Gemfile in libnotify-0.3.0 vs Gemfile in libnotify-0.4.0

@@ -3,8 +3,8 @@
 gem "ffi", ">= 0.6.2"
 
 group :test do
   gem "jeweler"
   gem "riot", "= 0.11.2"
-  gem "riot_notifier", ">= 0.2.0"
+  gem "riot_notifier", "~> 0.4.0"
   gem "yard"
 end