diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9a7f575..c6e771f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+# Release v0.9.1 - 2024/02/17
+
+* Relax required Nokogiri version (#117)
+  This change permit 1.16 or later version of Nokogiri.
+
 # Release v0.9.0 - 2024/08/02
 * in_windows_eventlog2: Enable expanding user names from SID and add `preserve_sid_on_hash` option
 * in_windows_eventlog2: Add Delimiter and Casing options for parsing
diff --git a/fluent-plugin-winevtlog.gemspec b/fluent-plugin-winevtlog.gemspec
index bf08eba..a42c865 100644
--- a/fluent-plugin-winevtlog.gemspec
+++ b/fluent-plugin-winevtlog.gemspec
@@ -4,7 +4,7 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
 Gem::Specification.new do |spec|
   spec.name          = "fluent-plugin-windows-eventlog"
-  spec.version       = "0.9.0"
+  spec.version       = "0.9.1"
   spec.authors       = ["okahashi117", "Hiroshi Hatake", "Masahiro Nakagawa"]
   spec.email         = ["naruki_okahashi@jbat.co.jp", "cosmo0920.oucc@gmail.com", "repeatedly@gmail.com"]
   spec.summary       = %q{Fluentd Input plugin to read windows event log.}