diff --git a/composer.json b/composer.json
index a9e77c2b..1749355b 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
 	},
 	"require": {
 		"php": ">=5.3.3",
-		"symfony/symfony": "2.3.*",
+		"symfony/symfony": "2.8.*",
 		"doctrine/orm": "~2.2,>=2.2.3",
 		"doctrine/doctrine-bundle": "1.2.*",
 		"twig/extensions": "1.0.*",
diff --git a/composer.lock b/composer.lock
index 6e508983..56468e40 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,10 +1,10 @@
 {
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         "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
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-    "content-hash": "8d4c4a53a82c958e01b372273a63ec27",
+    "content-hash": "73da706470a1fafff28e5c278aad803d",
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@@ -190,35 +190,35 @@
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             "require": {
                 "doctrine/lexer": "1.*",
-                "php": ">=5.3.2"
+                "php": "^5.6 || ^7.0"
             },
             "require-dev": {
                 "doctrine/cache": "1.*",
-                "phpunit/phpunit": "4.*"
+                "phpunit/phpunit": "^5.7"
             },
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             "extra": {
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-                    "dev-master": "1.3.x-dev"
+                    "dev-master": "1.4.x-dev"
                 }
             },
             "autoload": {
-                "psr-0": {
-                    "Doctrine\\Common\\Annotations\\": "lib/"
+                "psr-4": {
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                 }
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             "notification-url": "https://packagist.org/downloads/",
@@ -254,41 +254,46 @@
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                 "parser"
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-            "time": "2014-09-25T16:45:30+00:00"
+            "support": {
+                "issues": "https://github.com/doctrine/annotations/issues",
+                "source": "https://github.com/doctrine/annotations/tree/v1.4.0"
+            },
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+                "php": "~5.5|~7.0"
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                 "doctrine/common": ">2.2,<2.4"
             },
             "require-dev": {
-                "phpunit/phpunit": ">=3.7",
+                "phpunit/phpunit": "~4.8|~5.0",
+                "predis/predis": "~1.0",
                 "satooshi/php-coveralls": "~0.6"
             },
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             "extra": {
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+                    "dev-master": "1.6.x-dev"
                 }
             },
             "autoload": {
-                "psr-0": {
-                    "Doctrine\\Common\\Cache\\": "lib/"
+                "psr-4": {
+                    "Doctrine\\Common\\Cache\\": "lib/Doctrine/Common/Cache"
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             "notification-url": "https://packagist.org/downloads/",
@@ -323,29 +328,37 @@
                 "cache",
                 "caching"
             ],
-            "time": "2014-09-17T14:24:04+00:00"
+            "support": {
+                "issues": "https://github.com/doctrine/cache/issues",
+                "source": "https://github.com/doctrine/cache/tree/1.6.x"
+            },
+            "time": "2017-07-22T12:49:21+00:00"
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         {
             "name": "doctrine/collections",
-            "version": "v1.2",
+            "version": "v1.4.0",
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                 "url": "https://github.com/doctrine/collections.git",
-                "reference": "b99c5c46c87126201899afe88ec490a25eedd6a2"
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+                "php": "^5.6 || ^7.0"
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@@ -358,17 +371,6 @@
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-                    "email": "jonwage@gmail.com",
-                    "homepage": "http://www.jwage.com/",
-                    "role": "Creator"
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-                    "email": "guilhermeblanco@gmail.com",
-                    "homepage": "http://www.instaclick.com"
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                     "email": "roman@code-factory.org"
@@ -377,11 +379,17 @@
                     "name": "Benjamin Eberlei",
                     "email": "kontakt@beberlei.de"
                 },
+                {
+                    "name": "Guilherme Blanco",
+                    "email": "guilhermeblanco@gmail.com"
+                },
+                {
+                    "name": "Jonathan Wage",
+                    "email": "jonwage@gmail.com"
+                },
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-                    "email": "schmittjoh@gmail.com",
-                    "homepage": "https://github.com/schmittjoh",
-                    "role": "Developer of wrapped JMSSerializerBundle"
+                    "email": "schmittjoh@gmail.com"
                 }
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@@ -391,20 +399,24 @@
                 "collections",
                 "iterator"
             ],
-            "time": "2014-02-03T23:07:43+00:00"
+            "support": {
+                "issues": "https://github.com/doctrine/collections/issues",
+                "source": "https://github.com/doctrine/collections/tree/master"
+            },
+            "time": "2017-01-03T10:49:41+00:00"
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-            "version": "v2.4.2",
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                 "url": "https://github.com/doctrine/common.git",
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@@ -434,17 +446,6 @@
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                     "email": "roman@code-factory.org"
@@ -453,11 +454,17 @@
                     "name": "Benjamin Eberlei",
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                 },
+                {
+                    "name": "Guilherme Blanco",
+                    "email": "guilhermeblanco@gmail.com"
+                },
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+                    "name": "Jonathan Wage",
+                    "email": "jonwage@gmail.com"
+                },
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-                    "email": "schmittjoh@gmail.com",
-                    "homepage": "https://github.com/schmittjoh",
-                    "role": "Developer of wrapped JMSSerializerBundle"
+                    "email": "schmittjoh@gmail.com"
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@@ -469,7 +476,11 @@
                 "persistence",
                 "spl"
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-            "time": "2014-05-21T19:28:51+00:00"
+            "support": {
+                "issues": "https://github.com/doctrine/common/issues",
+                "source": "https://github.com/doctrine/common/tree/v2.4.3"
+            },
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@@ -783,22 +794,30 @@
