diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5657f6e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+vendor
\ No newline at end of file
diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 17172fc..6192a72 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -2,34 +2,22 @@
 
 namespace Oh\GoogleMapFormTypeBundle\DependencyInjection;
 
-
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
 use Symfony\Component\Config\Definition\ConfigurationInterface;
 
-/**
- * This is the class that validates and merges configuration from your app/config files
- *
- * To learn more see {@link http://symfony.com/doc/current/cookbook/bundles/extension.html#cookbook-bundles-extension-config-class}
- */
 class Configuration implements ConfigurationInterface
 {
-    /**
-     * {@inheritDoc}
-     */
     public function getConfigTreeBuilder()
     {
         $treeBuilder = new TreeBuilder();
         
         $rootNode = $treeBuilder->root('oh_google_map_form_type');
 
-        // Here you should define the parameters that are allowed to
-        // configure your bundle. See the documentation linked above for
-        // more information on that topic.
         $rootNode
             ->children()
-            ->scalarNode('api_key')
+                ->scalarNode('api_key')->isRequired()->cannotBeEmpty()
             ->end()
-            ->end();
+        ->end();
 
         return $treeBuilder;
     }
diff --git a/DependencyInjection/OhGoogleMapFormTypeExtension.php b/DependencyInjection/OhGoogleMapFormTypeExtension.php
index 0de5ae3..d7104bb 100644
--- a/DependencyInjection/OhGoogleMapFormTypeExtension.php
+++ b/DependencyInjection/OhGoogleMapFormTypeExtension.php
@@ -2,33 +2,19 @@
 
 namespace Oh\GoogleMapFormTypeBundle\DependencyInjection;
 
+use Oh\GoogleMapFormTypeBundle\Form\Type\GoogleMapType;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\Config\FileLocator;
 use Symfony\Component\HttpKernel\DependencyInjection\Extension;
-use Symfony\Component\DependencyInjection\Loader;
 
-/**
- * This is the class that loads and manages your bundle configuration
- *
- * To learn more see {@link http://symfony.com/doc/current/cookbook/bundles/extension.html}
- */
 class OhGoogleMapFormTypeExtension extends Extension
 {
-    /**
-     * {@inheritDoc}
-     */
     public function load(array $configs, ContainerBuilder $container)
     {
-        $configuration = new Configuration();
-        $config = $this->processConfiguration($configuration, $configs);
-
-
-        $loader = new Loader\XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
-        $loader->load('services.xml');
-
-        $container
-            ->getDefinition('form.type.oh_google_maps')
-            ->addArgument($config['api_key']);
+        $config = $this->processConfiguration(new Configuration(), $configs);
 
+        $container->register('form.type.oh_google_maps', GoogleMapType::class)
+            ->addArgument($config['api_key'])
+            ->addTag('form.type')
+        ;
     }
 }
diff --git a/Form/Type/GoogleMapType.php b/Form/Type/GoogleMapType.php
index 07f0437..a4ad314 100644
--- a/Form/Type/GoogleMapType.php
+++ b/Form/Type/GoogleMapType.php
@@ -4,7 +4,6 @@
 
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\Extension\Core\Type\ButtonType;
-use Symfony\Component\Form\Extension\Core\Type\FormType;
 use Symfony\Component\Form\Extension\Core\Type\TextType;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\FormInterface;
@@ -13,10 +12,10 @@
 
 class GoogleMapType extends AbstractType
 {
-
     private $api_key;
 
-    public function __construct($api_key){
+    public function __construct($api_key)
+    {
         $this->api_key = $api_key;
     }
 
@@ -92,16 +91,6 @@ public function buildView(FormView $view, FormInterface $form, array $options)
         $view->vars['include_gmaps_js'] = $options['include_gmaps_js'];
     }
 
-    public function getParent()
-    {
-        return FormType::class;
-    }
-
-    public function getName()
-    {
-        return 'oh_google_maps';
-    }
-
     public function getBlockPrefix()
     {
         return 'oh_google_maps';
diff --git a/README.md b/README.md
index f08249d..835c4cf 100644
--- a/README.md
+++ b/README.md
@@ -21,17 +21,12 @@ public function registerBundles()
             // ...
 ```
 
-You might need to change a couple of options if you are trying to use Symfony 2.0
 
-Add OhGoogleMapFormTypeBundle to assetic
-```yaml
-# app/config/config.yml
-# Assetic Configuration
-assetic:
-    bundles:        [ 'OhGoogleMapFormTypeBundle' ]
-    
-...
+Add a file  
+`vendor/oh/google-map-form-type-bundle/Oh/GoogleMapFormTypeBundle/Resources/public/js/jquery.ohgooglemaps.js`
+to your webpack encore config.
 
+```
 oh_google_map_form_type:
     api_key: "%google_maps_api_key%"
 ```
@@ -41,10 +36,19 @@ Usage
 
