diff --git a/.gitignore b/.gitignore
index 845ae90..b113232 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,4 @@
 .vagrant
-composer.lock
 phpunit.xml
 tests/report
 vendor
diff --git a/.travis.yml b/.travis.yml
index e28dab3..55cef3f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,13 +3,13 @@ language: php
 sudo: false
 
 php:
-  - 5.4
   - 5.5
   - 5.6
   - 7.0
+  - 7.1
 
-install:
-  - travis_retry composer install --no-interaction --optimize-autoloader --prefer-source
+before_script:
+  - travis_retry composer update --no-interaction
 
 script:
   - make tests
diff --git a/README.md b/README.md
index 22272cd..0c6b376 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 [![Latest Stable Version](http://img.shields.io/packagist/v/graze/monolog-extensions.svg?style=flat)][packagist]
 [![Build Status](http://img.shields.io/travis/graze/monolog-extensions/master.svg?style=flat)][travis]
-[![Minimum PHP Version](http://img.shields.io/badge/php-~5.4-8892BF.svg?style=flat)][php]
+[![Minimum PHP Version](http://img.shields.io/badge/php-~5.5-8892BF.svg?style=flat)][php]
 
 [travis]:    https://travis-ci.org/graze/monolog-extensions
 [packagist]: https://packagist.org/packages/graze/monolog-extensions
diff --git a/composer.json b/composer.json
index 0e76d1b..4fedb61 100644
--- a/composer.json
+++ b/composer.json
@@ -19,11 +19,11 @@
     },
     "require-dev": {
         "adlawson/timezone": "~1.0",
-        "aws/aws-sdk-php": "~2.4",
-        "mockery/mockery": "~0.9",
-        "phpunit/phpunit": "~4.0",
+        "aws/aws-sdk-php": "^3.0",
+        "filp/whoops": "~1.0",
         "mindscape/raygun4php": "dev-master",
-        "filp/whoops": "~1.0"
+        "mockery/mockery": "~0.9",
+        "phpunit/phpunit": "~4.0"
     },
     "suggest": {
         "aws/aws-sdk-php": "Write records to AWS services like DynamoDb",
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..a5b73a2
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,1891 @@
+{
+    "_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",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "5911932a258818762fd0b315355d47fd",
+    "packages": [
+        {
+            "name": "monolog/monolog",
+            "version": "1.23.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/Seldaek/monolog.git",
+                "reference": "fd8c787753b3a2ad11bc60c063cff1358a32a3b4"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/Seldaek/monolog/zipball/fd8c787753b3a2ad11bc60c063cff1358a32a3b4",
+                "reference": "fd8c787753b3a2ad11bc60c063cff1358a32a3b4",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.0",
+                "psr/log": "~1.0"
+            },
+            "provide": {
+                "psr/log-implementation": "1.0.0"
+            },
+            "require-dev": {
+                "aws/aws-sdk-php": "^2.4.9 || ^3.0",
+                "doctrine/couchdb": "~1.0@dev",
+                "graylog2/gelf-php": "~1.0",
+                "jakub-onderka/php-parallel-lint": "0.9",
+                "php-amqplib/php-amqplib": "~2.4",
+                "php-console/php-console": "^3.1.3",
+                "phpunit/phpunit": "~4.5",
+                "phpunit/phpunit-mock-objects": "2.3.0",
+                "ruflin/elastica": ">=0.90 <3.0",
+                "sentry/sentry": "^0.13",
+                "swiftmailer/swiftmailer": "^5.3|^6.0"
+            },
+            "suggest": {
+                "aws/aws-sdk-php": "Allow sending log messages to AWS services like DynamoDB",
+                "doctrine/couchdb": "Allow sending log messages to a CouchDB server",
+                "ext-amqp": "Allow sending log messages to an AMQP server (1.0+ required)",
+                "ext-mongo": "Allow sending log messages to a MongoDB server",
+                "graylog2/gelf-php": "Allow sending log messages to a GrayLog2 server",
+                "mongodb/mongodb": "Allow sending log messages to a MongoDB server via PHP Driver",
+                "php-amqplib/php-amqplib": "Allow sending log messages to an AMQP server using php-amqplib",
+                "php-console/php-console": "Allow sending log messages to Google Chrome",
+                "rollbar/rollbar": "Allow sending log messages to Rollbar",
+                "ruflin/elastica": "Allow sending log messages to an Elastic Search server",
+                "sentry/sentry": "Allow sending log messages to a Sentry server"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Monolog\\": "src/Monolog"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be",
+                    "homepage": "http://seld.be"
+                }
+            ],
+            "description": "Sends your logs to files, sockets, inboxes, databases and various web services",
+            "homepage": "http://github.com/Seldaek/monolog",
+            "keywords": [
+                "log",
+                "logging",
+                "psr-3"
+            ],
+            "time": "2017-06-19T01:22:40+00:00"
+        },
+        {
+            "name": "psr/log",
+            "version": "1.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/log.git",
+                "reference": "4ebe3a8bf773a19edfe0a84b6585ba3d401b724d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-fig/log/zipball/4ebe3a8bf773a19edfe0a84b6585ba3d401b724d",
+                "reference": "4ebe3a8bf773a19edfe0a84b6585ba3d401b724d",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Psr\\Log\\": "Psr/Log/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "http://www.php-fig.org/"
+                }
+            ],
+            "description": "Common interface for logging libraries",
+            "homepage": "https://github.com/php-fig/log",
+            "keywords": [
+                "log",
+                "psr",
+                "psr-3"
+            ],
+            "time": "2016-10-10T12:19:37+00:00"
+        }
+    ],
+    "packages-dev": [
+        {
+            "name": "adlawson/timezone",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/adlawson/php-timezone.git",
+                "reference": "6b0a7300e0ce5670b2f472e934c0f0c714ab09be"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/adlawson/php-timezone/zipball/6b0a7300e0ce5670b2f472e934c0f0c714ab09be",
+                "reference": "6b0a7300e0ce5670b2f472e934c0f0c714ab09be",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "./lib/timezone.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Andrew Lawson",
+                    "homepage": "http://adlawson.com"
+                }
+            ],
+            "description": "UTC default timezone",
+            "homepage": "http://github.com/adlawson/timezone",
+            "keywords": [
+                "date",
+                "datetime",
+                "default",
+                "time",
+                "timezone",
+                "utc"
+            ],
+            "time": "2013-08-16T12:43:22+00:00"
+        },
+        {
+            "name": "aws/aws-sdk-php",
+            "version": "3.33.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/aws/aws-sdk-php.git",
+                "reference": "586a9c0e52664cfc4d2d91f9dcdf3ea48d143162"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/aws/aws-sdk-php/zipball/586a9c0e52664cfc4d2d91f9dcdf3ea48d143162",
+                "reference": "586a9c0e52664cfc4d2d91f9dcdf3ea48d143162",
+                "shasum": ""
+            },
+            "require": {
+                "guzzlehttp/guzzle": "^5.3.1|^6.2.1",
+                "guzzlehttp/promises": "~1.0",
+                "guzzlehttp/psr7": "^1.4.1",
+                "mtdowling/jmespath.php": "~2.2",
+                "php": ">=5.5"
+            },
+            "require-dev": {
+                "andrewsville/php-token-reflection": "^1.4",
+                "aws/aws-php-sns-message-validator": "~1.0",
+                "behat/behat": "~3.0",
+                "doctrine/cache": "~1.4",
+                "ext-dom": "*",
+                "ext-json": "*",
+                "ext-openssl": "*",
+                "ext-pcre": "*",
+                "ext-simplexml": "*",
+                "ext-spl": "*",
+                "nette/neon": "^2.3",
+                "phpunit/phpunit": "^4.8.35|^5.4.0",
+                "psr/cache": "^1.0"
+            },
+            "suggest": {
+                "aws/aws-php-sns-message-validator": "To validate incoming SNS notifications",
+                "doctrine/cache": "To use the DoctrineCacheAdapter",
+                "ext-curl": "To send requests using cURL",
+                "ext-openssl": "Allows working with CloudFront private distributions and verifying received SNS messages"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Aws\\": "src/"
+                },
+                "files": [
+                    "src/functions.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "Apache-2.0"
+            ],
+            "authors": [
+                {
+                    "name": "Amazon Web Services",
+                    "homepage": "http://aws.amazon.com"
+                }
+            ],
+            "description": "AWS SDK for PHP - Use Amazon Web Services in your PHP project",
+            "homepage": "http://aws.amazon.com/sdkforphp",
+            "keywords": [
+                "amazon",
+                "aws",
+                "cloud",
+                "dynamodb",
+                "ec2",
+                "glacier",
+                "s3",
+                "sdk"
+            ],
+            "time": "2017-08-21T20:34:30+00:00"
+        },
+        {
+            "name": "doctrine/instantiator",
+            "version": "1.0.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/doctrine/instantiator.git",
