diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index ecf823b..23fa7b9 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -9,6 +9,7 @@ class ApplicationController < ActionController::Base
   helper_method :fluentd_exists?
   before_action :login_required
   before_action :set_locale
+  before_action :notice_new_fluentd_ui_available
 
   def current_user
     return unless session[:succeed_password]
@@ -50,6 +51,12 @@ class ApplicationController < ActionController::Base
 
   private
 
+  def notice_new_fluentd_ui_available
+    if FluentdUI.update_available?
+      flash[:info] = I18n.t("messages.available_new_fluentd_ui", version: FluentdUI.latest_version, update_url: misc_information_path)
+    end
+  end
+
   def find_fluentd
     @fluentd = Fluentd.instance
   end
diff --git a/app/controllers/misc_controller.rb b/app/controllers/misc_controller.rb
index b405a5e..6a71c33 100644
--- a/app/controllers/misc_controller.rb
+++ b/app/controllers/misc_controller.rb
@@ -9,4 +9,24 @@ class MiscController < ApplicationController
     @env = ENV
     @plugins = Plugin.installed
   end
+
+  def update_fluentd_ui
+    FluentdUiRestart.new.async.perform
+    @current_pid = $$
+    render "update_fluentd_ui", layout: "sign_in"
+  end
+
+  def upgrading_status
+    if FluentdUiRestart::LOCK.present?
+      return render text: "updating"
+    end
+
+    if $$.to_s == params[:old_pid]
+      # restarting fluentd-ui is finished, but PID doesn't changed.
+      # maybe error occured at FluentdUiRestart#perform
+      render text: "failed"
+    else
+      render text: "finished"
+    end
+  end
 end
diff --git a/app/models/plugin.rb b/app/models/plugin.rb
index 0d257ad..9da967c 100644
--- a/app/models/plugin.rb
+++ b/app/models/plugin.rb
@@ -22,6 +22,8 @@ class Plugin
 
     self.version ||= latest_version
     if valid? && gem_install
+      # NOTE: also updating fluentd-ui gem is used this method, that shouldn't be recorded
+      return true unless gem_name.start_with?("fluent-plugin-")
       File.open(gemfile_path, "a") do |f|
         f.puts format_gemfile
       end
diff --git a/app/views/layouts/sign_in.html.erb b/app/views/layouts/sign_in.html.erb
index cb304a3..23e537d 100644
--- a/app/views/layouts/sign_in.html.erb
+++ b/app/views/layouts/sign_in.html.erb
@@ -18,14 +18,7 @@
      <div class="container">
         <div class="row">
             <div class="col-md-4 col-md-offset-4">
-                <div class="login-panel panel panel-default">
-                    <div class="panel-heading">
-                        <h3 class="panel-title"><%= t('messages.please_sign_in') %></h3>
-                    </div>
-                    <div class="panel-body">
-                      <%= yield %>
-                    </div>
-                </div>
+              <%= yield %>
             </div>
         </div>
     </div>
diff --git a/app/views/misc/information.html.haml b/app/views/misc/information.html.haml
index cee12d7..2f07f1a 100644
--- a/app/views/misc/information.html.haml
+++ b/app/views/misc/information.html.haml
@@ -1,55 +1,64 @@
 - page_title t('.page_title')
 
-%div.col-lg-6
-  %div.panel.panel-info
-    %div.panel-heading
-      %h4= t ".version"
-    %div.panel-body
-      %dl{class: "dl-horizontal"}
-        %dt ruby
-        %dd= RUBY_DESCRIPTION
-        %dt fluentd
-        %dd= Fluent::VERSION
-        %dt fluentd-ui
-        %dd= FluentdUI::VERSION
+- if FluentdUI.update_available?
+  .row
+    .col-lg-12
+      %p
+        = link_to misc_update_fluentd_ui_path, class: "btn btn-primary btn-lg", method: :post do
+          = t('.update_fluentd_ui', version: FluentdUI.latest_version)
+        = t('.update_fluentd_ui_caution')
 
