diff --git a/composer.json b/composer.json
index ed633ba..963cae2 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
 		}
 	],
 	"require": {
-		"php": ">=8.3.36",
+		"php": ">=8.1.0",
 		"composer/installers": "^1.0 || ^2.0"
 	},
 	"require-dev": {
diff --git a/ext.php b/ext.php
index b643204..27e18ff 100644
--- a/ext.php
+++ b/ext.php
@@ -48,13 +48,13 @@ public function check_phpbb_version()
 	}
 
 	/**
-	 * Requires PHP 8.3.36 due to security fixes.
+	 * Requires PHP 8.1.0 or later.
 	 *
 	 * @return bool
 	 */
 	public function check_php_version()
 	{
-		return PHP_VERSION_ID >= 80336;
+		return PHP_VERSION_ID >= 80100;
 	}
 
 	/**
diff --git a/language/en/install_documentation.php b/language/en/install_documentation.php
index 44dbb17..39c50b6 100644
--- a/language/en/install_documentation.php
+++ b/language/en/install_documentation.php
@@ -38,5 +38,5 @@
 //
 
 $lang = array_merge($lang, array(
-	'DOCUMENTATION_NOT_ENABLEABLE'	=> 'Documentation could not be enabled. It requires phpBB 3.3.19 or a later 3.3 release, and PHP 8.3.36 or later.',
+	'DOCUMENTATION_NOT_ENABLEABLE'	=> 'Documentation could not be enabled. It requires phpBB 3.3.19 or a later 3.3 release, and PHP 8.1 or later.',
 ));