diff --git a/composer.json b/composer.json
index 8c0ed89e..27d4bc88 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
         "symfony/console": "~2.3|~3.0",
         "symfony/dependency-injection": "~2.3|~3.0",
         "doctrine/dbal": "~2.3",
-        "iron-io/iron_mq": "~1.4",
+        "iron-io/iron_mq": "~1.4 || ~4.0",
         "aws/aws-sdk-php": "~2.4|~3.0",
         "pda/pheanstalk": "~3.0",
         "league/container": "~1.0",