+.row
+  %div.col-lg-6
+    %div.panel.panel-default
+      %div.panel-heading
+        %h4= t ".version"
+      %div.panel-body
+        %dl{class: "dl-horizontal"}
+          %dt ruby
+          %dd= RUBY_DESCRIPTION
+          %dt fluentd
+          %dd= Fluent::VERSION
+          %dt fluentd-ui
+          %dd= FluentdUI::VERSION
 
-%div.col-lg-6
-  %div.panel.panel-default
-    %div.panel-heading
-      %h4= t('.installed_plugins')
-    %div.panel-body
-      - if @plugins.present?
-        %table{class: "table table-hover", id: "plugins-table"}
-          %thead
-            %tr
-              %th= t('plugins.common.name')
-              %th= t('plugins.common.version')
-          %tbody
-            - @plugins.each do |plugin|
+  %div.col-lg-6
+    %div.panel.panel-default
+      %div.panel-heading
+        %h4= t('.installed_plugins')
+      %div.panel-body
+        - if @plugins.present?
+          %table{class: "table table-hover", id: "plugins-table"}
+            %thead
               %tr
-                %td= plugin.gem_name
-                %td= plugin.installed_version
-      - else
-        = t "plugins.common.no_installed"
+                %th= t('plugins.common.name')
+                %th= t('plugins.common.version')
+            %tbody
+              - @plugins.each do |plugin|
+                %tr
+                  %td= plugin.gem_name
+                  %td= plugin.installed_version
+        - else
+          = t "plugins.common.no_installed"
 
-%div.col-lg-12
-  %div.panel.panel-default
-    %div.panel-heading
-      %h4
-        %a{"data-toggle" => "collapse", "href" => "#env-table"}
-          = icon('fa-caret-down')
-        = t('.env')
-    %table{class: "table table-hover collapse", id: "env-table"}
-      %thead
-        %tr
-          %th= t('.env_key')
-          %th= t('.env_value')
-      %tbody
-        - @env.each_pair do |key, value|
+.row
+  %div.col-lg-12
+    %div.panel.panel-default
+      %div.panel-heading
+        %h4
+          %a{"data-toggle" => "collapse", "href" => "#env-table"}
+            = icon('fa-caret-down')
+          = t('.env')
+      %table{class: "table table-hover collapse", id: "env-table"}
+        %thead
           %tr
-            %td= key
-            %td= value
+            %th= t('.env_key')
+            %th= t('.env_value')
+        %tbody
+          - @env.each_pair do |key, value|
+            %tr
+              %td= key
+              %td= value
 
