diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..334d47e
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,5 @@
+## 0.2.1 - 2016-01-06
+
+- Logging API request/response [#5](https://github.com/treasure-data/embulk-output-mailchimp/pull/5)
+- Default `double_optin` to be `false` [#6](https://github.com/treasure-data/embulk-output-mailchimp/pull/6)
+- Fixed when non-string groups given [#7](https://github.com/treasure-data/embulk-output-mailchimp/pull/7)
diff --git a/embulk-output-mailchimp.gemspec b/embulk-output-mailchimp.gemspec
index b121891..9967171 100644
--- a/embulk-output-mailchimp.gemspec
+++ b/embulk-output-mailchimp.gemspec
@@ -1,7 +1,7 @@
 
 Gem::Specification.new do |spec|
   spec.name          = "embulk-output-mailchimp"
-  spec.version       = "0.2.0"
+  spec.version       = "0.2.1"
   spec.authors       = ["uu59", "takkanm"]
   spec.summary       = "Mailchimp output plugin for Embulk"
   spec.description   = "Dumps records to Mailchimp."