diff --git a/composer.json b/composer.json
index e8112ace..454fb7a6 100644
--- a/composer.json
+++ b/composer.json
@@ -27,8 +27,7 @@
         "symfony/dependency-injection": "^3.0||^4.0",
         "symfony/event-dispatcher": "^3.0||^4.0",
         "symfony/http-kernel": "^3.0||^4.0",
-        "symfony/security-core": "^3.0||^4.0",
-        "symfony/yaml": "^3.0||^4.0"
+        "symfony/security-core": "^3.0||^4.0"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^2.8",
diff --git a/src/DependencyInjection/SentryExtension.php b/src/DependencyInjection/SentryExtension.php
index 756f8e51..30948c94 100644
--- a/src/DependencyInjection/SentryExtension.php
+++ b/src/DependencyInjection/SentryExtension.php
@@ -24,8 +24,8 @@ public function load(array $configs, ContainerBuilder $container)
     {
         $configuration = new Configuration();
         $config = $this->processConfiguration($configuration, $configs);
-        $loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__ . '/../Resources/config'));
-        $loader->load('services.yml');
+        $loader = new Loader\XmlFileLoader($container, new FileLocator(__DIR__ . '/../Resources/config'));
+        $loader->load('services.xml');
 
         foreach ($config as $key => $value) {
             $container->setParameter('sentry.' . $key, $value);
diff --git a/src/Resources/config/services.xml b/src/Resources/config/services.xml
new file mode 100644
index 00000000..c322f116
--- /dev/null
+++ b/src/Resources/config/services.xml
@@ -0,0 +1,30 @@
+<?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">
+
+    <services>
+        <service id="sentry.client" class="%sentry.client%" public="true">
+            <argument>%sentry.dsn%</argument>
+            <argument>%sentry.options%</argument>
+            <call method="install" />
+        </service>
+
+        <service id="%sentry.client%" alias="sentry.client" />
+
+        <service id="sentry.exception_listener" class="%sentry.exception_listener%">
+            <argument type="service" id="sentry.client" />
+            <argument type="service" id="event_dispatcher" />
+            <argument type="service" id="request_stack" />
+            <argument>%sentry.skip_capture%</argument>
+            <argument type="service" id="security.token_storage" on-invalid="ignore" />
+            <argument type="service" id="security.authorization_checker" on-invalid="ignore" />
+
+            <tag name="kernel.event_listener" event="kernel.request" method="onKernelRequest" priority="%sentry.listener_priorities.request%" />
+            <tag name="kernel.event_listener" event="kernel.exception" method="onKernelException" priority="%sentry.listener_priorities.kernel_exception%" />
+            <tag name="kernel.event_listener" event="console.command" method="onConsoleCommand" />
+            <tag name="kernel.event_listener" event="console.error" method="onConsoleError" priority="%sentry.listener_priorities.console_exception%" />
+        </service>
+    </services>
+</container>
diff --git a/src/Resources/config/services.yml b/src/Resources/config/services.yml
deleted file mode 100644
index c7a1b3bd..00000000
--- a/src/Resources/config/services.yml
+++ /dev/null
@@ -1,24 +0,0 @@
-services:
-  sentry.client:
-    class: '%sentry.client%'
-    arguments: ['%sentry.dsn%', '%sentry.options%']
-    public: true
-    calls:
-      - [install, []]
-      
-  '%sentry.client%': '@sentry.client'
-  
-  sentry.exception_listener:
-    class: '%sentry.exception_listener%'
-    arguments:
-      - '@sentry.client'
-      - '@event_dispatcher'
-      - '@request_stack'
-      - '%sentry.skip_capture%'
-      - '@?security.token_storage'
-      - '@?security.authorization_checker'
-    tags:
-      - { name: kernel.event_listener, event: kernel.request,    method: onKernelRequest, priority: '%sentry.listener_priorities.request%'}
-      - { name: kernel.event_listener, event: kernel.exception,  method: onKernelException, priority: '%sentry.listener_priorities.kernel_exception%' }
-      - { name: kernel.event_listener, event: console.command,   method: onConsoleCommand }
-      - { name: kernel.event_listener, event: console.error,     method: onConsoleError, priority: '%sentry.listener_priorities.console_exception%' }