diff --git a/app/models/rate.rb b/app/models/rate.rb
index 70504a9..f8b0354 100644
--- a/app/models/rate.rb
+++ b/app/models/rate.rb
@@ -8,36 +8,36 @@ class Rate < ActiveRecord::Base
   belongs_to :project
   belongs_to :user
   has_many :time_entries
-  
+
   validates_presence_of :user_id
   validates_presence_of :date_in_effect
   validates_numericality_of :amount
-  
+
   before_save :unlocked?
   after_save :update_time_entry_cost_cache
   before_destroy :unlocked?
   after_destroy :update_time_entry_cost_cache
-  
-  named_scope :history_for_user, lambda { |user, order|
+
+  scope :history_for_user, lambda { |user, order|
     {
       :conditions => { :user_id => user.id },
       :order => order,
       :include => :project
     }
   }
-  
+
   def locked?
     return self.time_entries.length > 0
   end
-  
+
   def unlocked?
     return !self.locked?
   end
-  
+
   def default?
     return self.project.nil?
   end
-  
+
   def specific?
     return !self.default?
   end
@@ -45,7 +45,7 @@ class Rate < ActiveRecord::Base
   def update_time_entry_cost_cache
     TimeEntry.update_cost_cache(user, project)
   end
-  
+
   # API to find the Rate for a +user+ on a +project+ at a +date+
   def self.for(user, project = nil, date = Date.today.to_s)
     # Check input since it's a "public" API
@@ -56,13 +56,13 @@ class Rate < ActiveRecord::Base
     end
     raise Rate::InvalidParameterException.new("project must be a Project instance") unless project.nil? || project.is_a?(Project)
     Rate.check_date_string(date)
-      
+
     rate = self.for_user_project_and_date(user, project, date)
     # Check for a default (non-project) rate
     rate = self.default_for_user_and_date(user, date) if rate.nil? && project
     rate
   end
-  
+
   # API to find the amount for a +user+ on a +project+ at a +date+
   def self.amount_for(user, project = nil, date = Date.today.to_s)
     rate = self.for(user, project, date)
@@ -96,7 +96,7 @@ class Rate < ActiveRecord::Base
     end
     store_cache_timestamp('last_cache_clearing_run', Time.now.utc.to_s)
   end
-  
+
   private
   def self.for_user_project_and_date(user, project, date)
     if project.nil?
@@ -107,7 +107,7 @@ class Rate < ActiveRecord::Base
                                        user.id,
                                        date
                                       ])
-    
+
     else
       return Rate.find(:first,
                        :order => 'date_in_effect DESC',
@@ -117,9 +117,9 @@ class Rate < ActiveRecord::Base
                                        project.id,
                                        date
                                       ])
-    end                     
+    end
   end
-  
+
   def self.default_for_user_and_date(user, date)
     self.for_user_project_and_date(user, nil, date)
   end
@@ -128,7 +128,7 @@ class Rate < ActiveRecord::Base
   # a Rate::InvalidParameterException otherwise
   def self.check_date_string(date)
     raise Rate::InvalidParameterException.new("date must be a valid Date string (e.g. YYYY-MM-DD)") unless date.is_a?(String)
-    
+
     begin
       Date.parse(date)
     rescue ArgumentError
@@ -144,7 +144,7 @@ class Rate < ActiveRecord::Base
     # Wait 1 second after stealing a forced lock
     options = {:retries => 0, :suspend => 1}
     options[:max_age] = 1 if force
-    
+
     Lockfile(lock_file, options) do
       block.call
     end
diff --git a/config/routes.rb b/config/routes.rb
index 93bd22b..5485a2a 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,4 +1,4 @@
-ActionController::Routing::Routes.draw do |map|
-  map.resources :rates
-  map.connect 'rate_caches', :conditions => {:method => :put}, :controller => 'rate_caches', :action => 'update'
-end
+resources :rates
+
+match 'rate_caches', :to => 'rate_caches#index', :via => "get"
+match 'rate_caches', :to => 'rate_caches#update', :via => "put"
diff --git a/init.rb b/init.rb
index da7bda4..8f9365a 100644
--- a/init.rb
+++ b/init.rb
@@ -1,9 +1,7 @@
 require 'redmine'
 
