diff --git a/CHANGELOG.md b/CHANGELOG.md
index bfdfec9..5889825 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+# 0.2.1 - 2025-08-22
+
+* Relax log level (#6)
+* Use :cmd backend for Windows platform (#4)
+* gemspec: move development dependencies to Gemfile (#3)
+
 # 0.2.0 - 2025-07-14
 
 * Make robust for future distribution release
diff --git a/fluent-plugin-fluent-package-update-notifier.gemspec b/fluent-plugin-fluent-package-update-notifier.gemspec
index c52a817..8f900ab 100644
--- a/fluent-plugin-fluent-package-update-notifier.gemspec
+++ b/fluent-plugin-fluent-package-update-notifier.gemspec
@@ -3,7 +3,7 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
 Gem::Specification.new do |spec|
   spec.name    = "fluent-plugin-fluent-package-update-notifier"
-  spec.version = "0.2.0"
+  spec.version = "0.2.1"
   spec.authors = ["Kentaro Hayashi"]
   spec.email   = ["hayashi@clear-code.com"]