diff --git a/README.md b/README.md
index a806b2a..4d1d243 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ Click an image for the full size. See the [screenshot gallery](docs/images/scree
 ## Requirements
 
 - phpBB 3.3.19 or later, including phpBB 4.0 (tested on its 4.0.0-a3 development version)
-- PHP 8.3.36 or later
+- PHP 8.1 or later
 
 ## Installation
 
diff --git a/composer.json b/composer.json
index cabcb24..d4af2de 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
 		}
 	],
 	"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 b67cbe3..8552440 100644
--- a/ext.php
+++ b/ext.php
@@ -72,13 +72,13 @@ 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_contactadmin.php b/language/en/install_contactadmin.php
index d4ac0e3..bc9411b 100644
--- a/language/en/install_contactadmin.php
+++ b/language/en/install_contactadmin.php
@@ -38,6 +38,6 @@
 //
 
 $lang = array_merge($lang, [
-	'CONTACTADMIN_NOT_ENABLEABLE'	=> 'Contact Admin could not be enabled. The minimum requirements of phpBB 3.3.19 and/or PHP 8.3.36 were not satisfied.',
+	'CONTACTADMIN_NOT_ENABLEABLE'	=> 'Contact Admin could not be enabled. The minimum requirements of phpBB 3.3.19 and/or PHP 8.1 were not satisfied.',
 	'CONTACTADMIN_DISABLE_OLD'	=> 'Disable the old “%s” extension first. Keep its data; do not delete it.',
 ]);