diff --git a/composer.json b/composer.json
index caf6c7ee..c739abda 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,10 @@
     ],
     "require": {
         "php": ">=7.1.0",
-        "topthink/think-installer": "~1.0"
+        "topthink/think-installer": "~1.0",
+        "ext-fileinfo": "*",
+        "ext-mbstring": "*",
+        "ext-json": "*"
     },
     "require-dev": {
         "phpunit/phpunit": "4.8.*",