diff --git a/composer.json b/composer.json
index a90d1dd..c5ac2f4 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,7 @@
   },
   "require": {
     "php": "^5.6 || ^7.1",
-    "code-tool/curl-client": "^1.6 || ^4",
+    "code-tool/curl-client": "<=1.6 || ^3",
     "symfony/config": "^2.6 || ^3.4 || ^4",
     "symfony/http-kernel": "^2.6 || ^3.4 || ^4",
     "symfony/dependency-injection": "^2.6 || ^3.4 || ^4"