diff --git a/package.json b/package.json
index 32095fc07..dc63399f9 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
     "name": "4chan X Beta",
     "repo": "https://github.com/MayhemYDG/4chan-x/",
     "page": "https://4chan-x.just-believe.in/",
+    "buildsPath": "builds/",
     "mainBranch": "v3",
     "matches": [
       "*://api.4chan.org/*",
diff --git a/src/features.coffee b/src/features.coffee
index 4549e58ca..e4ffc5d31 100644
--- a/src/features.coffee
+++ b/src/features.coffee
@@ -210,9 +210,10 @@ Settings =
       order: 110
       open: -> Conf['Enable 4chan\'s Extension']
 
-    unless $.get 'previousversion'
+    if (prevVersion = $.get 'previousversion', null) isnt g.VERSION
+      $.set 'lastupdate', Date.now()
       $.set 'previousversion', g.VERSION
-      $.on d, '4chanXInitFinished', Settings.open
+      $.on d, '4chanXInitFinished', Settings.open unless prevVersion
 
     Settings.addSection 'Main',     Settings.main
     Settings.addSection 'Filter',   Settings.filter
diff --git a/src/main.coffee b/src/main.coffee
index d6639bce2..317c7e7af 100644
--- a/src/main.coffee
+++ b/src/main.coffee
@@ -457,6 +457,7 @@ Main =
       Main.callbackNodes Post, posts
 
     $.event '4chanXInitFinished'
+    Main.checkUpdate()
 
   callbackNodes: (klass, nodes) ->
     # get the nodes' length only once
@@ -480,13 +481,39 @@ Main =
     obj = e.detail
     unless typeof obj.callback.name is 'string'
       throw new Error "Invalid callback name: #{obj.callback.name}"
-    Klass = if obj.type is 'Post'
-      Post
-    else
-      Thread
+    switch obj.type
+      when 'Post'
+        Klass = Post
+      when 'Thread'
+        Klass = Thread
+      else
+        return
     obj.callback.isAddon = true
     Klass::callbacks.push obj.callback
 
+  checkUpdate: ->
+    return unless Main.isThisPageLegit()
+    # Check for updates after:
+    #  - 6 hours since the last update on Opera because it lacks auto-updating.
+    #  - 7 days since the last update on Chrome/Firefox.
+    # After that, check for updates every day if we still haven't updated.
+    now  = Date.now()
+    freq = <% if (type === 'userjs') { %>6 * $.HOUR<% } else { %>7 * $.DAY<% } %>
+    if $.get('lastupdate', 0) > now - freq and $.get('lastchecked') > now - $.DAY
+      return
+    $.ajax '<%= meta.page %><%= meta.buildsPath %>version', onload: ->
+      return unless @status is 200
+      version = @response
+      return unless /^\d\.\d+\.\d+$/.test version
+      if g.VERSION is version
+        # Don't check for updates too frequently if there wasn't one in a 'long' time.
+        $.set 'lastupdate', now
+        return
+      $.set 'lastchecked', now
+      el = $.el 'span',
+        innerHTML: "Update: <%= meta.name %> v#{version} is out, get it <a href=<%= meta.page %> target=_blank>here</a>."
+      new Notification 'info', el, 2 * $.MINUTE
+
   handleErrors: (errors) ->
     unless 'length' of errors
       error = errors
diff --git a/src/metadata.js b/src/metadata.js
index 810a371bc..62ffec242 100644
--- a/src/metadata.js
+++ b/src/metadata.js
@@ -16,7 +16,7 @@
 // @grant        GM_deleteValue
 // @grant        GM_openInTab
 // @run-at       document-start
-// @updateURL    <%= meta.page %>builds/<%= name %>.meta.js
-// @downloadURL  <%= meta.page %>builds/<%= name %>.user.js
+// @updateURL    <%= meta.page %><%= meta.buildsPath %><%= name %>.meta.js
+// @downloadURL  <%= meta.page %><%= meta.buildsPath %><%= name %>.user.js
 // @icon         data:image/png;base64,<%= grunt.file.read('img/icon48.png', {encoding: 'base64'}) %>
 // ==/UserScript==