diff --git a/composer.json b/composer.json
index 8a0bba4..d4ec186 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,7 @@
         }
     ],
     "require": {
-        "php": ">=8.3.36",
+        "php": ">=8.1.0",
         "composer/installers": "^1.0 || ^2.0"
 	},
     "extra": {
diff --git a/ext.php b/ext.php
index d23dd0e..e9915bd 100644
--- a/ext.php
+++ b/ext.php
@@ -49,12 +49,12 @@ protected function check_phpbb_version()
 	}
 
 	/**
-	 * Requires PHP 8.3.36 due to security fixes.
+	 * Requires PHP 8.1.0 or later.
 	 *
 	 * @return bool
 	 */
 	protected function check_php_version()
 	{
-		return PHP_VERSION_ID >= 80336;
+		return PHP_VERSION_ID >= 80100;
 	}
 }
diff --git a/language/en/activationjustification_install.php b/language/en/activationjustification_install.php
index 4e718c1..22444ae 100644
--- a/language/en/activationjustification_install.php
+++ b/language/en/activationjustification_install.php
@@ -16,5 +16,5 @@
 }
 
 $lang = array_merge($lang, array(
-	'ACTIVATIONJUSTIFICATION_NOT_ENABLEABLE' => 'Activation Justification could not be enabled. It requires phpBB 3.3.19 or later and PHP 8.3.36 or later.',
+	'ACTIVATIONJUSTIFICATION_NOT_ENABLEABLE' => 'Activation Justification could not be enabled. It requires phpBB 3.3.19 or later and PHP 8.1 or later.',
 ));