diff --git a/composer.json b/composer.json
index 1dfcc9a9..7e27f8a1 100644
--- a/composer.json
+++ b/composer.json
@@ -21,12 +21,12 @@
     "require": {
         "php": ">=7.2",
         "swoole/ide-helper": "@dev",
-        "ext-mbstring": "*",
         "swlib/saber": "^1.0",
         "doctrine/annotations": "~1.10",
         "ext-json": "*",
-        "ext-ctype": "*",
-        "psy/psysh": "@stable"
+        "psy/psysh": "@stable",
+        "symfony/polyfill-ctype": "^1.20",
+        "symfony/polyfill-mbstring": "^1.20"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/Framework/FrameworkLoader.php b/src/Framework/FrameworkLoader.php
index 3f4377dc..fec6a6f6 100644
--- a/src/Framework/FrameworkLoader.php
+++ b/src/Framework/FrameworkLoader.php
@@ -190,9 +190,9 @@ class FrameworkLoader
         if (version_compare(SWOOLE_VERSION, "4.4.13") == -1) die("You must install swoole version >= 4.4.13 !");
         //if (!extension_loaded("gd")) die("Can not find gd extension.\n");
         //if (!extension_loaded("sockets")) die("Can not find sockets extension.\n");
-        if (!extension_loaded("ctype")) die("Can not find ctype extension.\n");
+        if (!function_exists("ctype_alpha")) die("Can not find ctype extension.\n");
         if (!function_exists("mb_substr")) die("Can not find mbstring extension.\n");
-        if (substr(PHP_VERSION, 0, 1) != "7") die("PHP >=7 required.\n");
+        if (substr(PHP_VERSION, 0, 1) < "7") die("PHP >=7 required.\n");
         //if (!function_exists("curl_exec")) die("Can not find curl extension.\n");
         //if (!class_exists("ZipArchive")) die("Can not find Zip extension.\n");
         //if (!file_exists(CRASH_DIR . "last_error.log")) die("Can not find log file.\n");