diff --git a/composer.lock b/composer.lock
index 098cfa3..b555186 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,7 +1,7 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
     "content-hash": "b8d86a70acad2a9d0fe257441ab934d2",
@@ -269,6 +269,9 @@
                 "request",
                 "response"
             ],
+            "support": {
+                "source": "https://github.com/php-fig/http-message/tree/master"
+            },
             "time": "2016-08-06T14:39:51+00:00"
         },
         {
@@ -628,21 +631,21 @@
         },
         {
             "name": "zendframework/zend-diactoros",
-            "version": "1.4.0",
+            "version": "1.8.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/zendframework/zend-diactoros.git",
-                "reference": "b03f285a333f51e58c95cce54109a4a9ed691436"
+                "reference": "736ffa7c2bfa4a60e8a10acb316fa2ac456c5fba"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/zendframework/zend-diactoros/zipball/b03f285a333f51e58c95cce54109a4a9ed691436",
-                "reference": "b03f285a333f51e58c95cce54109a4a9ed691436",
+                "url": "https://api.github.com/repos/zendframework/zend-diactoros/zipball/736ffa7c2bfa4a60e8a10acb316fa2ac456c5fba",
+                "reference": "736ffa7c2bfa4a60e8a10acb316fa2ac456c5fba",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.4 || ^7.0",
-                "psr/http-message": "~1.0"
+                "php": "^5.6 || ^7.0",
+                "psr/http-message": "^1.0"
             },
             "provide": {
                 "psr/http-message-implementation": "1.0"
@@ -650,17 +653,28 @@
             "require-dev": {
                 "ext-dom": "*",
                 "ext-libxml": "*",
-                "phpunit/phpunit": "^4.6 || ^5.5",
-                "zendframework/zend-coding-standard": "~1.0.0"
+                "phpunit/phpunit": "^5.7.16 || ^6.0.8 || ^7.2.7",
+                "zendframework/zend-coding-standard": "~1.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.4-dev",
-                    "dev-develop": "1.5-dev"
+                    "dev-master": "1.8.x-dev",
+                    "dev-develop": "1.9.x-dev",
+                    "dev-release-2.0": "2.0.x-dev"
                 }
             },
             "autoload": {
+                "files": [
+                    "src/functions/create_uploaded_file.php",
+                    "src/functions/marshal_headers_from_sapi.php",
+                    "src/functions/marshal_method_from_sapi.php",
+                    "src/functions/marshal_protocol_version_from_sapi.php",
+                    "src/functions/marshal_uri_from_sapi.php",
+                    "src/functions/normalize_server.php",
+                    "src/functions/normalize_uploaded_files.php",
+                    "src/functions/parse_cookie_header.php"
+                ],
                 "psr-4": {
                     "Zend\\Diactoros\\": "src/"
                 }
@@ -676,7 +690,12 @@
                 "psr",
                 "psr-7"
             ],
-            "time": "2017-04-06T16:18:34+00:00"
+            "support": {
+                "issues": "https://github.com/zendframework/zend-diactoros/issues",
+                "source": "https://github.com/zendframework/zend-diactoros"
+            },
+            "abandoned": "laminas/laminas-diactoros",
+            "time": "2018-08-01T13:47:49+00:00"
         }
     ],
     "packages-dev": [
@@ -3098,5 +3117,6 @@
     "platform": {
         "php": "^7.0"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "2.3.0"
 }