diff --git a/composer.json b/composer.json
index ab1b7bb..cc4ed62 100644
--- a/composer.json
+++ b/composer.json
@@ -27,7 +27,7 @@
 		}
 	],
 	"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 6128c35..637d39c 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_editedpostsunread.php b/language/en/install_editedpostsunread.php
index 889cf5d..592682a 100644
--- a/language/en/install_editedpostsunread.php
+++ b/language/en/install_editedpostsunread.php
@@ -39,6 +39,6 @@
 //
 
 $lang = array_merge($lang, [
-	'EDITEDPOSTSUNREAD_NOT_ENABLEABLE'	=> 'Mark Edited Posts Unread could not be enabled. The minimum requirements of phpBB 3.3.19 and/or PHP 8.3.36 were not satisfied.',
+	'EDITEDPOSTSUNREAD_NOT_ENABLEABLE'	=> 'Mark Edited Posts Unread could not be enabled. The minimum requirements of phpBB 3.3.19 and/or PHP 8.1 were not satisfied.',
 	'EDITEDPOSTSUNREAD_DISABLE_OLD'	=> 'Disable the old “%s” extension first. Keep its data; do not delete it.',
 ]);