diff --git a/lib/fog/openstack/models/network/subnet.rb b/lib/fog/openstack/models/network/subnet.rb
index 5bf52db77..29dab7b54 100644
--- a/lib/fog/openstack/models/network/subnet.rb
+++ b/lib/fog/openstack/models/network/subnet.rb
@@ -27,7 +27,7 @@ module Fog
         end
 
         def update
-          requires :id, :network_id, :cidr, :ip_version
+          requires :id
           merge_attributes(service.update_subnet(self.id,
                                                     self.attributes).body['subnet'])
           self
diff --git a/lib/fog/openstack/requests/network/create_subnet.rb b/lib/fog/openstack/requests/network/create_subnet.rb
index db52ae3fd..aad7cef07 100644
--- a/lib/fog/openstack/requests/network/create_subnet.rb
+++ b/lib/fog/openstack/requests/network/create_subnet.rb
@@ -14,7 +14,7 @@ module Fog
           vanilla_options = [:name, :gateway_ip, :allocation_pools,
                              :dns_nameservers, :host_routes, :enable_dhcp,
                              :tenant_id]
-          vanilla_options.reject{ |o| options[o].nil? unless o == :gateway_ip }.each do |key|
+          vanilla_options.select{ |o| options.key?(o) }.each do |key|
             data['subnet'][key] = options[key]
           end
 
diff --git a/lib/fog/openstack/requests/network/update_subnet.rb b/lib/fog/openstack/requests/network/update_subnet.rb
index 34a765188..d0e0a9c46 100644
--- a/lib/fog/openstack/requests/network/update_subnet.rb
+++ b/lib/fog/openstack/requests/network/update_subnet.rb
@@ -5,8 +5,8 @@ module Fog
         def update_subnet(subnet_id, options = {})
           data = { 'subnet' => {} }
 
-          vanilla_options = [:name, :gateway_ip, :dns_nameservers,
-                             :host_routes, :enable_dhcp]
+          vanilla_options = [:name, :gateway_ip, :allocation_pools,
+                             :dns_nameservers, :host_routes, :enable_dhcp]
           vanilla_options.select{ |o| options.key?(o) }.each do |key|
             data['subnet'][key] = options[key]
           end
@@ -24,11 +24,12 @@ module Fog
         def update_subnet(subnet_id, options = {})
           response = Excon::Response.new
           if subnet = list_subnets.body['subnets'].find { |_| _['id'] == subnet_id }
-            subnet['name']            = options[:name]
-            subnet['gateway_ip']      = options[:gateway_ip]
-            subnet['dns_nameservers'] = options[:dns_nameservers]
-            subnet['host_routes']     = options[:host_routes]
-            subnet['enable_dhcp']     = options[:enable_dhcp]
+            subnet['name']              = options[:name]
+            subnet['gateway_ip']        = options[:gateway_ip]
+            subnet['dns_nameservers']   = options[:dns_nameservers]
+            subnet['host_routes']       = options[:host_routes]
+            subnet['allocation_pools']  = options[:allocation_pools]
+            subnet['enable_dhcp']       = options[:enable_dhcp]
             response.body = { 'subnet' => subnet }
             response.status = 200
             response