diff --git a/doc/overview.rst b/doc/overview.rst
index c9126173c..b6dd296b1 100644
--- a/doc/overview.rst
+++ b/doc/overview.rst
@@ -21,11 +21,11 @@ System Requirements
 The basic requirements to operate Swift Mailer are extremely minimal and
 easily achieved. Historically, Swift Mailer has supported both PHP 4 and PHP 5
 by following a parallel development workflow. Now in it's fourth major
-version, and Swift Mailer operates on servers running PHP 5.2 or higher.
+version, and Swift Mailer operates on servers running PHP 5.3.3 or higher.
 
 The library aims to work with as many PHP 5 projects as possible:
 
-* PHP 5.2 or higher, with the SPL extension (standard)
+* PHP 5.3.3 or higher, with the SPL extension (standard)
 
 * Limited network access to connect to remote SMTP servers