diff --git a/core/composer.json b/core/composer.json
index c3ff963124ff2e2662f3d12e79e0bc4fd029789d..d1b567528f3308c3124f55cd5c8b67f2ae02a58f 100644
--- a/core/composer.json
+++ b/core/composer.json
@@ -35,7 +35,7 @@
         "twig/twig": "^1.38.2",
         "doctrine/common": "^2.5",
         "doctrine/annotations": "^1.2",
-        "guzzlehttp/guzzle": "^6.2.1",
+        "guzzlehttp/guzzle": "^6.3",
         "symfony-cmf/routing": "^1.4",
         "easyrdf/easyrdf": "^0.9",
         "zendframework/zend-feed": "^2.4",