diff --git a/.travis.yml b/.travis.yml
index 260de0a..77a60dd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,6 @@ php:
 - "5.6"
 - "5.5"
 - "5.4"
-- "5.3"
 - "hhvm"
 
 sudo: false
diff --git a/composer.json b/composer.json
index 868b9ce..fb88c0d 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,8 @@
     },
     "require": {
         "phpseclib/phpseclib": "^2.0",
-        "defuse/php-encryption": "^1.2"
+        "defuse/php-encryption": "^1.2",
+        "sarciszewski/php-future": "^0.4"
     },
     "require-dev": {
         "phpunit/phpunit":  "4.*|5.*"