diff --git a/README.md b/README.md
index cf4abdb..12b19fe 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ composer and the Mailgun SDK.
 curl -sS https://getcomposer.org/installer | php
 
 # Add Mailgun as a dependency
-php composer.phar require mailgun/mailgun-php:~1.4
+php composer.phar require mailgun/mailgun-php:~1.5
 ``` 
 
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