diff --git a/composer.lock b/composer.lock
index a85a0e7..ff5e931 100644
--- a/composer.lock
+++ b/composer.lock
@@ -141,16 +141,16 @@
         },
         {
             "name": "guzzlehttp/guzzle",
-            "version": "6.3.0",
+            "version": "6.3.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "f4db5a78a5ea468d4831de7f0bf9d9415e348699"
+                "reference": "68d0ea14d5a3f42a20e87632a5f84931e2709c90"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/f4db5a78a5ea468d4831de7f0bf9d9415e348699",
-                "reference": "f4db5a78a5ea468d4831de7f0bf9d9415e348699",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/68d0ea14d5a3f42a20e87632a5f84931e2709c90",
+                "reference": "68d0ea14d5a3f42a20e87632a5f84931e2709c90",
                 "shasum": ""
             },
             "require": {
@@ -160,7 +160,7 @@
             },
             "require-dev": {
                 "ext-curl": "*",
-                "phpunit/phpunit": "^4.0 || ^5.0",
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.4",
                 "psr/log": "^1.0"
             },
             "suggest": {
@@ -169,7 +169,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "6.2-dev"
+                    "dev-master": "6.3-dev"
                 }
             },
             "autoload": {
@@ -202,7 +202,7 @@
                 "rest",
                 "web service"
             ],
-            "time": "2017-06-22T18:50:49+00:00"
+            "time": "2018-03-26T16:33:04+00:00"
         },
         {
             "name": "guzzlehttp/promises",
@@ -1402,16 +1402,16 @@
         },
         {
             "name": "heroku/heroku-buildpack-php",
-            "version": "v132",
+            "version": "v134",
             "source": {
                 "type": "git",
                 "url": "https://github.com/heroku/heroku-buildpack-php.git",
-                "reference": "dd950a605fb0c5e50ab71774e299fa26c9093f80"
+                "reference": "16dd536d084b2a12528713a1efda113f22c6b378"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/heroku/heroku-buildpack-php/zipball/dd950a605fb0c5e50ab71774e299fa26c9093f80",
-                "reference": "dd950a605fb0c5e50ab71774e299fa26c9093f80",
+                "url": "https://api.github.com/repos/heroku/heroku-buildpack-php/zipball/16dd536d084b2a12528713a1efda113f22c6b378",
+                "reference": "16dd536d084b2a12528713a1efda113f22c6b378",
                 "shasum": ""
             },
             "bin": [
@@ -1442,7 +1442,7 @@
                 "nginx",
                 "php"
             ],
-            "time": "2018-03-02T17:10:10+00:00"
+            "time": "2018-03-30T20:37:55+00:00"
         },
         {
             "name": "myclabs/deep-copy",