+                "reference": "8e884e78f9f0eb1329e445619e04456e64d8051d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/8e884e78f9f0eb1329e445619e04456e64d8051d",
+                "reference": "8e884e78f9f0eb1329e445619e04456e64d8051d",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3,<8.0-DEV"
+            },
+            "require-dev": {
+                "athletic/athletic": "~0.1.8",
+                "ext-pdo": "*",
+                "ext-phar": "*",
+                "phpunit/phpunit": "~4.0",
+                "squizlabs/php_codesniffer": "~2.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Marco Pivetta",
+                    "email": "ocramius@gmail.com",
+                    "homepage": "http://ocramius.github.com/"
+                }
+            ],
+            "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
+            "homepage": "https://github.com/doctrine/instantiator",
+            "keywords": [
+                "constructor",
+                "instantiate"
+            ],
+            "time": "2015-06-14T21:17:01+00:00"
+        },
+        {
+            "name": "filp/whoops",
+            "version": "1.1.10",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/filp/whoops.git",
+                "reference": "72538eeb70bbfb11964412a3d098d109efd012f7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/filp/whoops/zipball/72538eeb70bbfb11964412a3d098d109efd012f7",
+                "reference": "72538eeb70bbfb11964412a3d098d109efd012f7",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.0"
+            },
+            "require-dev": {
+                "mockery/mockery": "0.9.*"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.2-dev"
+                }
+            },
+            "autoload": {
+                "psr-0": {
+                    "Whoops": "src/"
+                },
+                "classmap": [
+                    "src/deprecated"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Filipe Dobreira",
+                    "homepage": "https://github.com/filp",
+                    "role": "Developer"
+                }
+            ],
+            "description": "php error handling for cool kids",
+            "homepage": "https://github.com/filp/whoops",
+            "keywords": [
+                "error",
+                "exception",
+                "handling",
+                "library",
+                "silex-provider",
+                "whoops",
+                "zf2"
+            ],
+            "time": "2015-06-29T05:42:04+00:00"
+        },
+        {
+            "name": "guzzlehttp/guzzle",
+            "version": "6.3.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/guzzle/guzzle.git",
+                "reference": "f4db5a78a5ea468d4831de7f0bf9d9415e348699"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/f4db5a78a5ea468d4831de7f0bf9d9415e348699",
+                "reference": "f4db5a78a5ea468d4831de7f0bf9d9415e348699",
+                "shasum": ""
+            },
+            "require": {
+                "guzzlehttp/promises": "^1.0",
+                "guzzlehttp/psr7": "^1.4",
+                "php": ">=5.5"
+            },
+            "require-dev": {
+                "ext-curl": "*",
+                "phpunit/phpunit": "^4.0 || ^5.0",
+                "psr/log": "^1.0"
+            },
+            "suggest": {
+                "psr/log": "Required for using the Log middleware"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "6.2-dev"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "src/functions_include.php"
+                ],
+                "psr-4": {
+                    "GuzzleHttp\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                }
+            ],
+            "description": "Guzzle is a PHP HTTP client library",
+            "homepage": "http://guzzlephp.org/",
+            "keywords": [
+                "client",
+                "curl",
+                "framework",
+                "http",
+                "http client",
+                "rest",
+                "web service"
+            ],
+            "time": "2017-06-22T18:50:49+00:00"
+        },
+        {
+            "name": "guzzlehttp/promises",
+            "version": "v1.3.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/guzzle/promises.git",
+                "reference": "a59da6cf61d80060647ff4d3eb2c03a2bc694646"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/guzzle/promises/zipball/a59da6cf61d80060647ff4d3eb2c03a2bc694646",
+                "reference": "a59da6cf61d80060647ff4d3eb2c03a2bc694646",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.5.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.4-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "GuzzleHttp\\Promise\\": "src/"
+                },
