diff --git a/jekyll-theme-classless-simple.gemspec b/jekyll-theme-classless-simple.gemspec
index 1b49374..3b35b70 100644
--- a/jekyll-theme-classless-simple.gemspec
+++ b/jekyll-theme-classless-simple.gemspec
@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |spec|
   spec.name          = "jekyll-theme-classless-simple"
-  spec.version       = "0.3.0"
+  spec.version       = "0.4.0"
   spec.authors       = ["toshimaru"]
   spec.email         = ["me@toshimaru.net"]