diff --git a/phpBB/common.php b/phpBB/common.php
index 9697ed57ee..54e7093c76 100644
--- a/phpBB/common.php
+++ b/phpBB/common.php
@@ -6,7 +6,7 @@
 * @copyright (c) 2005 phpBB Group
 * @license http://opensource.org/licenses/gpl-license.php GNU Public License
 *
-* Minimum Requirement: PHP 4.3.3
+* Minimum Requirement: PHP 5.2.0
 */
 
 /**
diff --git a/phpBB/docs/INSTALL.html b/phpBB/docs/INSTALL.html
index 3c3ccf9f28..60018a4f13 100644
--- a/phpBB/docs/INSTALL.html
+++ b/phpBB/docs/INSTALL.html
@@ -145,7 +145,7 @@
 			<li>Oracle</li>
 		</ul>
 		</li>
-		<li><strong>PHP 4.3.3+ (>=4.3.3, >4.4.x, >5.x.x, >6.0-dev (compatible))</strong> with support for the database you intend to use.</li>
+		<li><strong>PHP 5.2.0+</strong> with support for the database you intend to use.</li>
 		<li>getimagesize() function need to be enabled.</li>
 		<li>These optional presence of the following modules within PHP will provide access to additional features, but they are not required.
 		<ul>
diff --git a/phpBB/docs/README.html b/phpBB/docs/README.html
index 7a0a42b34f..a4796b84eb 100644
--- a/phpBB/docs/README.html
+++ b/phpBB/docs/README.html
@@ -313,11 +313,11 @@
 
 		<div class="content">
 
-	<p>phpBB is no longer supported on PHP3 due to several compatibility issues and we recommend that you upgrade to the latest stable release of PHP5 to run phpBB. The minimum version required is PHP 4.3.3.</p>
+	<p>phpBB is no longer supported on PHP4 due to several compatibility issues and we recommend that you upgrade to the latest stable release of PHP5 to run phpBB. The minimum version required is PHP 5.2.0.</p>
 
 	<p>Please remember that running any application on a developmental version of PHP can lead to strange/unexpected results which may appear to be bugs in the application (which may not be true). Therefore we recommend you upgrade to the newest stable version of PHP before running phpBB3. If you are running a developmental version of PHP please check any bugs you find on a system running a stable release before submitting.</p>
 
-	<p>This board has been developed and tested under Linux and Windows (amongst others) running Apache using MySQL 3.23, 4.x, 5.x, MSSQL Server 2000, PostgreSQL 7.x, Oracle 8, SQLite and Firebird. Versions of PHP used range from 4.3.3 to 6.0.0-dev without problem. </p>
+	<p>This board has been developed and tested under Linux and Windows (amongst others) running Apache using MySQL 3.23, 4.x, 5.x, MSSQL Server 2000, PostgreSQL 7.x, Oracle 8, SQLite and Firebird. Versions of PHP used range from 5.2.0 to 5.3.x without problem.</p>
 
 <a name="phpsec"></a><h3>7.i. Notice on PHP security issues</h3>
 
diff --git a/phpBB/docs/coding-guidelines.html b/phpBB/docs/coding-guidelines.html
index 8365e3c301..12cbbc2caa 100644
--- a/phpBB/docs/coding-guidelines.html
+++ b/phpBB/docs/coding-guidelines.html
@@ -2362,7 +2362,7 @@ if (utf8_case_fold_nfc($string1) == utf8_case_fold_nfc($string2))
 
 	<div class="codebox"><pre>
 	...
-'FOO_BAR'	=&gt;	'PHP version &lt; 4.3.3.&lt;br /&gt;
+'FOO_BAR'	=&gt;	'PHP version &lt; 5.2.0.&lt;br /&gt;
 	Visit &quot;Downloads&quot; at &lt;a href=&quot;http://www.php.net/&quot;&gt;www.php.net&lt;/a&gt;.',
 	...
 	</pre></div>
@@ -2371,7 +2371,7 @@ if (utf8_case_fold_nfc($string1) == utf8_case_fold_nfc($string2))
 
 	<div class="codebox"><pre>
 	...
-'FOO_BAR'	=&gt;	'PHP version &amp;lt; 4.3.3.&lt;br /&gt;
+'FOO_BAR'	=&gt;	'PHP version &amp;lt; 5.2.0.&lt;br /&gt;
 	Visit &amp;quot;Downloads&amp;quot; at &lt;a href=&quot;http://www.php.net/&quot;&gt;www.php.net&lt;/a&gt;.',
 	...
 	</pre></div>
@@ -2380,7 +2380,7 @@ if (utf8_case_fold_nfc($string1) == utf8_case_fold_nfc($string2))
 
