diff --git a/ChangeLog b/ChangeLog
index ba9ace0..09839b3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Release 2.2.2 - 2026/03/27
+
+	* in_prometheus: fix: Add IPv6 support for bind parameter (#240)
+
 Release 2.2.1 - 2025/03/24
 
 	* in_prometheus_tail_monitor: Add throttling metrics as `fluentd_tail_file_throttled`. (GitHub#227)
diff --git a/fluent-plugin-prometheus.gemspec b/fluent-plugin-prometheus.gemspec
index b2e9b86..7e96d54 100644
--- a/fluent-plugin-prometheus.gemspec
+++ b/fluent-plugin-prometheus.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |spec|
   spec.name          = "fluent-plugin-prometheus"
-  spec.version       = "2.2.1"
+  spec.version       = "2.2.2"
   spec.authors       = ["Masahiro Sano"]
   spec.email         = ["sabottenda@gmail.com"]
   spec.summary       = %q{A fluent plugin that collects metrics and exposes for Prometheus.}