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-            "version": "v1.0",
+            "version": "v1.1.0",
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                 "type": "git",
                 "url": "https://github.com/doctrine/inflector.git",
-                "reference": "54b8333d2a5682afdc690060c1cf384ba9f47f08"
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@@ -809,17 +828,6 @@
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@@ -828,44 +836,61 @@
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+                    "email": "guilhermeblanco@gmail.com"
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-                    "email": "schmittjoh@gmail.com",
-                    "homepage": "https://github.com/schmittjoh",
-                    "role": "Developer of wrapped JMSSerializerBundle"
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             "homepage": "http://www.doctrine-project.org",
             "keywords": [
                 "inflection",
-                "pluarlize",
-                "singuarlize",
+                "pluralize",
+                "singularize",
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-            "version": "v1.0",
+            "version": "1.0.2",
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                 "url": "https://github.com/doctrine/lexer.git",
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@@ -873,29 +898,33 @@
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-                    "homepage": "http://www.instaclick.com"
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+                    "email": "guilhermeblanco@gmail.com"
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-                    "email": "schmittjoh@gmail.com",
-                    "homepage": "https://github.com/schmittjoh",
-                    "role": "Developer of wrapped JMSSerializerBundle"
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-            "description": "Base library for a lexer that can be used in Top-Down, Recursive Descent Parsers.",
-            "homepage": "http://www.doctrine-project.org",
+            "description": "PHP Doctrine Lexer parser library that can be used in Top-Down, Recursive Descent Parsers.",
+            "homepage": "https://www.doctrine-project.org/projects/lexer.html",
             "keywords": [
+                "annotations",
+                "docblock",
                 "lexer",
-                "parser"
+                "parser",
+                "php"
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-            "time": "2013-01-12T18:59:04+00:00"
+            "support": {
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+            },
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@@ -1376,6 +1405,52 @@
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+            "version": "v1.0.4",
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+            "autoload": {
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+                    "lib/password.php"
+                ]
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+                    "email": "ircmaxell@php.net",
+                    "homepage": "http://blog.ircmaxell.com"
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+            "description": "A compatibility library for the proposed simplified password hashing algorithm: https://wiki.php.net/rfc/password_hash",
+            "homepage": "https://github.com/ircmaxell/password_compat",
+            "keywords": [
+                "hashing",
+                "password"
+            ],
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+                "source": "https://github.com/ircmaxell/password_compat/tree/v1.0"
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@@ -1988,16 +2063,16 @@
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@@ -2008,13 +2083,16 @@
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+                "ruflin/elastica": ">=0.90 <3.0",
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+                "swiftmailer/swiftmailer": "^5.3|^6.0"
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@@ -2022,17 +2100,14 @@
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-                "raven/raven": "Allow sending log messages to a Sentry server",
+                "mongodb/mongodb": "Allow sending log messages to a MongoDB server via PHP Driver",
+                "php-amqplib/php-amqplib": "Allow sending log messages to an AMQP server using php-amqplib",
+                "php-console/php-console": "Allow sending log messages to Google Chrome",
                 "rollbar/rollbar": "Allow sending log messages to Rollbar",
                 "ruflin/elastica": "Allow sending log messages to an Elastic Search server",
-                "videlalvaro/php-amqplib": "Allow sending log messages to an AMQP server using php-amqplib"
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+                    "homepage": "https://paragonie.com"
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+            "description": "PHP 5.x polyfill for random_bytes() and random_int() from PHP 7",
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@@ -2527,28 +2682,29 @@
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@@ -2570,12 +2726,18 @@
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@@ -2793,16 +3739,21 @@
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                 "symfony/http-kernel": "self.version",
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                 "symfony/process": "self.version",
-                "symfony/propel1-bridge": "self.version",
                 "symfony/property-access": "self.version",
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@@ -2811,34 +3762,44 @@
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-            "homepage": "http://symfony.com",
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                 "framework"
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@@ -2911,30 +3876,38 @@
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@@ -2948,23 +3921,26 @@
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                     "role": "Lead Developer"
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                 {
                     "name": "Armin Ronacher",
                     "email": "armin.ronacher@active-4.com",
                     "role": "Project Founder"
-                },
-                {
-                    "name": "Twig Team",
-                    "homepage": "https://github.com/fabpot/Twig/graphs/contributors",
-                    "role": "Contributors"
                 }
             ],
             "description": "Twig, the flexible, fast, and secure template language for PHP",
-            "homepage": "http://twig.sensiolabs.org",
+            "homepage": "https://twig.symfony.com",
             "keywords": [
                 "templating"
             ],
-            "time": "2014-10-17T12:53:44+00:00"
+            "support": {
+                "issues": "https://github.com/twigphp/Twig/issues",
+                "source": "https://github.com/twigphp/Twig/tree/1.x"
+            },
+            "time": "2020-02-11T05:59:23+00:00"
         },
         {
             "name": "wrep/bugsnag-php-symfony",
@@ -3035,5 +4011,6 @@
     "platform": {
         "php": ">=5.3.3"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "2.3.0"
 }