diff --git a/.travis.yml b/.travis.yml
index 22b121a..d33e65a 100755
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,16 +1,22 @@
 language: php
 
 php:
-  - 5.4
-  - 5.5
   - 5.6
   - 7.0
   - 7.1
   - 7.2
+  - 7.3
+
+matrix:
+  include:
+    - php: 5.4
+      dist: trusty
+    - php: 5.5
+      dist: trusty
 
 before_script:
   - composer self-update
-  - composer install --prefer-source --no-interaction --dev
+  - composer install --prefer-source --no-interaction
 
 script:
-  - phpunit --coverage-text
+  - php vendor/bin/phpunit --coverage-text
diff --git a/README.md b/README.md
index 5e606ae..2d2ef09 100755
--- a/README.md
+++ b/README.md
@@ -101,10 +101,10 @@ $fqb = new SammyK\FacebookQueryBuilder\FQB;
 $request = $fqb->node('me')
                ->fields(['id', 'email'])
                ->accessToken('user-access-token')
-               ->graphVersion('v3.1');
+               ->graphVersion('v3.3');
 
 echo $request;
-# https://graph.facebook.com/v3.1/me?access_token=user-access-token&fields=id,email
+# https://graph.facebook.com/v3.3/me?access_token=user-access-token&fields=id,email
 
 $response = file_get_contents((string) $request);
 
@@ -176,7 +176,7 @@ The recommended way to send requests & receive responses is to use the official
 $fb = new Facebook\Facebook([
     'app_id' => 'your-app-id',
     'app_secret' => 'your-app-secret',
-    'default_graph_version' => 'v3.1',
+    'default_graph_version' => 'v3.3',
     ]);
 $fqb = new SammyK\FacebookQueryBuilder\FQB;
 
@@ -208,7 +208,7 @@ As you've already seen in the basic examples above, you can simply use PHP's fle
 
 ```php
 $fqb = new SammyK\FacebookQueryBuilder\FQB([
-    'default_graph_version' => 'v3.1',
+    'default_graph_version' => 'v3.3',
     'app_secret'            => 'your-app-secret',
 ]);
 
@@ -216,7 +216,7 @@ $fqb = new SammyK\FacebookQueryBuilder\FQB([
 $request = $fqb->node('4')->accessToken('my-access-token');
 
 echo $request;
-# https://graph.facebook.com/v3.1/4?access_token=my-access-token&appsecret_proof=2ad43b865030f51531ac36bb00ce4f59d9f879ecce31b0977dbfd73fa4eca7b6
+# https://graph.facebook.com/v3.3/4?access_token=my-access-token&appsecret_proof=2ad43b865030f51531ac36bb00ce4f59d9f879ecce31b0977dbfd73fa4eca7b6
 
 $response = file_get_contents((string) $request);
 
@@ -248,7 +248,7 @@ A number of configuration settings can be set via the `FQB` constructor.
 ```php
 $fqb = new SammyK\FacebookQueryBuilder\FQB([
     'default_access_token'  => 'your-access-token',
-    'default_graph_version' => 'v3.1',
+    'default_graph_version' => 'v3.3',
     'app_secret'            => 'your-app-secret',
 ]);
 ```
@@ -285,12 +285,12 @@ If you're using some other HTTP client, you can set the default fallback Graph v
 
 ```php
 $fqb = new SammyK\FacebookQueryBuilder\FQB([
-    'default_graph_version' => 'v3.1',
+    'default_graph_version' => 'v3.3',
 ]);
 
 $request = $fqb->node('me');
 echo $request->asEndpoint();
-# /v3.1/me
+# /v3.3/me
 
 $request = $fqb->node('me')->graphVersion('v1.0');
 echo $request->asEndpoint();
@@ -403,7 +403,7 @@ modifiers(array $modifiers): FQB
 
 Some endpoints of the Graph API support additional parameters called "modifiers".
 
-An example endpoint that supports modifiers is the [`/{object-id}/comments` edge](https://developers.facebook.com/docs/graph-api/reference/v3.1/object/comments#readmodifiers).
+An example endpoint that supports modifiers is the [`/{object-id}/comments` edge](https://developers.facebook.com/docs/graph-api/reference/v3.3/object/comments#readmodifiers).
 
 ```php
 // Order the comments in chronological order
@@ -456,10 +456,10 @@ graphVersion(string $graphApiVersion): FQB
 You can set the Graph version URL prefix for a specific request with the `graphVersion()` method.
 
 ```php
-$request = $fqb->node('me')->graphVersion('v3.1');
+$request = $fqb->node('me')->graphVersion('v3.3');
 
 echo $request->asEndpoint();
-# /v3.1/me
+# /v3.3/me
 ```
 
 
diff --git a/composer.json b/composer.json
index 2a655a0..7c0b7b9 100755
--- a/composer.json
+++ b/composer.json
@@ -16,12 +16,16 @@
         "php": ">=5.4.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.0",
+        "phpunit/phpunit": "~4.0 || ~5.0",
         "squizlabs/php_codesniffer": "~2.0"
     },
     "autoload": {
         "psr-4": {
-            "SammyK\\FacebookQueryBuilder\\": "src",
+            "SammyK\\FacebookQueryBuilder\\": "src"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
             "SammyK\\FacebookQueryBuilderTests\\": "tests"
         }
     }