 # Patches to the Redmine core
-require 'dispatcher'
-
-Dispatcher.to_prepare :redmine_rate do
+ActionDispatch::Callbacks.to_prepare do
   gem 'lockfile'
 
   require_dependency 'application_controller'
diff --git a/lib/rate_project_hook.rb b/lib/rate_project_hook.rb
index 0819d1f..21ebd48 100644
--- a/lib/rate_project_hook.rb
+++ b/lib/rate_project_hook.rb
@@ -1,10 +1,10 @@
 # Hooks to attach to the Redmine Projects.
 class RateProjectHook < Redmine::Hook::ViewListener
-  
+
   def protect_against_forgery?
     false
   end
-  
+
   # Renders an additional table header to the membership setting
   #
   # Context:
@@ -14,7 +14,7 @@ class RateProjectHook < Redmine::Hook::ViewListener
     return '' unless (User.current.allowed_to?(:view_rate, context[:project]) || User.current.admin?)
     return "<th>#{l(:rate_label_rate)} #{l(:rate_label_currency)}</td>"
   end
-  
+
   # Renders an AJAX from to update the member's billing rate
   #
   # Context:
@@ -37,7 +37,7 @@ class RateProjectHook < Redmine::Hook::ViewListener
     end
 
     content = ''
-    
+
     if rate.nil? || rate.default?
       if rate && rate.default?
         content << "<em>#{number_to_currency(rate.amount)}</em> "
@@ -52,30 +52,22 @@ class RateProjectHook < Redmine::Hook::ViewListener
         :protocol => Setting.protocol,
         :host => Setting.host_name
       }
-      # Build a form_remote_tag by hand since this isn't in the scope of a controller
-      # and url_rewriter doesn't like that fact.
-      form = form_tag(url, :onsubmit => remote_function(:url => url,
-                                                        :host => Setting.host_name,
-                                                        :protocol => Setting.protocol,
-                                                        :form => true,
-                                                        :method => 'post',
-                                                        :return => 'false' )+ '; return false;')
-      
+      form = form_tag(url, :remote => true)
       form << text_field(:rate, :amount)
       form << hidden_field(:rate,:date_in_effect, :value => Date.today.to_s)
       form << hidden_field(:rate, :project_id, :value => project.id)
-      form << hidden_field(:rate, :user_id, :value => member.user.id) 
+      form << hidden_field(:rate, :user_id, :value => member.user.id)
       form << hidden_field_tag("back_url", url_for(:controller => 'projects', :action => 'settings', :id => project, :tab => 'members', :protocol => Setting.protocol, :host => Setting.host_name))
 
       form << submit_tag(l(:rate_label_set_rate), :class => "small")
       form << "</form>"
-        
+
       content << form
       end
     else
       if (User.current.admin?)
 
-      content << content_tag(:strong, link_to(number_to_currency(rate.amount), { 
+      content << content_tag(:strong, link_to(number_to_currency(rate.amount), {
                                                 :controller => 'users',
                                                 :action => 'edit',
                                                 :id => member.user,
diff --git a/lib/redmine_rate/hooks/view_layouts_base_html_head_hook.rb b/lib/redmine_rate/hooks/view_layouts_base_html_head_hook.rb
index 8361aec..87da5f3 100644
--- a/lib/redmine_rate/hooks/view_layouts_base_html_head_hook.rb
+++ b/lib/redmine_rate/hooks/view_layouts_base_html_head_hook.rb
@@ -2,7 +2,7 @@ module RedmineRate
   module Hooks
     class ViewLayoutsBaseHtmlHeadHook < Redmine::Hook::ViewListener
       def view_layouts_base_html_head(context={})
-        return content_tag(:style, "#admin-menu a.rate-caches { background-image: url('#{image_path('database_refresh.png', :plugin => 'redmine_rate')}'); }", :type => 'text/css')
+        content_tag(:style, "#admin-menu a.rate-caches { background-image: url('#{image_path('database_refresh.png')}'); }", :type => 'text/css')
       end
     end
   end