diff --git a/Rakefile b/Rakefile
new file mode 100644
index 0000000..14df499
--- /dev/null
+++ b/Rakefile
@@ -0,0 +1,85 @@
+require 'open-uri'
+require 'yaml'
+
+desc 'Update index.md and spec folder based on versions in _config.yml'
+task :update do
+  config = YAML.load_file('_config.yml')
+  current_version = config['current_version']
+  versions = config['versions']
+
+  remove_all_specs(config['update'])
+
+  puts ''
+  puts 'Fetching configured spec versions:'
+  versions.each do |version|
+    spec = fetch_spec(version, config['update'])
+
+    if current_version == version
+      write_file('index.md', spec[:body], " (#{version})")
+    end
+
+    spec_file = File.join(config['update']['output_dir'], "#{version}.md")
+    write_file(spec_file, spec[:body])
+  end
+end
+
+def write_file(file, content, comment = nil)
+  puts " - #{file}#{comment}"
+  File.write(file, content)
+end
+
+def fetch_spec(version, config)
+  doc_url = config['url_tpl']
+            .gsub('{{version}}', version)
+            .gsub('{{file}}', config['files']['document'])
+  diagram_url = config['url_tpl']
+                .gsub('{{version}}', version)
+                .gsub('{{file}}', config['files']['diagram'])
+
+  document = get(doc_url)
+  diagram = get(diagram_url)
+
+  if diagram
+    img_tag = config['img_tpl'].gsub('{{file}}', "#{version}.svg")
+    document.gsub!(/\A(.*\n=+\n)/, "\\1\n#{img_tag}\n")
+  end
+
+  title = document.split("\n", 2).first
+  body = config['body_tpl']
+         .gsub('{{title}}', title)
+         .gsub('{{version}}', version)
+         .gsub('{{content}}', document)
+
+  {
+    version: version,
+    title: title,
+    body: body,
+    diagram: diagram
+  }
+end
+
+def fetch_document(url)
+  response = get(url)
+  {
+
+    body: response
+  }
+end
+
+def fetch_diagram(url)
+end
+
+def get(url)
+  URI.parse(url).read
+rescue OpenURI::HTTPError
+  nil
+end
+
+def remove_all_specs(config)
+  puts ''
+  puts 'Removing existing spec files:'
+  Dir["#{config['output_dir']}/*"].each do |file|
+    puts "   #{file.gsub(File.dirname(__FILE__), '')}"
+    File.delete(file)
+  end
+end
diff --git a/_config.yml b/_config.yml
index 7197184..f5ad053 100644
--- a/_config.yml
+++ b/_config.yml
@@ -5,9 +5,24 @@ description: >
 author: Jim Myhrberg
 url: https://commonflow.org
 
+current_version: 1.0.0-draft.10
 versions:
   - 1.0.0-draft.10
 
+update:
+  body_tpl: |
+    ---
+    title: {{title}}
+    version: {{version}}
+    ---
+    {{content}}
+  url_tpl: "https://raw.githubusercontent.com/jimeh/common-flow/{{version}}/{{file}}"
+  img_tpl: "<img src=\"/spec/{{file}}\" width=\"100%\" />"
+  output_dir: "spec"
+  files:
+    document: common-flow.md
+    diagram: common-flow.svg
+
 gems:
   - jekyll-sitemap
   - jekyll-seo-tag