diff --git a/.travis.yml b/.travis.yml
index 79178e0..fadbf8c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,6 @@
 language: php
  
 php:
-  - 5.4
   - 5.5
   - 5.6
   - 7.0
diff --git a/composer.json b/composer.json
index 8c6fccc..6e8618b 100644
--- a/composer.json
+++ b/composer.json
@@ -2,7 +2,7 @@
     "name": "mailgun/mailgun-php",
     "description": "The Mailgun SDK provides methods for all API functions.",
     "require": {
-        "php": ">=5.4.0",
+        "php": "^5.5|^7.0",
         "guzzlehttp/psr7": "~1.2",
         "php-http/httplug": "^1.0",
         "php-http/client-implementation": "^1.0",