diff --git a/README.md b/README.md
index ad17bf4f..2a099a1e 100644
--- a/README.md
+++ b/README.md
@@ -140,6 +140,10 @@ Update bundled CA certificates from the [Mozilla cURL release][curl]:
 
     bundle exec rake update_certs
 
+Update bundled OpenAPI specification from the canonical repository:
+
+    bundle exec rake update_spec
+
 [api-keys]: https://dashboard.stripe.com/account/apikeys
 [connect]: https://stripe.com/connect
 [curl]: http://curl.haxx.se/docs/caextract.html
diff --git a/Rakefile b/Rakefile
index 078b692f..4ca5b869 100644
--- a/Rakefile
+++ b/Rakefile
@@ -6,12 +6,38 @@ Rake::TestTask.new do |t|
   t.pattern = './test/**/*_test.rb'
 end
 
-desc "update bundled certs"
+desc "Update bundled certs"
 task :update_certs do
-  require "restclient"
-  File.open(File.join(File.dirname(__FILE__), 'lib', 'data', 'ca-certificates.crt'), 'w') do |file|
-    resp = Faraday.get "https://raw.githubusercontent.com/bagder/ca-bundle/master/ca-bundle.crt"
-    abort("bad response when fetching bundle") unless resp.code == 200
-    file.write(resp.to_str)
+  require "faraday"
+
+  fetch_file "https://raw.githubusercontent.com/bagder/ca-bundle/master/ca-bundle.crt",
+    File.expand_path("../lib/data/ca-certificates.crt", __FILE__)
+end
+
+desc "Update OpenAPI specification"
+task :update_spec do
+  require "faraday"
+
+  ["fixtures.json", "fixtures.yaml", "spec.json", "spec.yaml"].map { |file|
+    Thread.new do
+      fetch_file "https://raw.githubusercontent.com/stripe/openapi/master/spec/#{file}",
+        File.expand_path("../spec/#{file}", __FILE__)
+    end
+  }.map { |t| t.join }
+end
+
+#
+# helpers
+#
+
+def fetch_file(url, dest)
+  File.open(dest, 'w') do |file|
+    resp = Faraday.get(url)
+    unless resp.status == 200
+      abort("bad response when fetching: #{url}\n" \
+        "Status #{resp.status}: #{resp.body}")
+    end
+    file.write(resp.body)
+    puts "Successfully fetched: #{url}"
   end
 end