 :javascript
   $(document).ready(function() {
diff --git a/app/views/misc/update_fluentd_ui.html.haml b/app/views/misc/update_fluentd_ui.html.haml
new file mode 100644
index 0000000..4d345bb
--- /dev/null
+++ b/app/views/misc/update_fluentd_ui.html.haml
@@ -0,0 +1,45 @@
+.panel.panel-default
+  .panel-heading
+    = t('.update_title')
+  .panel-body
+    #processing
+      = icon('fa-lg fa-gear fa-spin')
+      = t('.updating')
+    #finished{style: "display: none"}
+      = icon('fa-lg fa-check')
+      = t('.update_finish')
+      %p= link_to t('misc.information.page_title'), misc_information_path
+    #failed{style: "display: none"}
+      = icon('fa-lg fa-exclamation-circle')
+      = t('.failed')
+      %p= link_to t('misc.information.page_title'), misc_information_path
+
+:javascript
+  var CURRENT_PID = "#{@current_pid}";
+
+  function ping() {
+    setTimeout(function(){
+      jQuery.ajax({
+        url: "#{misc_upgrading_status_path}",
+        type: "GET",
+        data: { old_pid: CURRENT_PID }
+      })
+      .fail(ping)
+      .done(function(status){
+        switch(status) {
+        case "updating":
+          ping();
+          break;
+        case "failed":
+          jQuery('#processing').hide();
+          jQuery('#failed').show();
+          break;
+        case "finished":
+          jQuery('#processing').hide();
+          jQuery('#finished').show();
+          break;
+        }
+      });
+    }, 3000);
+  }
+  ping();
diff --git a/app/views/sessions/new.html.haml b/app/views/sessions/new.html.haml
index bae46db..5fbf579 100644
--- a/app/views/sessions/new.html.haml
+++ b/app/views/sessions/new.html.haml
@@ -1,8 +1,13 @@
-= render partial: "shared/error"
-= form_for(:session, url: sessions_path) do |f|
-  %div.form-group
-    = f.text_field :name, placeholder: "Name"
-  %div.form-group
-    = f.password_field :password, placeholder: "Password"
-    
-  = submit_tag t("terms.sign_in"), class: "btn btn-success"
+.login-panel.panel.panel-default
+  .panel-heading
+    %h3.panel-title
+      = t('messages.please_sign_in')
+  .panel-body
+    = render partial: "shared/error"
+    = form_for(:session, url: sessions_path) do |f|
+      %div.form-group
+        = f.text_field :name, placeholder: "Name"
+      %div.form-group
+        = f.password_field :password, placeholder: "Password"
+
+      = submit_tag t("terms.sign_in"), class: "btn btn-success"
diff --git a/app/views/shared/_flash.html.haml b/app/views/shared/_flash.html.haml
index c430717..3da9db9 100644
--- a/app/views/shared/_flash.html.haml
+++ b/app/views/shared/_flash.html.haml
@@ -5,4 +5,6 @@
   - if flash[:success]
     %p.alert.alert-success
       =raw flash[:success]
-
+  - if flash[:info]
+    %p.alert.alert-info
+      =raw flash[:info]
diff --git a/app/workers/fluentd_ui_restart.rb b/app/workers/fluentd_ui_restart.rb
new file mode 100644
index 0000000..5ce7258
--- /dev/null
+++ b/app/workers/fluentd_ui_restart.rb
@@ -0,0 +1,38 @@
+class FluentdUiRestart
+  include SuckerPunch::Job
+
+  LOCK = []
+
+  def lock!
+    raise "update process is still running" if LOCK.present?
+    LOCK << true
+  end
+
+  def unlock!
+    LOCK.shift
+  end
+
+  def perform
+    lock!
+    sleep 5 # delay for render updating HTML
+
+    # NOTE: install will be failed before released fluentd-ui gem
+    SuckerPunch.logger.info "[restart] install new fluentd-ui"
+    Plugin.new(gem_name: "fluentd-ui").install!
+
+    if Rails.env.production?
+      cmd = %W(#{Rails.root}/bin/fluentd-ui start)
+    else
+      cmd = %W(bundle exec rails s)
+    end
+
+    SuckerPunch.logger.info "[restart] will restart"
+    Bundler.with_clean_env do
+      restarter = "#{Rails.root}/bin/fluentd-ui-restart"
+      Process.spawn(*[restarter, $$.to_s, *cmd, *ARGV]) && Process.kill(:TERM, $$)
+    end
+  ensure
+    # don't reach here if restart is successful
+    unlock!
+  end
+end
diff --git a/app/workers/fluentd_ui_update_check.rb b/app/workers/fluentd_ui_update_check.rb
new file mode 100644
index 0000000..633e6c9
--- /dev/null
+++ b/app/workers/fluentd_ui_update_check.rb
@@ -0,0 +1,15 @@
+class FluentdUiUpdateCheck
+  include SuckerPunch::Job
+
+  def perform
+    pl = Plugin.new(gem_name: "fluentd-ui")
+    if pl.gem_versions # NOTE: fluentd-ui is not released yet, so `pl.latest_version` will fail for now
+      FluentdUI.latest_version = pl.latest_version
+    end
+    later(3600) # will be checked every hour
+  end
+
+  def later(sec)
+    after(sec) { perform }
+  end
+end
diff --git a/bin/fluentd-ui-restart b/bin/fluentd-ui-restart
new file mode 100755
index 0000000..3b25c45
--- /dev/null
+++ b/bin/fluentd-ui-restart
@@ -0,0 +1,12 @@
+#!/usr/bin/env ruby
+
+pid = ARGV.shift
+begin
+  loop do
+    # wait old fluentd-ui process shutdown
+    Process.kill(0, pid.to_i)
+    sleep 0.1
+  end
+rescue Errno::ESRCH
+  exec(*ARGV)
+end
diff --git a/config/application.rb b/config/application.rb
index b0c8fef..549f741 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -38,5 +38,7 @@ module FluentdUi
     #       If AR will be used, please comment in and check timezone.
     # config.active_record.default_timezone = :local
     # config.time_zone =
+
+    require Rails.root.join("lib", "fluentd-ui")
   end
 end
diff --git a/config/locales/translation_en.yml b/config/locales/translation_en.yml
index 6d6d76f..535e49d 100644
--- a/config/locales/translation_en.yml
+++ b/config/locales/translation_en.yml
@@ -3,6 +3,7 @@ en:
     need_restart: need to restart fluentd-ui
     please_sign_in: Sign in
     destroy_succeed_fluentd_setting: Deleted fluentd setting
+    available_new_fluentd_ui: 'fluentd-ui %{version} is available. <a href="%{update_url}">Go to system information page</a>'
 