+                "files": [
+                    "src/functions_include.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                }
+            ],
+            "description": "Guzzle promises library",
+            "keywords": [
+                "promise"
+            ],
+            "time": "2016-12-20T10:07:11+00:00"
+        },
+        {
+            "name": "guzzlehttp/psr7",
+            "version": "1.4.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/guzzle/psr7.git",
+                "reference": "f5b8a8512e2b58b0071a7280e39f14f72e05d87c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/f5b8a8512e2b58b0071a7280e39f14f72e05d87c",
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+                "shasum": ""
+            },
+            "require": {
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+                "psr/http-message": "~1.0"
+            },
+            "provide": {
+                "psr/http-message-implementation": "1.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~4.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.4-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "GuzzleHttp\\Psr7\\": "src/"
+                },
+                "files": [
+                    "src/functions_include.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Tobias Schultze",
+                    "homepage": "https://github.com/Tobion"
+                }
+            ],
+            "description": "PSR-7 message implementation that also provides common utility methods",
+            "keywords": [
+                "http",
+                "message",
+                "request",
+                "response",
+                "stream",
+                "uri",
+                "url"
+            ],
+            "time": "2017-03-20T17:10:46+00:00"
+        },
+        {
+            "name": "hamcrest/hamcrest-php",
+            "version": "v1.2.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/hamcrest/hamcrest-php.git",
+                "reference": "b37020aa976fa52d3de9aa904aa2522dc518f79c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/hamcrest/hamcrest-php/zipball/b37020aa976fa52d3de9aa904aa2522dc518f79c",
+                "reference": "b37020aa976fa52d3de9aa904aa2522dc518f79c",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.2"
+            },
+            "replace": {
+                "cordoval/hamcrest-php": "*",
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+    "platform-dev": []
+}
diff --git a/src/Graze/Monolog/Handler/SnsEventHandler.php b/src/Graze/Monolog/Handler/SnsEventHandler.php
index 604aabd..caa5d38 100644
--- a/src/Graze/Monolog/Handler/SnsEventHandler.php
+++ b/src/Graze/Monolog/Handler/SnsEventHandler.php
@@ -12,7 +12,6 @@
  */
 namespace Graze\Monolog\Handler;
 
-use Aws\Common\Aws;
 use Aws\Sns\SnsClient;
 use Graze\Monolog\Formatter\JsonDateAwareFormatter;
 use Monolog\Handler\AbstractProcessingHandler;
@@ -26,12 +25,6 @@ class SnsEventHandler extends AbstractProcessingHandler
      * @param string $topic  aws TopicArn
      */
     public function __construct(SnsClient $client, $topic) {
-        if (!defined('Aws\Common\Aws::VERSION') || version_compare('3.0', Aws::VERSION, '<=')) {
-            throw new \RuntimeException(
-                'The SnsHandler is only known to work with the AWS SDK 2.x releases'
-            );
-        }
-
         $this->client = $client;
         $this->topic = $topic;
         parent::__construct();
diff --git a/tests/unit/src/Graze/Monolog/Handler/DynamoDbEventHandlerTest.php b/tests/unit/src/Graze/Monolog/Handler/DynamoDbEventHandlerTest.php
index 8085940..e80ed6e 100644
--- a/tests/unit/src/Graze/Monolog/Handler/DynamoDbEventHandlerTest.php
+++ b/tests/unit/src/Graze/Monolog/Handler/DynamoDbEventHandlerTest.php
@@ -42,7 +42,11 @@ public function testHandle()
     {
         $record = $this->getRecord();
         $formatter = $this->getMock('Monolog\Formatter\FormatterInterface');
-        $formatted = array('foo' => 1, 'bar' => 2);
+        $raw = ['foo' => 1, 'bar' => 2];
+        $formatted = [
+            'foo' => ['N' => '1'],
+            'bar' => ['N' => '2']
+        ];
         $handler = new DynamoDbEventHandler($this->client, 'foo');
         $handler->setFormatter($formatter);
 
@@ -50,12 +54,7 @@ public function testHandle()
              ->expects($this->once())
              ->method('format')
              ->with($record)
-             ->will($this->returnValue($formatted));
-        $this->client
-             ->expects($this->once())
-             ->method('formatAttributes')
-             ->with($this->isType('array'))
-             ->will($this->returnValue($formatted));
+             ->will($this->returnValue($raw));
         $this->client
              ->expects($this->once())
              ->method('__call')