diff --git a/composer.lock b/composer.lock
index 3fb41bf..93aa2ac 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4081,20 +4081,20 @@
         },
         {
             "name": "symfony/yaml",
-            "version": "v3.3.6",
+            "version": "v3.3.18",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "ddc23324e6cfe066f3dd34a37ff494fa80b617ed"
+                "reference": "af615970e265543a26ee712c958404eb9b7ac93d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/ddc23324e6cfe066f3dd34a37ff494fa80b617ed",
-                "reference": "ddc23324e6cfe066f3dd34a37ff494fa80b617ed",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/af615970e265543a26ee712c958404eb9b7ac93d",
+                "reference": "af615970e265543a26ee712c958404eb9b7ac93d",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.5.9"
+                "php": "^5.5.9|>=7.0.8"
             },
             "require-dev": {
                 "symfony/console": "~2.8|~3.0"
@@ -4132,7 +4132,7 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2017-07-23T12:43:26+00:00"
+            "time": "2018-01-20T15:04:53+00:00"
         },
         {
             "name": "twig/twig",