diff --git a/composer.json b/composer.json
index a4b05eb..60b7b7b 100644
--- a/composer.json
+++ b/composer.json
@@ -3,13 +3,13 @@
     "description" : "ODM for dynamodb",
     "type"        : "library",
     "require"     : {
-        "php"                 : ">=5.6",
+        "php"                 : "^7.1.3",
         "doctrine/annotations": "^1.4",
         "oasis/aws-wrappers"  : "^2.10",
         "oasis/logging"       : "^1.0",
         "doctrine/common"     : "^2.7",
-        "symfony/console"     : "^3.2",
-        "symfony/finder"      : "^3.2"
+        "symfony/console"     : "^4.0",
+        "symfony/finder"      : "^4.0"
     },
     "require-dev" : {
         "phpunit/phpunit": "^5.7"
diff --git a/composer.lock b/composer.lock
index 5c7bb29..0947c6b 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "a603c906d888164371d947aae8adb23d",
+    "content-hash": "7b1cc95ba058a9ed56fe14e3752ae593",
     "packages": [
         {
             "name": "aws/aws-sdk-php",
@@ -1243,44 +1243,44 @@
         },
         {
             "name": "symfony/console",
-            "version": "v3.3.13",
+            "version": "v4.0.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "63cd7960a0a522c3537f6326706d7f3b8de65805"
+                "reference": "aad9a6fe47319f22748fd764f52d3a7ca6fa6b64"
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-                "url": "https://api.github.com/repos/symfony/console/zipball/63cd7960a0a522c3537f6326706d7f3b8de65805",
-                "reference": "63cd7960a0a522c3537f6326706d7f3b8de65805",
+                "url": "https://api.github.com/repos/symfony/console/zipball/aad9a6fe47319f22748fd764f52d3a7ca6fa6b64",
+                "reference": "aad9a6fe47319f22748fd764f52d3a7ca6fa6b64",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.5.9|>=7.0.8",
-                "symfony/debug": "~2.8|~3.0",
+                "php": "^7.1.3",
                 "symfony/polyfill-mbstring": "~1.0"
             },
             "conflict": {
-                "symfony/dependency-injection": "<3.3"
+                "symfony/dependency-injection": "<3.4",
+                "symfony/process": "<3.3"
             },
             "require-dev": {
                 "psr/log": "~1.0",
-                "symfony/config": "~3.3",
-                "symfony/dependency-injection": "~3.3",
-                "symfony/event-dispatcher": "~2.8|~3.0",
-                "symfony/filesystem": "~2.8|~3.0",
-                "symfony/process": "~2.8|~3.0"
+                "symfony/config": "~3.4|~4.0",
+                "symfony/dependency-injection": "~3.4|~4.0",
+                "symfony/event-dispatcher": "~3.4|~4.0",
+                "symfony/lock": "~3.4|~4.0",
+                "symfony/process": "~3.4|~4.0"
             },
             "suggest": {
                 "psr/log": "For using the console logger",
                 "symfony/event-dispatcher": "",
-                "symfony/filesystem": "",
+                "symfony/lock": "",
                 "symfony/process": ""
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.3-dev"
+                    "dev-master": "4.0-dev"
                 }
             },
             "autoload": {
@@ -1307,85 +1307,29 @@
             ],
             "description": "Symfony Console Component",
             "homepage": "https://symfony.com",
-            "time": "2017-11-16T15:24:32+00:00"
-        },
-        {
-            "name": "symfony/debug",
-            "version": "v3.3.13",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/debug.git",
-                "reference": "74557880e2846b5c84029faa96b834da37e29810"
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-                "php": "^5.5.9|>=7.0.8",
-                "psr/log": "~1.0"
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-            "conflict": {
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-            },
-            "require-dev": {
-                "symfony/http-kernel": "~2.8|~3.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "3.3-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Symfony\\Component\\Debug\\": ""
-                },
-                "exclude-from-classmap": [
-                    "/Tests/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Fabien Potencier",
-                    "email": "fabien@symfony.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony Debug Component",
-            "homepage": "https://symfony.com",
-            "time": "2017-11-10T16:38:39+00:00"
+            "time": "2018-04-03T05:24:00+00:00"
         },
         {
             "name": "symfony/finder",
-            "version": "v3.3.13",
+            "version": "v4.0.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/finder.git",
-                "reference": "138af5ec075d4b1d1bd19de08c38a34bb2d7d880"
+                "reference": "ca27c02b7a3fef4828c998c2ff9ba7aae1641c49"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/finder/zipball/138af5ec075d4b1d1bd19de08c38a34bb2d7d880",
-                "reference": "138af5ec075d4b1d1bd19de08c38a34bb2d7d880",
+                "url": "https://api.github.com/repos/symfony/finder/zipball/ca27c02b7a3fef4828c998c2ff9ba7aae1641c49",
+                "reference": "ca27c02b7a3fef4828c998c2ff9ba7aae1641c49",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.5.9|>=7.0.8"
+                "php": "^7.1.3"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.3-dev"
+                    "dev-master": "4.0-dev"
                 }
             },
             "autoload": {
@@ -1412,7 +1356,7 @@
             ],
             "description": "Symfony Finder Component",
             "homepage": "https://symfony.com",
-            "time": "2017-11-05T15:47:03+00:00"
+            "time": "2018-04-04T05:10:37+00:00"
         },
         {
             "name": "symfony/intl",
@@ -2865,6 +2809,62 @@
             "homepage": "https://github.com/sebastianbergmann/version",
             "time": "2016-10-03T07:35:21+00:00"
         },
+        {
+            "name": "symfony/debug",
+            "version": "v3.3.13",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/debug.git",
+                "reference": "74557880e2846b5c84029faa96b834da37e29810"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/debug/zipball/74557880e2846b5c84029faa96b834da37e29810",
+                "reference": "74557880e2846b5c84029faa96b834da37e29810",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.5.9|>=7.0.8",
+                "psr/log": "~1.0"
+            },
+            "conflict": {
+                "symfony/http-kernel": ">=2.3,<2.3.24|~2.4.0|>=2.5,<2.5.9|>=2.6,<2.6.2"
+            },
+            "require-dev": {
+                "symfony/http-kernel": "~2.8|~3.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.3-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\Debug\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony Debug Component",
+            "homepage": "https://symfony.com",
+            "time": "2017-11-10T16:38:39+00:00"
+        },
         {
             "name": "symfony/yaml",
             "version": "v3.3.13",
@@ -2977,7 +2977,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=5.6"
+        "php": "^7.1.3"
     },
     "platform-dev": []
 }