diff --git a/docker/estenrye/fluentd-cloudtrail/Gemfile b/docker/estenrye/fluentd-cloudtrail/Gemfile
index b32bff01..6ed130e2 100644
--- a/docker/estenrye/fluentd-cloudtrail/Gemfile
+++ b/docker/estenrye/fluentd-cloudtrail/Gemfile
@@ -12,7 +12,7 @@ gem "async-http", "= 0.56.5"
 
 gem "ext_monitor", "= 0.1.2"
 
-gem "fluentd", "= 1.14.6"
+gem "fluentd", "= 1.15.2"
 
 gem "bigdecimal", "= 3.1.2"
 
diff --git a/docker/estenrye/fluentd-cloudtrail/Gemfile.lock b/docker/estenrye/fluentd-cloudtrail/Gemfile.lock
index fc50b6c9..4144d668 100644
--- a/docker/estenrye/fluentd-cloudtrail/Gemfile.lock
+++ b/docker/estenrye/fluentd-cloudtrail/Gemfile.lock
@@ -92,12 +92,12 @@ GEM
       aws-sdk-s3 (~> 1.60)
       aws-sdk-sqs (~> 1.23)
       fluentd (>= 0.14.22, < 2)
-    fluentd (1.14.6)
+    fluentd (1.15.2)
       bundler
       cool.io (>= 1.4.5, < 2.0.0)
       http_parser.rb (>= 0.5.1, < 0.9.0)
       msgpack (>= 1.3.1, < 2.0.0)
-      serverengine (>= 2.2.5, < 3.0.0)
+      serverengine (>= 2.3.0, < 3.0.0)
       sigdump (~> 0.2.2)
       strptime (>= 0.2.4, < 1.0.0)
       tzinfo (>= 1.0, < 3.0)
@@ -145,7 +145,7 @@ DEPENDENCIES
   fluent-plugin-elasticsearch (= 5.2.4)
   fluent-plugin-record_splitter (= 0.2.1)
   fluent-plugin-s3 (= 1.6.1)
-  fluentd (= 1.14.6)
+  fluentd (= 1.15.2)
   json (= 2.6.1)
   oj (= 3.13.11)