diff --git a/composer.json b/composer.json
index cbff429..9a0f0f7 100644
--- a/composer.json
+++ b/composer.json
@@ -4,6 +4,7 @@
   "keywords": ["php curl client"],
   "license": "MIT",
   "require": {
+    "php": "^7.3|^8.0",
     "ext-curl": "*",
     "ext-json": "*"
   },