diff --git a/composer.json b/composer.json
index 6a85396..4dd639e 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"
 	},
 	"extra": {
diff --git a/ext.php b/ext.php
index 41a8b4f..fca74d5 100644
--- a/ext.php
+++ b/ext.php
@@ -52,13 +52,13 @@ 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_topicclaim.php b/language/en/install_topicclaim.php
index f5f5c66..cd63ca3 100644
--- a/language/en/install_topicclaim.php
+++ b/language/en/install_topicclaim.php
@@ -22,5 +22,5 @@
 }
 
 $lang = array_merge($lang, [
-	'TOPICCLAIM_NOT_ENABLEABLE'	=> 'Topic Claim could not be enabled. It needs phpBB 3.3.19 or later and PHP 8.3.36 or later.',
+	'TOPICCLAIM_NOT_ENABLEABLE'	=> 'Topic Claim could not be enabled. It needs phpBB 3.3.19 or later and PHP 8.1 or later.',
 ]);