diff --git a/CHANGELOG.md b/CHANGELOG.md
index b92ba7eae..3acda434d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 0.8.3
+* Adds support for authorization via Application Default Credentials.
+# Adds support for tracking coverage on coveralls.io
+
 # 0.8.2
 * Fixes for file storage and missing cacerts file
 
diff --git a/README.md b/README.md
index afb6bc531..510ae817e 100644
--- a/README.md
+++ b/README.md
@@ -104,6 +104,19 @@ Credentials can be managed at the connection level, as shown, or supplied on a p
 
 For server-to-server interactions, like those between a web application and Google Cloud Storage, Prediction, or BigQuery APIs, use service accounts.
 
+As of version 0.8.3, service accounts can be configured using
+[Application Default Credentials][1], which rely on the credentials being
+available in a well-known location.  If the credentials are not present
+and it's being used on a Compute Engine VM,  it will use the VM's default credentials.
+
+```ruby
+client.authorization = :google_app_default  # in a later version, this will become the default
+client.authorization.fetch_access_token!
+client.execute(...)
+```
+
+This is simpler API to use than in previous versions, although that is still available:
+
 ```ruby
 key = Google::APIClient::KeyUtils.load_from_pkcs12('client.p12', 'notasecret')
 client.authorization = Signet::OAuth2::Client.new(
@@ -201,3 +214,5 @@ See the full list of [samples on Github](https://github.com/google/google-api-ru
 ## Support
 
 Please [report bugs at the project on Github](https://github.com/google/google-api-ruby-client/issues). Don't hesitate to [ask questions](http://stackoverflow.com/questions/tagged/google-api-ruby-client) about the client or APIs on [StackOverflow](http://stackoverflow.com).
+
+[1]: https://developers.google.com/accounts/docs/application-default-credentials
diff --git a/Rakefile b/Rakefile
index 01e62ddd6..dca3b0903 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,7 +1,9 @@
+# -*- ruby -*-
 lib_dir = File.expand_path('../lib', __FILE__)
 $LOAD_PATH.unshift(lib_dir)
 $LOAD_PATH.uniq!
 
+require 'bundler/gem_tasks'
 require 'rubygems'
 require 'rake'
 
diff --git a/google-api-client.gemspec b/google-api-client.gemspec
index 3a81293d4..6764697f4 100644
--- a/google-api-client.gemspec
+++ b/google-api-client.gemspec
@@ -26,7 +26,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'addressable', '~> 2.3'
   s.add_runtime_dependency 'signet', '~> 0.6'
   s.add_runtime_dependency 'faraday', '~> 0.9'
-  s.add_runtime_dependency 'googleauth', '~> 0.1'
+  s.add_runtime_dependency 'googleauth', '~> 0.3'
   s.add_runtime_dependency 'multi_json', '~> 1.10'
   s.add_runtime_dependency 'autoparse', "~> 0.3"
   s.add_runtime_dependency 'extlib', '~> 0.9'
@@ -38,5 +38,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'yard', '~> 0.8'
   s.add_development_dependency 'rspec', '~> 3.1'
   s.add_development_dependency 'kramdown', '~> 1.5'
-  s.add_development_dependency 'simplecov', '~> 0.9'
+  s.add_development_dependency 'simplecov', '~> 0.9.2'
+  s.add_development_dependency 'coveralls', '~> 0.7.11'
 end
diff --git a/lib/google/api_client.rb b/lib/google/api_client.rb
index 1b602b603..367b1e040 100644
--- a/lib/google/api_client.rb
+++ b/lib/google/api_client.rb
@@ -41,7 +41,7 @@ module Google
   # This class manages APIs communication.
   class APIClient
     include Google::APIClient::Logging
-    
+
     ##
     # Creates a new Google API client.
     #
@@ -58,7 +58,7 @@ module Google
     #   </ul>
     # @option options [Boolean] :auto_refresh_token (true)
     #   The setting that controls whether or not the api client attempts to
-    #   refresh authorization when a 401 is hit in #execute. If the token does 
+    #   refresh authorization when a 401 is hit in #execute. If the token does
     #   not support it, this option is ignored.
     # @option options [String] :application_name
     #   The name of the application using the client.
@@ -86,7 +86,7 @@ module Google
     #   Pass through of options to set on the Faraday connection
     def initialize(options={})
       logger.debug { "#{self.class} - Initializing client with options #{options}" }
-      
+
       # Normalize key to String to allow indifferent access.
       options = options.inject({}) do |accu, (key, value)|
         accu[key.to_sym] = value
@@ -182,7 +182,7 @@ module Google
         )
       when :google_app_default
         require 'googleauth'
-        new_authorization = Google::Auth.get_application_default(nil)
