diff --git a/CHANGELOG.md b/CHANGELOG.md
index ae463ca..9666112 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ## [Unreleased]
 ### Added
 - Added nullable/required field modes.
+- Added support for Google's ADC.
 
 ### Changed
 - Fix company name typo.
diff --git a/README.md b/README.md
index bd01481..f0bcfc8 100644
--- a/README.md
+++ b/README.md
@@ -10,34 +10,17 @@ Via Composer
 $ composer require prologuetech/big
 ```
 
-## Configuration
-
-By default we use the following global config options with BigQuery.
-
-```php
-$this->options = [
-    'useLegacySql' => false,
-    'useQueryCache' => false,
-];
-```
-
 ## Setup
-
 Publish our config file into your application:
 
 ``` bash
 php artisan vendor:publish --provider="Prologuetech\Big\BigServiceProvider"
 ```
 
-Set our required environment variables ```BIG_AUTH_FILE``` and ```BIG_PROJECT_ID```:
-
-```.env:```
-``` php
-BIG_PROJECT_ID=my-project-0000000
-BIG_AUTH_FILE=/home/vagrant/app/storage/my-auth-0000.json
-```
+You should have a `config/prologue-big.php` file to configure defaults.
 
-Add our big service provider to your application providers:
+### Laravel 5.4.x
+Older versions of Laravel require you to add our big service provider to your application providers array in `config/app.php`:
 
 ``` php
 Prologuetech\Big\BigServiceProvider::class,
@@ -45,8 +28,24 @@ Prologuetech\Big\BigServiceProvider::class,
 
 You now have access to a familiar laravel experience, enjoy!
 
+## Google Authentication
+The Google SDK supports Application Default Credentials (ADC) and thus this package does as well. You may leave your `auth_file` field inside of your config file `null` to use ADC.
+
+For more information see the [adc docs](https://cloud.google.com/docs/authentication/production#auth-cloud-implicit-php).
+
 ## How to use
 
+### Configuration
+
+By default we use the following global config options with BigQuery.
+
+```php
+$this->options = [
+    'useLegacySql' => false,
+    'useQueryCache' => false,
+];
+```
+
 ### Tables
 
 When creating tables in BQ we automatically flip a Eloquent model schema for you. Let's cover an example of archiving data
diff --git a/config/prologue-big.php b/config/prologue-big.php
index 06204c2..189f51f 100644
--- a/config/prologue-big.php
+++ b/config/prologue-big.php
@@ -2,7 +2,7 @@
 
 return [
     'big' => [
-        'auth_file' => env('BIG_AUTH_FILE'),
+        'auth_file' => env('BIG_AUTH_FILE', null),
         'project_id' => env('BIG_PROJECT_ID'),
         'default_dataset' => env('BIG_DEFAULT_DATASET'),
     ],
diff --git a/src/Big.php b/src/Big.php
index e0bb337..a2c1af0 100644
--- a/src/Big.php
+++ b/src/Big.php
@@ -39,11 +39,18 @@ public function __construct()
             'useQueryCache' => false,
         ];
 
-        // Setup google service with credentials
-        $googleService = new ServiceBuilder([
-            'keyFilePath' => config('prologue-big.big.auth_file'),
+        // Build our Google config options
+        $config = [
             'projectId' => config('prologue-big.big.project_id'),
-        ]);
+        ];
+
+        // Allow Google's default application credentials if developer chooses
+        if (!is_null(config('prologue-big.big.auth_file'))) {
+            $config['keyFilePath'] = config('prologue-big.big.auth_file');
+        }
+
+        // Setup google service with credentials
+        $googleService = new ServiceBuilder($config);
 
         // Set a default dataset
         $this->defaultDataset = config('prologue-big.big.default_dataset');