diff --git a/composer.json b/composer.json
index c87bd19..8a1bc14 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,8 @@
     }
   ],
   "require": {
-    "php": "^7.0"
+    "php": "^7.0",
+    "ext-curl": "*"
   },
   "require-dev": {
     "phpunit/phpunit": "^6.1"