{
    "name": "shopifyextras/shopify-php-api-wrapper",
    "description": "Shopify PHP (Guzzle) API Wrapper",
    "type": "library",
    "license": "MIT",
    "version": "1.1.2",
    "homepage": "http://www.shopifyextras.com",
    "authors": [
        {
            "name": "Andrew Cargill",
            "email": "help@shopifyextras.com"
        }
    ],
    "require-dev": {
        "phpunit/phpunit": "~4.2"
    },
    "require": {
        "php": ">=5.4",
        "guzzlehttp/guzzle": "~5.3|~6.0",
        "guzzlehttp/guzzle-services": "0.5.0",
        "guzzlehttp/command": "0.7.0"
    },
    "autoload": {
        "psr-4": {
            "Shopify\\": "src/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Shopify\\Tests\\": "tests/"
        }
    },
    "minimum-stability": "stable"
}

{
    "name": "shopifyextras/shopify-php-api-wrapper",
    "description": "Shopify PHP (Guzzle) API Wrapper",
    "type": "library",
    "license": "MIT",
    "version": "1.1.2",
    "homepage": "http://www.shopifyextras.com",
    "authors": [
        {
            "name": "Andrew Cargill",
            "email": "help@shopifyextras.com"
        }
    ],
    "require-dev": {
        "phpunit/phpunit": "~4.2"
    },
    "require": {
        "php": ">=5.4",
        "guzzlehttp/guzzle": "~6.0",
        "guzzlehttp/guzzle-services": "~1.1.0",
        "guzzlehttp/command": "~1.0.0"
    },
    "autoload": {
        "psr-4": {
            "Shopify\\": "src/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Shopify\\Tests\\": "tests/"
        }
    },
    "minimum-stability": "stable"
}

Update Guzzle Dependencies to the newest versions
Update Guzzle Dependencies to the newest versions

Tested the package with the newest versions of Guzzle packages. Everything working fine.