 This bundle contains a new FormType called GoogleMapType which can be used in your forms like so:
 
-    $builder->add('latlng', 'oh_google_maps');
+```php
+<?php
+
+use Oh\GoogleMapFormTypeBundle\Form\Type\GoogleMapType;
+    
+/** @var \Symfony\Component\Form\FormBuilderInterface $builder */
+$builder->add('latlng', GoogleMapType::class);
+```
 
 On your model you will have to process the latitude and longitude array
 
+```php
+<?php
     // Your model eg, src/My/Location/Entity/MyLocation.php
     use Symfony\Component\Validator\Constraints as Assert;
     use Oh\GoogleMapFormTypeBundle\Validator\Constraints as OhAssert;
@@ -70,18 +74,22 @@ On your model you will have to process the latitude and longitude array
         }
 
     }
+```
 
 Include the twig template for the layout. It's generally a good idea to overwrite the form template in your own twig template
 
+```yaml
     # your config.yml
     twig:
         form:
             resources:
                 # This uses the default - you can put your own one here
                 - 'OhGoogleMapFormTypeBundle:Form:fields.html.twig'
+```
 
 If you are intending to override some of the elements in the template then you can do so by extending the default `google_maps.html.twig`. This example adds a callback to the javascript when a new map position is selected.
 
+```twig
     {# your template which is inluded in the config.yml (above) 
        eg src/My/Location/Resources/views/Form/fields.html.twig #}
     {% extends "OhGoogleMapFormTypeBundle:Form:google_maps.html.twig" %}
@@ -93,13 +101,14 @@ If you are intending to override some of the elements in the template then you c
 				}
 			</script>	
     {% endblock %}
-
+```
 
 Options
 -------
 
 There are a number of options, mostly self-explanatory
 
+```
     array(
 		'type'           => 'text',  // the types to render the lat and lng fields as
 		'options'        => array(), // the options for both the fields
@@ -116,6 +125,7 @@ There are a number of options, mostly self-explanatory
 		'include_jquery' => false,   // jquery needs to be included above the field (ie not at the bottom of the page)
 		'include_gmaps_js'=>true     // is this the best place to include the google maps javascript?
 	)
+```
 
 Screenshots
 -------
diff --git a/Resources/config/config.yml b/Resources/config/config.yml
deleted file mode 100644
index e69de29..0000000
diff --git a/Resources/config/services.xml b/Resources/config/services.xml
deleted file mode 100644
index 2bf0328..0000000
--- a/Resources/config/services.xml
+++ /dev/null
@@ -1,17 +0,0 @@
-<?xml version="1.0" ?>
-
-<container xmlns="http://symfony.com/schema/dic/services"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
-
-    <parameters>
-        <parameter key="form.type.oh_google_maps.class">Oh\GoogleMapFormTypeBundle\Form\Type\GoogleMapType</parameter>
-    </parameters>
-
-    <services>
-        <!-- oh_google_maps form type -->
-        <service id="form.type.oh_google_maps" class="%form.type.oh_google_maps.class%">
-            <tag name="form.type" alias="oh_google_maps" />
-        </service>
-    </services>
-</container>
diff --git a/Resources/views/Form/google_maps.html.twig b/Resources/views/Form/google_maps.html.twig
index 651cac2..2fb7f1c 100644
--- a/Resources/views/Form/google_maps.html.twig
+++ b/Resources/views/Form/google_maps.html.twig
@@ -20,16 +20,14 @@
 	{% endblock %}
 	{% block oh_google_maps_javascripts %}
 		{% if include_jquery %}
-		<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js"></script>
+		<script
+				src="https://code.jquery.com/jquery-1.7.2.min.js"
+				integrity="sha256-R7aNzoy2gFrVs+pNJ6+SokH04ppcEqJ0yFLkNGoFALQ="
+				crossorigin="anonymous"></script>
 		{% endif %}
 		{% if include_gmaps_js %}
 		<script type="text/javascript" src="//maps.google.com/maps/api/js?key={{ api_key }}"></script>
 		{% endif %}
-		{% javascripts
-			'@OhGoogleMapFormTypeBundle/Resources/public/js/jquery.ohgooglemaps.js'
-		%}
-		<script type="text/javascript" src="{{ asset_url }}"></script>
-		{% endjavascripts %}
 	{% endblock %}
 	{% block oh_google_maps_javascript %}
 		{% block oh_google_maps_callback %}
diff --git a/composer.json b/composer.json
index 53a9759..40c8963 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,9 @@
     ],
     "require": {
         "php": ">=5.3.2",
-        "symfony/framework-bundle": "^2.1 || ^3.0"
+        "symfony/framework-bundle": "^3.4 || ^4.1",
+        "symfony/form": "^3.4 || ^4.1",
+        "symfony/validator": "^3.4 || ^4.1"
     },
     "autoload": {
         "psr-0": {