diff --git a/README.md b/README.md
index 6fd6b3c..1abc8c8 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ Allows to create email templates without mess.
 Add to Gemfile:
 
 ```ruby
-gem 'mjml-ruby', '~> 0.3', require: 'mjml'
+gem 'mjml-ruby', '~> 0.4', require: 'mjml'
 ```
 
 or
diff --git a/lib/mjml/version.rb b/lib/mjml/version.rb
index 4064d4a..450010b 100644
--- a/lib/mjml/version.rb
+++ b/lib/mjml/version.rb
@@ -1,3 +1,3 @@
 module MJML
-  VERSION = '0.3.6'.freeze
+  VERSION = '0.4.0'.freeze
 end