diff --git a/composer.lock b/composer.lock
index 6622a70a91..28159268a2 100644
--- a/composer.lock
+++ b/composer.lock
@@ -2244,35 +2244,38 @@
         },
         {
             "name": "twig/twig",
-            "version": "v1.32.0",
+            "version": "v1.34.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/twigphp/Twig.git",
-                "reference": "9935b662e24d6e634da88901ab534cc12e8c728f"
+                "reference": "f878bab48edb66ad9c6ed626bf817f60c6c096ee"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/twigphp/Twig/zipball/9935b662e24d6e634da88901ab534cc12e8c728f",
-                "reference": "9935b662e24d6e634da88901ab534cc12e8c728f",
+                "url": "https://api.github.com/repos/twigphp/Twig/zipball/f878bab48edb66ad9c6ed626bf817f60c6c096ee",
+                "reference": "f878bab48edb66ad9c6ed626bf817f60c6c096ee",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.2.7"
+                "php": ">=5.3.3"
             },
             "require-dev": {
                 "psr/container": "^1.0",
                 "symfony/debug": "~2.7",
-                "symfony/phpunit-bridge": "~3.2"
+                "symfony/phpunit-bridge": "~3.3@dev"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.32-dev"
+                    "dev-master": "1.34-dev"
                 }
             },
             "autoload": {
                 "psr-0": {
                     "Twig_": "lib/"
+                },
+                "psr-4": {
+                    "Twig\\": "src/"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -2302,7 +2305,7 @@
             "keywords": [
                 "templating"
             ],
-            "time": "2017-02-27T00:07:03+00:00"
+            "time": "2017-07-04T13:19:31+00:00"
         },
         {
             "name": "wikimedia/composer-merge-plugin",
diff --git a/core/composer.json b/core/composer.json
index 0d103002c7..0ae67eaa5a 100644
--- a/core/composer.json
+++ b/core/composer.json
@@ -18,7 +18,7 @@
         "symfony/process": "^3.2",
         "symfony/polyfill-iconv": "^1.0",
         "symfony/yaml": "^3.2",
-        "twig/twig": "^1.23.1",
+        "twig/twig": "^1.33.2",
         "doctrine/common": "^2.5",
         "doctrine/annotations": "^1.2",
         "guzzlehttp/guzzle": "^6.2.1",