   terms: &terms
     sign_in: Sign in
@@ -186,6 +187,14 @@ en:
       env_key: Key
       env_value: Value
       page_title: System Information
+      update_fluentd_ui: Update fluentd-ui
+      update_fluentd_ui_caution: "Note: fluentd will not restart"
+    update_fluentd_ui:
+      <<: *misc_common
+      update_title: Updating fluentd-ui
+      updating: Updating..
+      update_finish: Update finished!
+      failed: Failed to update. Please see fluentd-ui log
 
   tutorials:
     common: &tutorials_common
diff --git a/config/locales/translation_ja.yml b/config/locales/translation_ja.yml
index 8bcc69e..2f5b4a7 100644
--- a/config/locales/translation_ja.yml
+++ b/config/locales/translation_ja.yml
@@ -3,6 +3,7 @@ ja:
     need_restart: fluentd-uiの再起動が必要です
     please_sign_in: ログイン
     destroy_succeed_fluentd_setting: fluentdの設定を削除しました
+    available_new_fluentd_ui: 'fluentd-ui %{version}にアップデートできます。<a href="%{update_url}">システム情報ページへ</a>'
 
   terms: &terms
     sign_in: ログイン
@@ -182,6 +183,14 @@ ja:
       env_key: キー
       env_value: 値
       page_title: システム情報
+      update_fluentd_ui: fluentd-uiを更新
+      update_fluentd_ui_caution: ※fluentdは再起動されません
+    update_fluentd_ui:
+      <<: *misc_common
+      update_title: fluentd-ui 更新
+      updating: 更新中
+      update_finish: 更新が完了しました
+      failed: 更新に失敗しました。fluentd-uiのログをご確認ください
 
   tutorials:
     common: &tutorials_common
diff --git a/config/routes.rb b/config/routes.rb
index 39a586d..da70d3f 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -37,6 +37,8 @@ Rails.application.routes.draw do
 
   get "misc" => "misc#show"
   get "misc/information"
+  post "misc/update_fluentd_ui"
+  get "misc/upgrading_status"
 
   namespace :polling do
     get "alerts"
diff --git a/lib/fluentd-ui.rb b/lib/fluentd-ui.rb
index ead308a..b4e001f 100644
--- a/lib/fluentd-ui.rb
+++ b/lib/fluentd-ui.rb
@@ -1,2 +1,16 @@
 module FluentdUI
+  def self.latest_version=(version)
+    @latest = version
+  end
+
+  def self.latest_version
+    @latest
+  end
+
+  def self.update_available?
+    return unless @latest
+    latest = Gem::Version.new(@latest)
+    current = Gem::Version.new(::FluentdUI::VERSION)
+    latest > current
+  end
 end