diff --git a/fluent-plugin-flatten-hash.gemspec b/fluent-plugin-flatten-hash.gemspec
index 9e5e426..54ba30c 100644
--- a/fluent-plugin-flatten-hash.gemspec
+++ b/fluent-plugin-flatten-hash.gemspec
@@ -4,7 +4,7 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
 Gem::Specification.new do |spec|
   spec.name          = "fluent-plugin-flatten-hash"
-  spec.version       = "0.1.0"
+  spec.version       = "0.2.0"
   spec.authors       = ["Masahiro Sano"]
   spec.email         = ["sabottenda@gmail.com"]
   spec.description   = %q{A fluentd plugin to flatten nested hash structure as a flat record}