+        new_authorization = Google::Auth.get_application_default
 
       when :oauth_2
         require 'signet/oauth_2/client'
@@ -214,7 +214,7 @@ module Google
 
     ##
     # The setting that controls whether or not the api client attempts to
-    # refresh authorization when a 401 is hit in #execute. 
+    # refresh authorization when a 401 is hit in #execute.
     #
     # @return [Boolean]
     attr_accessor :auto_refresh_token
@@ -261,7 +261,7 @@ module Google
 
     ##
     # Number of times to retry on recoverable errors
-    # 
+    #
     # @return [FixNum]
     #  Number of retries
     attr_accessor :retries
@@ -471,7 +471,7 @@ module Google
     # Verifies an ID token against a server certificate. Used to ensure that
     # an ID token supplied by an untrusted client-side mechanism is valid.
     # Raises an error if the token is invalid or missing.
-    # 
+    #
     # @deprecated Use the google-id-token gem for verifying JWTs
     def verify_id_token!
       require 'jwt'
@@ -580,7 +580,7 @@ module Google
     #     - (TrueClass, FalseClass) :authenticated (default: true) -
     #       `true` if the request must be signed or somehow
     #       authenticated, `false` otherwise.
-    #     - (TrueClass, FalseClass) :gzip (default: true) - 
+    #     - (TrueClass, FalseClass) :gzip (default: true) -
     #       `true` if gzip enabled, `false` otherwise.
     #     - (FixNum) :retries -
     #       # of times to retry on recoverable errors
@@ -620,7 +620,7 @@ module Google
         options.update(params.shift) if params.size > 0
         request = self.generate_request(options)
       end
-      
+
       request.headers['User-Agent'] ||= '' + self.user_agent unless self.user_agent.nil?
       request.headers['Accept-Encoding'] ||= 'gzip' unless options[:gzip] == false
       request.headers['Content-Type'] ||= ''
@@ -629,11 +629,11 @@ module Google
 
       connection = options[:connection] || self.connection
       request.authorization = options[:authorization] || self.authorization unless options[:authenticated] == false
-      
+
       tries = 1 + (options[:retries] || self.retries)
       attempt = 0
 
-      Retriable.retriable :tries => tries, 
+      Retriable.retriable :tries => tries,
                           :on => [TransmissionError],
                           :on_retry => client_error_handler,
                           :interval => lambda {|attempts| (2 ** attempts) + rand} do
@@ -642,7 +642,7 @@ module Google
         # This 2nd level retriable only catches auth errors, and supports 1 retry, which allows
         # auth to be re-attempted without having to retry all sorts of other failures like
         # NotFound, etc
-        Retriable.retriable :tries => ((expired_auth_retry || tries > 1) && attempt == 1) ? 2 : 1, 
+        Retriable.retriable :tries => ((expired_auth_retry || tries > 1) && attempt == 1) ? 2 : 1,
                             :on => [AuthorizationError],
                             :on_retry => authorization_error_handler(request.authorization) do
           result = request.send(connection, true)
@@ -709,7 +709,7 @@ module Google
       end
       return Addressable::Template.new(@base_uri + template).expand(mapping)
     end
-    
+
 
     ##
     # Returns on proc for special processing of retries for authorization errors
@@ -719,7 +719,7 @@ module Google
     #   OAuth 2 credentials
     # @return [Proc]
     def authorization_error_handler(authorization)
-      can_refresh = authorization.respond_to?(:refresh_token) && auto_refresh_token 
+      can_refresh = authorization.respond_to?(:refresh_token) && auto_refresh_token
       Proc.new do |exception, tries|
         next unless exception.kind_of?(AuthorizationError)
         if can_refresh
diff --git a/lib/google/api_client/version.rb b/lib/google/api_client/version.rb
index 228fa1444..070528b18 100644
--- a/lib/google/api_client/version.rb
+++ b/lib/google/api_client/version.rb
@@ -18,7 +18,7 @@ module Google
     module VERSION
       MAJOR = 0
       MINOR = 8
-      TINY  = 2
+      TINY  = 3
       PATCH = nil
       STRING = [MAJOR, MINOR, TINY, PATCH].compact.join('.')
     end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 902276c14..1c64a4e8c 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -6,7 +6,9 @@ require 'faraday'
 
 begin
   require 'simplecov'
+  require 'coveralls'
 
+  SimpleCov.formatter = Coveralls::SimpleCov::Formatter
   SimpleCov.start
 rescue LoadError
   # SimpleCov missing, so just run specs with no coverage.