diff --git a/assets/javascripts/templates/pages/about_tmpl.coffee b/assets/javascripts/templates/pages/about_tmpl.coffee
index 1139b2a6..f8e51fed 100644
--- a/assets/javascripts/templates/pages/about_tmpl.coffee
+++ b/assets/javascripts/templates/pages/about_tmpl.coffee
@@ -388,9 +388,9 @@ credits = [
     'https://raw.githubusercontent.com/Homebrew/brew/master/LICENSE.txt'
   ], [
     'Immutable.js',
-    '2014-2016 Facebook, Inc.',
+    '2014–present Lee Byron and other contributors',
     'BSD',
-    'https://raw.githubusercontent.com/facebook/immutable-js/master/LICENSE'
+    'https://github.com/immutable-js/immutable-js/blob/main/LICENSE'
   ], [
     'InfluxData',
     '2015 InfluxData, Inc.',
diff --git a/lib/docs/filters/immutable/clean_html.rb b/lib/docs/filters/immutable/clean_html.rb
index b1e29e60..00f1f63f 100644
--- a/lib/docs/filters/immutable/clean_html.rb
+++ b/lib/docs/filters/immutable/clean_html.rb
@@ -2,6 +2,9 @@ module Docs
   class Immutable
     class CleanHtmlFilter < Filter
       def call
+        @doc = at_css('div')
+        css('#algolia-autocomplete', '#algolia-docsearch').remove
+
         css('section', 'span', 'div[data-reactid]').each do |node|
           node.before(node.children).remove
         end
@@ -9,36 +12,11 @@ module Docs
         css('.codeBlock').each do |node|
           node.name = 'pre'
           node.content = node.content
-          node['data-language'] = 'js'
+          node['data-language'] = 'ts'
         end
 
         css('*[data-reactid]').remove_attr('data-reactid')
         css('a[target]').remove_attr('target')
-
-        css('a[href^="#"]').each do |node|
-          node['href'] = node['href'].sub(/\A#\//, '#').gsub('/', '.').downcase
-        end
-
-        type = type_id = nil
-        css('*').each do |node|
-          if node.name == 'h1'
-            node['id'] = type_id = node.content.strip.downcase
-            type = node.content.strip
-          elsif node.name == 'h3'
-            node['id'] = node.content.strip.downcase
-            node['id'] = node['id'].remove('()') unless node['id'] == "#{type_id}()"
-
-            unless node['id'].start_with?(type_id)
-              node.content = "#{type}##{node.content}"
-              node['id'] = "#{type_id}.#{node['id']}" unless node['id'].start_with?("#{type_id}.")
-            end
-          end
-        end
-
-        css('h4.groupTitle').each do |node|
-          node.name = 'h2'
-        end
-
         css('*[class]').remove_attr('class')
 
         doc
diff --git a/lib/docs/filters/immutable/entries.rb b/lib/docs/filters/immutable/entries.rb
index 0ef05a75..27dd3891 100644
--- a/lib/docs/filters/immutable/entries.rb
+++ b/lib/docs/filters/immutable/entries.rb
@@ -1,21 +1,24 @@
 module Docs
   class Immutable
     class EntriesFilter < Docs::EntriesFilter
+      def get_name
+        at_css('h1').content
+      end
+
+      def get_type
+        return 'Util' if slug.match?(/^([a-z]|Range|Repeat)/)
+        at_css('h1').content
+      end
+
       def additional_entries
+        return [] if root_page?
         entries = []
-        type = nil
-
-        css('*').each do |node|
-          if node.name == 'h1'
-            name = node.content
-            type = node.content.split('.').first
-            entries << [name, node['id'], type]
-          elsif node.name == 'h3'
-            name = node.content
-            entries << [name, node['id'], type]
-          end
+        css('h2, h3, h4').each do |node|
+          name = node.content
+          id = node.parent['id']
+          next unless id
+          entries << ["#{type}.#{name}", id, type]
         end
-
         entries
       end
     end
diff --git a/lib/docs/scrapers/immutable.rb b/lib/docs/scrapers/immutable.rb
index 8b1b47a2..1768ac66 100644
--- a/lib/docs/scrapers/immutable.rb
+++ b/lib/docs/scrapers/immutable.rb
@@ -3,58 +3,31 @@ module Docs
     self.name = 'Immutable.js'
     self.slug = 'immutable'
     self.type = 'simple'
-    self.release = '3.8.1'
-    self.base_url = 'https://facebook.github.io/immutable-js/docs/'
+    self.release = '4.0.0'
+    self.base_url = 'https://immutable-js.com/docs/v4.0.0/'
     self.links = {
-      home: 'https://facebook.github.io/immutable-js/',
+      home: 'https://immutable-js.com/',
       code: 'https://github.com/facebook/immutable-js'
     }
 
-    html_filters.push 'immutable/clean_html', 'immutable/entries', 'title'
+    html_filters.push 'immutable/clean_html', 'immutable/entries'
 
-    options[:skip_links] = true
     options[:container] = '.docContents'
     options[:root_title] = 'Immutable.js'
 
+    options[:trailing_slash] = true
+    options[:fix_urls] = ->(url) do
+      url.sub! '/index.html', ''
+      url.sub! '/index', ''
+      url
+    end
+
+
     options[:attribution] = <<-HTML
-      &copy; 2014&ndash;2015 Facebook, Inc.<br>
+      &copy; 2014–present, Lee Byron and other contributors<br>
       Licensed under the 3-clause BSD License.
     HTML
 
-    stub '' do
-      capybara = load_capybara_selenium
-      capybara.app_host = 'https://facebook.github.io'
-      capybara.visit(URL.parse(self.base_url).path)
-      capybara.execute_script <<-JS
-        var content, event, links, link;
-
-        event = document.createEvent('Event');
-        event.initEvent('hashchange', false, false);
-
-        content = document.querySelector('.docContents section').cloneNode(true);
-        links = Array.prototype.slice.call(document.querySelectorAll('.sideBar .scrollContent a'));
-
-        while (link = links.shift()) {
-          if (!document.body.contains(link)) {
-            document.body.appendChild(link);
-          }
-
-          link.click();
-          dispatchEvent(event);
-          content.innerHTML += document.querySelector('.docContents').innerHTML;
-
-          document.querySelectorAll('.sideBar .scrollContent .groupTitle').forEach(function(el) {
-            if (el.textContent == 'Types') {
-              Array.prototype.unshift.apply(links, Array.prototype.slice.call(el.parentNode.querySelectorAll('a')));
-            }
-          });
-        }
-
-        document.querySelector('.docContents').innerHTML = content.innerHTML;
-      JS
-      capybara.html
-    end
-
     def get_latest_version(opts)
       get_npm_version('immutable', opts)
     end