diff --git a/.travis.yml b/.travis.yml
index d47b226b..7c51a022 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: php
 
 php:
-    - 5.3
+    - 5.5
     - 5.6
     - 7.0
 
diff --git a/README.md b/README.md
index ef5b9581..d057a6f8 100644
--- a/README.md
+++ b/README.md
@@ -17,36 +17,30 @@ Proprietary, see the provided `license.md`.
 - JSON PHP Extension
 - SimpleXML PHP Extension
 - An Authorize.Net Merchant Account or Sandbox Account. You can get a 
-	free sandbox account at http://developer.authorize.net/sandbox/
+	free sandbox account at http://developer.authorize.net/hello_world/sandbox/
 
 ## Autoloading
 
-[`Composer`](http://getcomposer.org) currently has a [MITM](https://github.com/composer/composer/issues/1074)
-security vulnerability.  However, if you wish to use it, require its autoloader in
+We recommend using [`Composer`](http://getcomposer.org) *(note we never recommend you override the new secure-http default setting)*, don't forget to require its autoloader in
 your script or bootstrap file:
 ```php
 require 'vendor/autoload.php';
 ```
-*Note: you'll need a composer.json file with the following require section and to run
+*Update your composer.json file as per the example below and then run
 `composer update`.*
 
 ```json
 {
   "require": {
-  "php": ">=5.2.0",
+  "php": ">=5.5",
   "ext-curl": "*",
-  "authorizenet/authorizenet": "1.8.8",
-  "jms/serializer": "xsd2php-dev as 0.18.0"
-},
-"require-dev": {
-  "goetas/xsd2php": "2.*@dev",
-  "goetas/xsd-reader": "2.*@dev"
-},
-"repositories": [{
-    "type": "vcs",
-    "url": "https://github.com/goetas/serializer.git"
-    }]
-
+  "authorizenet/authorizenet": "1.8.9",
+  "jms/serializer": "serializer-master-dev as 1.0"
+  },
+  "repositories": [{
+       "type": "vcs",
+       "url": "https://github.com/goetas/serializer.git"
+  }]
 }
 ```
 
diff --git a/composer.json b/composer.json
index 813bdfca..006cf744 100644
--- a/composer.json
+++ b/composer.json
@@ -6,7 +6,7 @@
     "license": "proprietary",
     "homepage": "http://developer.authorize.net",
     "require": {
-        "php": "~5.3 || ~7.0",
+        "php": ">=5.5",
         "ext-curl": "*",
         "ext-json": "*",
         "ext-simplexml": "*",