diff --git a/composer.json b/composer.json
index 521e9e1..917d6c1 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
     "description": "PHP client library for Flickr.",
     "require": {
         "php": ">=5.3.0",
-        "ext-curl": "0"
+        "ext-curl": ">=7.0.0"
     },
     "autoload": {
         "psr-0": {