diff --git a/.travis.yml b/.travis.yml
index 56133049..2de1aa7c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,7 @@
 language: php
 
 php:
+  - 5.3.3
   - 5.3
   - 5.4
   - 5.5
diff --git a/README.md b/README.md
index 399c845b..b46cd0f0 100755
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ __Want to contribute?__ Fork us!
 * ... and many more features on progress
 
 ## Requirements
-* PHP 5.3+
+* PHP 5.3.3+
 * PHP [Zip](http://php.net/manual/en/book.zip.php) extension
 * PHP [XML Parser](http://www.php.net/manual/en/xml.installation.php) extension
 
diff --git a/composer.json b/composer.json
index 7911e7af..b62a3834 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
         }
     ],
     "require": {
-        "php": ">=5.3.0",
+        "php": ">=5.3.3",
         "ext-xml": "*",
         "ext-zip": "*"
     },