diff --git a/composer.lock b/composer.lock
index 9e5e475..ad7e448 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1593,20 +1593,21 @@
         },
         {
             "name": "symfony/http-foundation",
-            "version": "v2.7.8",
+            "version": "v2.7.51",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/http-foundation.git",
-                "reference": "cf11faac7df5384bb14774ad7266add227e10ec1"
+                "reference": "b67e5cbd2bf837fb3681f2c4965826d6c6758532"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/http-foundation/zipball/cf11faac7df5384bb14774ad7266add227e10ec1",
-                "reference": "cf11faac7df5384bb14774ad7266add227e10ec1",
+                "url": "https://api.github.com/repos/symfony/http-foundation/zipball/b67e5cbd2bf837fb3681f2c4965826d6c6758532",
+                "reference": "b67e5cbd2bf837fb3681f2c4965826d6c6758532",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.9"
+                "php": ">=5.3.9",
+                "symfony/polyfill-mbstring": "~1.1"
             },
             "require-dev": {
                 "symfony/expression-language": "~2.4"
@@ -1644,7 +1645,10 @@
             ],
             "description": "Symfony HttpFoundation Component",
             "homepage": "https://symfony.com",
-            "time": "2015-12-18T15:35:58+00:00"
+            "support": {
+                "source": "https://github.com/symfony/http-foundation/tree/2.7"
+            },
+            "time": "2019-04-16T09:58:21+00:00"
         },
         {
             "name": "symfony/http-kernel",
@@ -1728,6 +1732,86 @@
             "homepage": "https://symfony.com",
             "time": "2015-12-26T15:01:55+00:00"
         },
+        {
+            "name": "symfony/polyfill-mbstring",
+            "version": "v1.19.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-mbstring.git",
+                "reference": "b5f7b932ee6fa802fc792eabd77c4c88084517ce"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/b5f7b932ee6fa802fc792eabd77c4c88084517ce",
+                "reference": "b5f7b932ee6fa802fc792eabd77c4c88084517ce",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "suggest": {
+                "ext-mbstring": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "1.19-dev"
+                },
+                "thanks": {
+                    "name": "symfony/polyfill",
+                    "url": "https://github.com/symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Polyfill\\Mbstring\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for the Mbstring extension",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "mbstring",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-mbstring/tree/v1.19.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-10-23T09:01:57+00:00"
+        },
         {
             "name": "symfony/polyfill-php56",
             "version": "v1.0.1",