('receiver') do |doc|
         doc.receiver_type receiver_type
diff --git a/lib/spreedly/gateway.rb b/lib/spreedly/gateway.rb
index b8d2238..99047fb 100644
--- a/lib/spreedly/gateway.rb
+++ b/lib/spreedly/gateway.rb
@@ -3,7 +3,7 @@ module Spreedly
 
   class Gateway < Model
 
-    field :gateway_type, :state, :name
+    field :gateway_type, :state, :name, :description
     attr_reader :credentials
 
     def initialize(xml_doc)
diff --git a/lib/spreedly/urls.rb b/lib/spreedly/urls.rb
index 746396d..6568585 100644
--- a/lib/spreedly/urls.rb
+++ b/lib/spreedly/urls.rb
@@ -98,6 +98,10 @@ def add_gateway_url
       "#{base_url}/v1/gateways.xml"
     end
 
+    def update_gateway_url(gateway_token)
+      "#{base_url}/v1/gateways/#{gateway_token}.xml"
+    end
+
     def receiver_options_url
       "#{base_url}/v1/receivers_options.xml"
     end