 	<div class="codebox"><pre>
 	...
-'FOO_BAR'	=&gt;	'PHP version &amp;lt; 4.3.3.&lt;br /&gt;
+'FOO_BAR'	=&gt;	'PHP version &amp;lt; 5.2.0.&lt;br /&gt;
 	Visit &ldquo;Downloads&rdquo; at &lt;a href=&quot;http://www.php.net/&quot;&gt;www.php.net&lt;/a&gt;.',
 	...
 	</pre></div>
diff --git a/phpBB/install/index.php b/phpBB/install/index.php
index e8a63e857e..cd3c8fbaa8 100644
--- a/phpBB/install/index.php
+++ b/phpBB/install/index.php
@@ -18,10 +18,9 @@ define('IN_INSTALL', true);
 $phpbb_root_path = (defined('PHPBB_ROOT_PATH')) ? PHPBB_ROOT_PATH : './../';
 $phpEx = substr(strrchr(__FILE__, '.'), 1);
 
-// @todo Review this test and see if we can find out what it is which prevents PHP 4.2.x from even displaying the page with requirements on it
-if (version_compare(PHP_VERSION, '4.3.3') < 0)
+if (version_compare(PHP_VERSION, '5.2.0') < 0)
 {
-	die('You are running an unsupported PHP version. Please upgrade to PHP 4.3.3 or higher before trying to install phpBB 3.0');
+	die('You are running an unsupported PHP version. Please upgrade to PHP 5.2.0 or higher before trying to install phpBB 3.1');
 }
 
 function phpbb_require_updated($path, $optional = false)
diff --git a/phpBB/install/install_install.php b/phpBB/install/install_install.php
index e18ed43778..e36fc1c618 100644
--- a/phpBB/install/install_install.php
+++ b/phpBB/install/install_install.php
@@ -141,7 +141,7 @@ class install_install extends module
 		// Test the minimum PHP version
 		$php_version = PHP_VERSION;
 
-		if (version_compare($php_version, '4.3.3') < 0)
+		if (version_compare($php_version, '5.2.0') < 0)
 		{
 			$result = '<strong style="color:red">' . $lang['NO'] . '</strong>';
 		}
diff --git a/phpBB/language/en/install.php b/phpBB/language/en/install.php
index bc5a3ab936..2859b05909 100644
--- a/phpBB/language/en/install.php
+++ b/phpBB/language/en/install.php
@@ -300,10 +300,10 @@ $lang = array_merge($lang, array(
 	'PHP_REGISTER_GLOBALS_EXPLAIN'	=> 'phpBB will still run if this setting is enabled, but if possible, it is recommended that register_globals is disabled on your PHP install for security reasons.',
 	'PHP_SAFE_MODE'					=> 'Safe mode',
 	'PHP_SETTINGS'					=> 'PHP version and settings',
-	'PHP_SETTINGS_EXPLAIN'			=> '<strong>Required</strong> - You must be running at least version 4.3.3 of PHP in order to install phpBB. If <var>safe mode</var> is displayed below your PHP installation is running in that mode. This will impose limitations on remote administration and similar features.',
+	'PHP_SETTINGS_EXPLAIN'			=> '<strong>Required</strong> - You must be running at least version 5.2.0 of PHP in order to install phpBB. If <var>safe mode</var> is displayed below your PHP installation is running in that mode. This will impose limitations on remote administration and similar features.',
 	'PHP_URL_FOPEN_SUPPORT'			=> 'PHP setting <var>allow_url_fopen</var> is enabled',
 	'PHP_URL_FOPEN_SUPPORT_EXPLAIN'	=> '<strong>Optional</strong> - This setting is optional, however certain phpBB functions like off-site avatars will not work properly without it.',
-	'PHP_VERSION_REQD'				=> 'PHP version >= 4.3.3',
+	'PHP_VERSION_REQD'				=> 'PHP version >= 5.2.0',
 	'POST_ID'						=> 'Post ID',
 	'PREFIX_FOUND'					=> 'A scan of your tables has shown a valid installation using <strong>%s</strong> as table prefix.',
 	'PREPROCESS_STEP'				=> 'Executing pre-processing functions/queries',