diff --git a/composer.json b/composer.json
index 57ec6ec..eab4731 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
     "require": {
         "php": ">=5.3",
         "swiftmailer/swiftmailer" : "~5.0, >=4.0",
-        "mailgun/mailgun-php" : ">=1.7"
+        "mailgun/mailgun-php" : "~1.7"
     },
     "suggest": {
         "azine/mailgunwebhooks-bundle": "Allows to handle Mailgun event webhooks"