diff --git a/composer.json b/composer.json
index 53bc609..ff86d42 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
 	"name": "chdemko/bitarray",
 	"type": "library",
-	"description": "BitArray for PHP >= 5.5",
+	"description": "BitArray for PHP >= 8.1",
 	"keywords": ["bits","array","iterator"],
 	"homepage": "http://github.com/chdemko/php-bitarray",
 	"license": "BSD-3-Clause",
@@ -14,7 +14,7 @@
 		}
 	],
 	"require": {
-		"php": ">=5.5.0"
+		"php": ">=8.1"
 	},
 	"require-dev": {
 		"php-coveralls/php-coveralls": "^2.6",
diff --git a/composer.lock b/composer.lock
index 1dd7610..66a8637 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "fd4233a9e598471d2159dcef65ef7656",
+    "content-hash": "d3b9c0cf17ea594a1fc37086531098fe",
     "packages": [],
     "packages-dev": [
         {
@@ -3355,7 +3355,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=5.5.0"
+        "php": ">=8.1"
     },
     "platform-dev": [],
     "plugin-api-version": "2.2.0"