diff --git a/README.md b/README.md
index 871b81b..16d287f 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ To begin using this SDK, you will first need to download it to your machine. We
 Add this line to your application's Gemfile:
 
 ```ruby
-gem 'dwolla_v2', '~> 3.1'
+gem 'dwolla_v2', '~> 4.0'
 ```
 
 And then execute: