diff --git a/cluster/addons/fluentd-elasticsearch/fluentd-es-image/Gemfile b/cluster/addons/fluentd-elasticsearch/fluentd-es-image/Gemfile
index 52b668b6ac4..dd617eafc3f 100644
--- a/cluster/addons/fluentd-elasticsearch/fluentd-es-image/Gemfile
+++ b/cluster/addons/fluentd-elasticsearch/fluentd-es-image/Gemfile
@@ -8,4 +8,5 @@ gem 'fluent-plugin-systemd', '~>1.0.1'
 gem 'fluent-plugin-detect-exceptions', '~>0.0.11'
 gem 'fluent-plugin-prometheus', '~>1.0.1'
 gem 'fluent-plugin-multi-format-parser', '~>1.0.0'
+gem 'fluent-plugin-concat', '~>2.3.0'
 gem 'oj', '~>3.6.5'