diff --git a/phpBB/docs/INSTALL.html b/phpBB/docs/INSTALL.html
index 1e73e19cd9..b175b0799c 100644
--- a/phpBB/docs/INSTALL.html
+++ b/phpBB/docs/INSTALL.html
@@ -147,7 +147,7 @@
 			<li>Oracle</li>
 		</ul>
 		</li>
-		<li><strong>PHP 7.3.0+</strong> up to and including <strong>PHP 8.2</strong> with support for the database you intend to use.</li>
+		<li><strong>PHP 8.1.0+</strong> up to and including <strong>PHP 8.2</strong> with support for the database you intend to use.</li>
 		<li>The following PHP modules are required:
 		<ul>
 			<li>json</li>
diff --git a/phpBB/docs/README.html b/phpBB/docs/README.html
index a2355a0e59..966e10020f 100644
--- a/phpBB/docs/README.html
+++ b/phpBB/docs/README.html
@@ -323,11 +323,11 @@
 
 		<div class="content">
 
-	<p>phpBB 3.3.x takes advantage of new features added in PHP 7.1. We recommend that you upgrade to the latest stable release of PHP to run phpBB. The minimum version required is PHP 7.1.3 and the maximum supported version is the latest stable version of PHP.</p>
+	<p>phpBB 4.0.x takes advantage of new features added in PHP 8.1. We recommend that you upgrade to the latest stable release of PHP to run phpBB. The minimum version required is PHP 8.1.0 and the maximum supported version is the latest stable version of PHP.</p>
 
 	<p>Please remember that running any application on a development (unstable, e.g. a beta release) version of PHP can lead to strange/unexpected results which may appear to be bugs in the application. Therefore, we recommend you upgrade to the newest stable version of PHP before running phpBB. If you are running a development 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 MySQLi 4.1.3, 4.x, 5.x, MariaDB 5.x, PostgreSQL 8.x, Oracle 8 and SQLite 3. Versions of PHP used range from 7.1.3 to 7.2.x and 7.3.x without issues.</p>
+	<p>This board has been developed and tested under Linux and Windows (amongst others) running Apache using MySQLi 4.1.3, 4.x, 5.x, MariaDB 5.x, PostgreSQL 8.x, Oracle 8 and SQLite 3. Versions of PHP used range from 8.1.x to 8.2.x and 8.3.x.</p>
 
 <a name="phpsec"></a><h3>7.i. Notice on PHP security issues</h3>
 
diff --git a/phpBB/includes/startup.php b/phpBB/includes/startup.php
index 2f4b291213..dac52a025f 100644
--- a/phpBB/includes/startup.php
+++ b/phpBB/includes/startup.php
@@ -23,11 +23,11 @@ $level = E_ALL & ~E_NOTICE & ~E_DEPRECATED;
 error_reporting($level);
 
 /**
-* Minimum Requirement: PHP 7.3.0
+* Minimum Requirement: PHP 8.1.0
 */
-if (version_compare(PHP_VERSION, '7.3.0', '<'))
+if (version_compare(PHP_VERSION, '8.1.0', '<'))
 {
-	die('You are running an unsupported PHP version (' . PHP_VERSION . '). Please upgrade to PHP 7.3.0 or higher before trying to install or update to phpBB 4.0');
+	die('You are running an unsupported PHP version (' . PHP_VERSION . '). Please upgrade to PHP 8.1.0 or higher before trying to install or update to phpBB 4.0');
 }
 
 // In PHP 5.3.0 the error level has been raised to E_WARNING which causes problems