diff --git a/composer.json b/composer.json
index c07a4d1..2008f8b 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
     },
     "require": {
         "php": ">=7.1.0",
-        "symfony/symfony": "3.4.x-dev",
+        "symfony/symfony": "^3.4",
         "doctrine/orm": "^2.5",
         "doctrine/annotations": "^1.3.0",
         "doctrine/doctrine-bundle": "^1.6",
diff --git a/composer.lock b/composer.lock
index d3e38c3..cc1ecca 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "71a9b3759d77d9b4770ae1aedcda61c6",
+    "content-hash": "dcd86eb68081a1e99e677c11da63b023",
     "packages": [
         {
             "name": "composer/ca-bundle",
@@ -2889,6 +2889,64 @@
             ],
             "time": "2017-10-11T12:05:26+00:00"
         },
+        {
+            "name": "symfony/polyfill-ctype",
+            "version": "v1.10.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-ctype.git",
+                "reference": "e3d826245268269cd66f8326bd8bc066687b4a19"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/e3d826245268269cd66f8326bd8bc066687b4a19",
+                "reference": "e3d826245268269cd66f8326bd8bc066687b4a19",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "suggest": {
+                "ext-ctype": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.9-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Ctype\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                },
+                {
+                    "name": "Gert de Pagter",
+                    "email": "backendtea@gmail.com"
+                }
+            ],
+            "description": "Symfony polyfill for ctype functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "ctype",
+                "polyfill",
+                "portable"
+            ],
+            "time": "2018-08-06T14:22:27+00:00"
+        },
         {
             "name": "symfony/polyfill-intl-icu",
             "version": "v1.6.0",
@@ -3234,16 +3292,16 @@
         },
         {
             "name": "symfony/symfony",
-            "version": "3.4.x-dev",
+            "version": "v3.4.21",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/symfony.git",
-                "reference": "e973c247c8acd032a5ee72418452c3a255d5e321"
+                "reference": "c7a57e0bcc3c57ae697f072b3e862487b6fd0030"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/symfony/zipball/e973c247c8acd032a5ee72418452c3a255d5e321",
-                "reference": "e973c247c8acd032a5ee72418452c3a255d5e321",
+                "url": "https://api.github.com/repos/symfony/symfony/zipball/c7a57e0bcc3c57ae697f072b3e862487b6fd0030",
+                "reference": "c7a57e0bcc3c57ae697f072b3e862487b6fd0030",
                 "shasum": ""
             },
             "require": {
@@ -3257,16 +3315,16 @@
                 "psr/log": "~1.0",
                 "psr/simple-cache": "^1.0",
                 "symfony/polyfill-apcu": "~1.1",
+                "symfony/polyfill-ctype": "~1.8",
                 "symfony/polyfill-intl-icu": "~1.0",
                 "symfony/polyfill-mbstring": "~1.0",
                 "symfony/polyfill-php56": "~1.0",
                 "symfony/polyfill-php70": "~1.6",
-                "symfony/polyfill-util": "~1.0",
                 "twig/twig": "^1.35|^2.4.4"
             },
             "conflict": {
                 "phpdocumentor/reflection-docblock": "<3.0||>=3.2.0,<3.2.2",
-                "phpdocumentor/type-resolver": "<0.2.1",
+                "phpdocumentor/type-resolver": "<0.3.0",
                 "phpunit/phpunit": "<4.8.35|<5.4.3,>=5.0"
             },
             "provide": {
@@ -3341,7 +3399,7 @@
                 "ocramius/proxy-manager": "~0.4|~1.0|~2.0",
                 "phpdocumentor/reflection-docblock": "^3.0|^4.0",
                 "predis/predis": "~1.0",
-                "symfony/phpunit-bridge": "~3.2",
+                "symfony/phpunit-bridge": "~3.4|~4.0",
                 "symfony/security-acl": "~2.8|~3.0"
             },
             "type": "library",
@@ -3385,7 +3443,7 @@
             "keywords": [
                 "framework"
             ],
-            "time": "2017-11-03T14:14:19+00:00"
+            "time": "2019-01-06T15:54:26+00:00"
         },
         {
             "name": "twig/extensions",
@@ -5212,7 +5270,6 @@
     "aliases": [],
     "minimum-stability": "stable",
     "stability-flags": {
-        "symfony/symfony": 20,
         "csa/guzzle-bundle": 20
     },
     "prefer-stable": false,