diff --git a/composer.json b/composer.json
index 431acb8..8d1df9c 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
   "require": {
     "php": ">=5.3.3",
     "zendframework/zend-servicemanager": "2.*",
-    "zfr/zfr-mailchimp": "~1.0"
+    "zfr/zfr-mailchimp": "1.0.0-beta1"
   },
   "autoload": {
     "psr-0": {